FAILED ATTEMPT - just committing everything 5 months after losing my sanity.

.clang-tidy

@@ -20,7 +20,9 @@ Checks: >
   -llvm-*,
   -llvmlibc-*,
   misc-*,
+  -misc-non-private-member-variables-in-classes,
   modernize-*,
+  -modernize-use-auto,
   -modernize-use-trailing-return-type,
   -modernize-use-nodiscard,
   -mpi-*,
@@ -29,4 +31,7 @@ Checks: >
   performance-*,
   portability-*,
   readability-*,
+  -readability-function-cognitive-complexity,
+  -readability-implicit-bool-conversion,
+  -readability-named-parameter,
   -zircon-*,

.gitignore

@@ -3,8 +3,14 @@
 *.d
 *.swp
 *~
+*.dSYM
 ws
 unittests
 local.conf
 build/
 /.idea/
+/test/test_nr1
+/examples/libc99/libc99.so
+/test/test_identity
+/test/.pEp/
+/test/test_sleeve

Makefile

@@ -5,16 +5,17 @@
 
 .PHONY: all src test install uninstall clean
 
-all: src
+#all: src test
+all: test
 
-src:
-	$(MAKE) -C src
+#src:
+#	$(MAKE) -C src
 
-test: src
+test:
 	$(MAKE) -C test
 
 clean:
-	$(MAKE) -C src clean
+#	$(MAKE) -C src clean
 	$(MAKE) -C test clean
 
 install:

Makefile.conf

@@ -34,3 +34,5 @@ else
 endif
 
 CXXFLAGS+=-I$(PREFIX)/include
+LDFLAGS+=-L$(PREFIX)/lib
+

examples/libc99/libc99.c

@@ -0,0 +1,204 @@
+#include "libc99.h"
+#include <stdlib.h>
+#include <string.h>
+
+C99_C* c99_C_new()
+{
+    C99_C* ret = calloc(1, sizeof(C99_C));
+    return ret;
+}
+
+void c99_C_free(C99_C* c)
+{
+    if (c) {
+        free(c->pi);
+        free(c);
+    }
+}
+
+C99_B* c99_B_new()
+{
+    C99_B* result = calloc(1, sizeof(C99_B));
+    return result;
+}
+
+void c99_B_free(C99_B* b)
+{
+    if (b) {
+        c99_C_free(b->c);
+        free(b);
+    }
+}
+
+C99_A* c99_A_new()
+{
+    C99_A* result = calloc(1, sizeof(C99_A));
+    return result;
+}
+
+void c99_A_free(C99_A* a)
+{
+    if (a) {
+        c99_B_free(a->b);
+        c99_A_free(a);
+    }
+}
+
+
+// -------------------------------------------------------------------------------------------------
+// USE
+// ---
+// dont do anything
+C99_Status c99_use_basic(int basic)
+{
+    return OK;
+}
+C99_Status c99_use_struct(const C99_A* a)
+{
+    if (!a) {
+        return ERROR;
+    }
+    return OK;
+}
+C99_Status c99_use_string(const char* c_str)
+{
+    if (!c_str) {
+        return ERROR;
+    }
+    return OK;
+}
+
+
+// SUPPLY
+// ------
+// modify value
+C99_Status c99_supply_basic(int* basic)
+{
+    if (!basic) {
+        return ERROR;
+    }
+
+    *basic *= 2;
+    return OK;
+}
+
+// modify struct elem
+// Replace object in a struct
+C99_Status c99_supply_struct(C99_A* a)
+{
+    // validate input
+    if (!a) {
+        return ERROR;
+    }
+    if (!a->b) {
+        return ERROR;
+    }
+    if (!a->b->c) {
+        return ERROR;
+    }
+    if (!a->b->c->pi) {
+        return ERROR;
+    }
+
+    // get current value
+    int curr_val = *(a->b->c->pi);
+    // calculate new value
+    int new_val = curr_val * 2;
+
+    // replace with new object
+    c99_B_free(a->b);
+    a->b = c99_B_new();
+    a->b->c = c99_C_new();
+    a->b->c->pi = calloc(1, sizeof(int));
+    *a->b->c->pi = new_val;
+
+    return OK;
+}
+
+// prepend pEp
+C99_Status c99_supply_string(char** c_str)
+{
+    if (!c_str) {
+        return ERROR;
+    }
+    if (!*c_str) {
+        return ERROR;
+    }
+
+    char pEp[] = "pEp";
+    size_t pEp_len = strlen(pEp);
+    size_t c_str_len = strlen(*c_str);
+    char* new_str = (char*)malloc(c_str_len + pEp_len);
+    memcpy(new_str, pEp, pEp_len);
+    memcpy(new_str + pEp_len, *c_str, c_str_len);
+    free(*c_str);
+    c_str = &new_str;
+    return OK;
+}
+
+// PROVIDE
+// -------
+// dont do anything
+C99_Status c99_provide_basic(int basic)
+{
+    return OK;
+}
+
+// use and free the struct
+C99_Status c99_provide_struct(C99_A* a)
+{
+    if (!a) {
+        return ERROR;
+    }
+    c99_A_free(a);
+    return OK;
+}
+
+// use and free the string
+C99_Status c99_provide_string(char* c_str)
+{
+    if (!c_str) {
+        return ERROR;
+    }
+    free(c_str);
+    return OK;
+}
+
+// RETURN
+// ------
+// create a new instance and return it
+C99_Status c99_return_basic(int** basic)
+{
+    if (!basic) {
+        return ERROR;
+    }
+    *basic = NULL;
+    int* new_basic = calloc(1, sizeof(int));
+    *basic = new_basic;
+    return OK;
+}
+
+// create a new instance and return it
+C99_Status c99_return_struct(C99_A** a)
+{
+    if (!a) {
+        return ERROR;
+    }
+    *a = NULL;
+    C99_A* new_a = c99_A_new();
+    *a = new_a;
+    return OK;
+}
+
+// create a new instance and return it
+C99_Status c99_return_string(char** c_str)
+{
+    if (!c_str) {
+        return ERROR;
+    }
+
+    *c_str = NULL;
+    char* new_str = strdup("pEp");
+    *c_str = new_str;
+    return OK;
+}

examples/libc99/libc99.h

@@ -0,0 +1,93 @@
+// We are testing wrappers for the c-datatypes:
+// * integral e.g (int) here
+// * enum
+// * c-string
+// * struct
+// Those are all considered POD-types
+#ifndef LIBPEPDATATYPES_LIBC99_H
+#define LIBPEPDATATYPES_LIBC99_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+    typedef enum
+    {
+        OK,
+        ERROR
+    } C99_Status;
+
+    typedef enum
+    {
+        ONE,
+        TWO,
+        THREE
+    } C99_Enum;
+
+
+    typedef struct {
+        int i;
+        int* pi;
+    } C99_C;
+    C99_C* c99_C_new();
+    void c99_C_free(C99_C* c);
+
+    typedef struct {
+        C99_C* c;
+    } C99_B;
+    C99_B* c99_B_new();
+    void c99_B_free(C99_B* b);
+
+
+    typedef struct {
+        C99_B* b;
+    } C99_A;
+    C99_A* c99_A_new();
+    void c99_A_free(C99_A* a);
+
+
+    // calling conventions
+    // -------------------
+    // use
+    // readonly in parm, ownership remains with caller
+    // create/own a full instance -> operator const T*()
+    // const T* / T
+    C99_Status c99_use_basic(int basic);
+    C99_Status c99_use_struct(const C99_A* a);
+    C99_Status c99_use_string(const char* c_str);
+
+    // supply
+    // inout parm, ownership remains with caller
+    // the function changes the value of the object, but not the object itself
+    // create/own a full instance -> operator T*
+    // T*
+    C99_Status c99_supply_basic(int* basic);
+    C99_Status c99_supply_struct(C99_A* a);
+    // Not valid
+    //    C99_Status c99_supply_string(char** c_str);
+
+    // provide
+    // in parm, ownership goes to callee
+    // same as 'use', but ownership goes to callee
+    // create/own a full instance -> release ownership -> operator T*
+    // T / T* (release ownership)
+    C99_Status c99_provide_basic(int basic);
+    C99_Status c99_provide_struct(C99_A* a);
+    C99_Status c99_provide_string(char* c_str);
+
+    // return
+    // out parm, ownership goes to caller
+    // T** will not be freed by the function,
+    // create/own an empty instance -> operator T**
+    // T** (must not point to mem which has to be freed first)
+    C99_Status c99_return_basic(int** basic);
+    C99_Status c99_return_struct(C99_A** a);
+    C99_Status c99_return_string(char** c_str);
+
+    // create
+    // factory delivers this, ownership goes to caller
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

examples/libc99/makefile

@@ -0,0 +1,27 @@
+LIB_STATIC=libc99.a
+LIB_DYN=libc99.so
+
+CFLAGS+=-std=c99 -g -UNDEBUG
+
+SRCS+=$(wildcard *.c)
+OBJS_C+=$(SRCS:.c=.o)
+
+.PHONY: all lib_static lib_dyn clean
+
+all: lib_static lib_dyn
+
+lib_static: $(LIB_STATIC)
+
+lib_dyn: $(LIB_DYN)
+
+$(LIB_STATIC): $(OBJS_C)
+	$(AR) -rc $@ $^
+
+$(LIB_DYN): $(OBJS_C)
+	$(CC) $(CFLAGS) -shared -o $@ $^
+
+clean:
+	rm -f $(LIB_STATIC)
+	rm -f $(LIB_DYN)
+	rm -f $(OBJS_C)
+

src/POTS.hh

@@ -0,0 +1,897 @@
+#include <iostream>
+#include <cctype>
+#include <utility>
+#include <pEp/utils.hh>
+#include <pEp/pEpLog.hh>
+#include <pEp/inspect.hh>
+#include <type_traits>
+#include <map>
+#include <optional>
+#include "../examples/libc99/libc99.h"
+
+#ifndef LIBPEPADAPTER_POTS_HH
+    #define LIBPEPADAPTER_POTS_HH
+
+// TODO: this needs to go
+using namespace pEp;
+
+
+// Python Overlay Type System
+
+
+namespace POTS {
+    class BasicSleeve;
+    bool operator==(const BasicSleeve& a, const BasicSleeve& b);
+    bool operator!=(const BasicSleeve& a, const BasicSleeve& b);
+
+    //---------------------------------------------------------------------------------------------
+    class BasicSleeve {
+    public:
+        BasicSleeve() = default;
+
+        // Create as a member
+        BasicSleeve(const std::string& name, BasicSleeve& parent) : _name{ name }, _parent{ parent }
+        {
+            _parent.value().get().add_member(*this);
+        }
+
+        BasicSleeve(const BasicSleeve& rhs, BasicSleeve& parent) :
+            _name{ rhs._name },
+            _parent(parent)
+        {
+            _parent.value().get().add_member(*this);
+        }
+
+        BasicSleeve(const BasicSleeve& rhs) : _name{ rhs._name } {}
+
+        // Add a member
+        void add_member(BasicSleeve& member)
+        {
+            try {
+                _members.insert(
+                    std::pair<std::string, BasicSleeve&>(member.get_name().value(), member));
+            } catch (const std::bad_optional_access& e) {
+                throw std::runtime_error("cant add member without a name");
+            }
+        }
+
+        // leave parent
+        void remove_member(BasicSleeve& member)
+        {
+            try {
+                _members.erase(_members.find(member.get_name().value()));
+            } catch (const std::bad_optional_access& e) {
+                throw std::runtime_error("remove_member - cant remove member without a name");
+            } catch (...) {
+                throw std::runtime_error("remove_member - unknown error");
+            }
+        }
+
+        virtual BasicSleeve& operator=(const BasicSleeve& rhs)
+        {
+            pEpLog("called");
+            if (_members.empty()) {
+                throw std::runtime_error("struct has no members");
+            }
+
+            for (std::pair<std::string, BasicSleeve&> member : _members) {
+                try {
+                    BasicSleeve& other = rhs._members.at(member.first);
+                    member.second = other;
+                } catch (const std::out_of_range& e) {
+                    throw std::runtime_error("ASSFSD");
+                }
+            }
+            return *this;
+        }
+
+
+        virtual bool cmp(const BasicSleeve& rhs) const
+        {
+            if (_members.empty()) {
+                throw std::runtime_error("struct has no members");
+            }
+
+            for (std::pair<std::string, BasicSleeve&> member : _members) {
+                try {
+                    BasicSleeve& other = rhs._members.at(member.first);
+                    if (other != member.second) {
+                        return false;
+                    }
+                } catch (const std::out_of_range& e) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+        virtual void leave_ownership_recurse()
+        {
+            for (std::pair<std::string, BasicSleeve&> member : _members) {
+                member.second.leave_ownership_recurse();
+            }
+        }
+
+        virtual void rebind()
+        {
+            for (std::pair<std::string, BasicSleeve&> member : _members) {
+                member.second.rebind();
+            }
+        }
+
+        virtual std::string to_string(int indent = 0) const
+        {
+            std::stringstream ss{};
+            for (std::pair<std::string, BasicSleeve&> member : _members) {
+                ss << member.second.to_string(indent);
+            }
+            return ss.str();
+        }
+
+        virtual std::string repr(int indent = 0) const
+        {
+            std::stringstream ss{};
+            for (std::pair<std::string, BasicSleeve&> member : _members) {
+                ss << member.second.repr(indent);
+            }
+            return ss.str();
+        }
+
+        std::optional<std::string> get_name()
+        {
+            return _name;
+        }
+
+        virtual ~BasicSleeve()
+        {
+            try {
+                if (_parent) {
+                    _parent.value().get().remove_member(*this);
+                }
+            } catch (...) {
+                //TODO:
+                // haha sth went wrong and you have no idea....
+            }
+        }
+
+    protected:
+        std::optional<std::string> _name{};
+        std::optional<std::reference_wrapper<BasicSleeve>> _parent{};
+        std::map<std::string, BasicSleeve&> _members{};
+    };
+
+
+    //    template<typename T, class Enable = void>
+    //    class Sleeve;
+
+    //---------------------------------------------------------------------------------------------
+    // VALUE
+    //---------------------------------------------------------------------------------------------
+    template<typename T>
+    class Sleeve {
+        //    class Sleeve<T, typename std::enable_if<std::is_fundamental<T>::value || std::is_enum<T>::value || std::is_class<T>::value>::type>
+        //        : public BasicSleeve {
+
+    public:
+        using ResolverFunc = std::function<T*()>;
+        // Creation
+        // --------
+        Sleeve() = delete;
+
+        // Create a hosting sleeve
+        explicit Sleeve(const T& val) :
+            _target_resolver{ [this]() { return &_hosted_obj; } },
+            _hosted_obj(val)
+        {
+            pEpLogClass("hosting sleeve");
+        }
+
+        //        // create a static sleeve
+        //        // using static binding to an existing object
+        //        explicit Sleeve(T* target) : _effective_resolver{ [target]() { return target; } }
+        //        {
+        //            pEpLogClass("static sleeve");
+        //        }
+
+        // create a dynamic sleeve
+        // using dynamic binding (to a per-access determined object using the custom resolver)
+        explicit Sleeve(ResolverFunc target_resolver) :
+            _target_resolver{ std::move(target_resolver) }
+        {
+            pEpLogClass("dynamic sleeve");
+        }
+
+        // create a dynamic sleeve
+        // using dynamic binding (to a per-access determined object using the custom target_resolver)
+        //        explicit Sleeve(BasicSleeve& parent, ResolverFunc target_resolver) :
+        //            BasicSleeve(parent),
+        //            _effective_resolver{ std::move(target_resolver) }
+        //        {
+        //            pEpLogClass("dynamic sleeve");
+        //        }
+
+        // copy
+        // copy constructor will always create a hosting sleeve
+        explicit Sleeve(const Sleeve<T>& rhs) :
+            _target_resolver{ [this]() { return &_hosted_obj; } },
+            _hosted_obj{ rhs.obj() }
+        {
+            pEpLogClass("copy ctor");
+        }
+
+        // Assignment
+        // ----------
+        // takes a copy
+        Sleeve<T>& operator=(const Sleeve<T>& rhs)
+        {
+            pEpLogClass("called");
+            *target() = const_cast<Sleeve<T>&>(rhs).obj();
+            return *this;
+        }
+
+        // takes a copy
+        Sleeve<T>& operator=(const T& rhs)
+        {
+            pEpLogClass("called");
+            *target() = rhs;
+            return *this;
+        }
+
+        // Comparison
+        // ----------
+        // value comparison
+
+        //        virtual bool operator==(const BasicSleeve& rhs) const override
+        bool operator==(const Sleeve<T>& rhs) const
+        {
+            pEpLogClass("called");
+            return _this()->obj() == const_cast<Sleeve<T>&>(rhs).obj();
+        }
+
+        bool operator==(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return _this()->obj() == rhs;
+        }
+
+        bool operator!=(const Sleeve<T>& rhs) const
+        {
+            pEpLogClass("called");
+            return !operator==(rhs);
+        }
+
+        bool operator!=(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return !operator==(rhs);
+        }
+
+        // object comparison
+        bool is(const Sleeve<T>& rhs) const
+        {
+            pEpLogClass("called");
+            return id() == rhs.id();
+        }
+
+        bool is(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return _this()->target() == &rhs;
+        }
+
+        // Accessors
+        // ---------
+
+        // Access the object data r/w
+        operator T() const
+        {
+            pEpLogClass("called");
+            return obj();
+        }
+
+        // Access the object data r/w
+        T obj() const
+        {
+            pEpLogClass("called");
+            return *(_this()->target());
+        }
+
+        // Access the object pointer r/w
+        T* target()
+        {
+            //            pEpLogClass("called");
+            return _target_resolver();
+        }
+
+        // Misc
+        // ----
+        // obj_pointer as id
+        uintptr_t id() const
+        {
+            return reinterpret_cast<uintptr_t>(_this()->target());
+        }
+
+        std::string to_string() const //override
+        {
+            int indent = 0;
+            std::stringstream builder;
+            builder << std::endl;
+            builder << std::string(indent, '\t') << "{" << std::endl;
+            indent++;
+            builder << std::string(indent, '\t') << "this       : " << CXX::Inspect::all(_this())
+                    << std::endl;
+            builder << std::string(indent, '\t')
+                    << "target    : " << CXX::Inspect::all(_this()->target()) << std::endl;
+            builder << std::string(indent, '\t')
+                    << "_hosted_obj: " << CXX::Inspect::all(_this()->obj()) << std::endl;
+
+            indent--;
+            builder << std::string(indent, '\t') << "}";
+            return builder.str();
+        }
+
+        //        static bool log_enabled;
+        Adapter::pEpLog::pEpLogger logger{ typeid(T).name(), true };
+
+    protected:
+        Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
+
+        ResolverFunc _target_resolver;
+        T _hosted_obj;
+
+    private:
+        Sleeve<T>* _this() const
+        {
+            return const_cast<Sleeve<T>*>(this);
+        }
+    };
+
+
+    //---------------------------------------------------------------------------------------------
+    // POINTER
+    //---------------------------------------------------------------------------------------------
+
+    template<typename T>
+    class Sleeve<T*>
+        //    class Sleeve<T*, typename std::enable_if<std::is_fundamental<T>::value || std::is_enum<T>::value || std::is_class<T>::value>::type>
+        : public BasicSleeve {
+    protected:
+        //TODO simply use T
+        using SharedPtr = std::shared_ptr<typename std::remove_pointer<T*>::type>;
+
+        using AllocFunc = std::function<T*()>;
+        using FreeFunc = std::function<void(T*)>;
+
+        const std::function<void(void*)> _deleter_bypass = [](void*) {};
+
+    public:
+        using ResolverFunc = std::function<T**()>;
+
+
+        // -----------------------------------------------------------------------------------------
+        // Creation
+
+
+        // Hosting Sleeve Constructor - Create a hosting sleeve
+        // unitialized
+        explicit Sleeve() :
+            _target_resolver{ [this]() { return &_hosted_obj; } },
+            _hosted_obj{ _effective_alloc() },
+            _sptr{ obj(), _deleter_bypass }
+        {
+            pEpLogClass("hosting sleeve");
+        }
+
+        // Hosting Sleeve Constructor - Create a hosting sleeve
+        // initialized
+        //        explicit Sleeve(const T& val) : Sleeve()
+        //        {
+        //            pEpLogClass("hosting sleeve (initialized)");
+        //            this->operator=(val);
+        //        }
+
+        // create a static sleeve
+        // using static binding to object pointer
+        //        explicit Sleeve(T** target) :
+        //            _target_resolver{ [target]() { return target; } },
+        //            _hosted_obj{ nullptr },
+        //            _sptr{ obj(), _deleter_bypass }
+        //        {
+        //            pEpLogClass("static sleeve");
+        //        }
+
+        // Binding Sleeve Constructor - create a dynamic sleeve
+        // using dynamic binding (to a per-access determined object pointer using the custom target resolver)
+        explicit Sleeve(ResolverFunc target_resolver) :
+            _target_resolver{ std::move(target_resolver) },
+            _hosted_obj{ nullptr },
+            _sptr{ obj(), _deleter_bypass }
+        {
+            pEpLogClass("binding sleeve");
+        }
+
+        // Member Binding Sleeve Constructor - create a dynamic sleeve
+        // using dynamic binding (to a per-access determined object pointer using the custom resolver)
+        explicit Sleeve(const std::string& name, BasicSleeve& parent, ResolverFunc target_resolver) :
+            BasicSleeve(name, parent),
+            _target_resolver{ std::move(target_resolver) },
+            _hosted_obj{ nullptr },
+            _sptr{ obj(), _deleter_bypass }
+        {
+            pEpLogClass("member binding sleeve");
+        }
+
+        //        const AllocFunc _effective_alloc{ std::bind(&Sleeve::_default_alloc, this) };
+        //        const FreeFunc _effective_free{
+        //            std::bind(&Sleeve::_default_free, this, std::placeholders::_1)
+        //        };
+        //        const ResolverFunc _target_resolver{ nullptr };
+        //
+        //        bool _is_owning{ true };
+        //        T* _hosted_obj{ nullptr };
+        //        SharedPtr _sptr{ nullptr };
+
+        // copy
+        // copy constructor will always create a hosting sleeve
+//        explicit Sleeve(const Sleeve<T*>& rhs) :
+//            BasicSleeve(rhs),
+//            _effective_alloc{ std::bind(&Sleeve::_default_alloc, this) },
+//            _effective_free{
+//                std::bind(&Sleeve::_default_free, this, std::placeholders::_1)
+//            }, _target_resolver{ [this]() { return &_hosted_obj; } },
+//            _hosted_obj{ _effective_alloc() },
+//            _sptr{ obj(), _deleter_bypass }
+//        {
+//            pEpLogClass("copy ctor");
+//        }
+
+
+        // -----------------------------------------------------------------------------------------
+        // Assignment
+
+        Sleeve<T*>& operator=(const Sleeve<T*>& rhs)
+        {
+            pEpLogClass("called");
+            if constexpr (std::is_class<T>::value) {
+                BasicSleeve::operator=(rhs);
+            }
+
+            // replace own object
+            leave_ownership();
+            _sptr = rhs._sptr;
+            *target() = _sptr.get();
+            return *this;
+        }
+
+        // DYN TYPED ASSIGN ;p)
+        // replace the object (managed)
+        // take copy of the shared_ptr
+        Sleeve<T*>& operator=(const BasicSleeve& rhs) override
+        {
+            pEpLogClass("called");
+            try {
+                // try to cast rhs to own type
+                const Sleeve<T*>& rhs_c = dynamic_cast<const Sleeve<T*>&>(rhs);
+                operator=(rhs_c);
+            } catch (...) {
+                throw std::runtime_error("INVALID TYPES");
+            }
+            return *this;
+        }
+
+
+        // replace the value
+        //        Sleeve<T*>& operator=(T* rhs)
+        //        {
+        //            pEpLogClass("called");
+        //            leave_ownership();
+        //
+        //            _sptr = SharedPtr{ rhs, _deleter_bypass };
+        //            *target() = rhs;
+        //
+        //            if constexpr (std::is_class<T>::value) {
+        //                //rebind
+        //            }
+        //
+        //            return *this;
+        //        }
+
+        // replace the value
+        // deep-copy
+        // if empty, create a new instance on the target
+        Sleeve<T*>& operator=(const T& rhs)
+        {
+            pEpLogClass("called");
+            // only members leave ownership
+            if constexpr (std::is_class<T>::value) {
+                BasicSleeve::leave_ownership_recurse();
+            }
+
+            // if empty, create a new obj
+            if (is_empty()) {
+                pEpLogClass("creating new instance");
+                *target() = _effective_alloc();
+                _sptr = SharedPtr{ obj(), _deleter_bypass };
+            }
+
+            // copy in the value
+            *obj() = rhs;
+
+            // only members rebind
+            if constexpr (std::is_class<T>::value) {
+                BasicSleeve::rebind();
+            }
+
+            return *this;
+        }
+
+        void rebind() override
+        {
+            if constexpr (std::is_class<T>::value) {
+                BasicSleeve::rebind();
+            }
+            _sptr = SharedPtr{ obj(), _deleter_bypass };
+        }
+
+        // -----------------------------------------------------------------------------------------
+        // Comparison
+
+        // value comparison
+        // must be specialized for struct types
+        bool cmp(const BasicSleeve& rhs) const override
+        {
+            //            pEpLogClass("called");
+            if constexpr (!std::is_class<T>::value) {
+                // try convert it to own type Sleeve<T>
+                try {
+                    const Sleeve<T*>& rhs_c = dynamic_cast<const Sleeve<T*>&>(rhs);
+
+                    // both have an object, lets compare values
+                    if (!is_empty() && !rhs_c.is_empty()) {
+                        return *_this()->obj() == *const_cast<Sleeve<T*>&>(rhs_c).obj();
+                    }
+                    // both have no object, they are equal
+                    if (is_empty() && rhs_c.is_empty()) {
+                        return true;
+                    }
+                    // otherwise they are not the same
+                    return false;
+                } catch (...) {
+                    return false;
+                }
+            } else {
+                return BasicSleeve::cmp(const_cast<BasicSleeve&>(rhs));
+            }
+        }
+
+        // TODO: we dont offer comparison to raw T /T*
+        // Solution: create binding sleeve of T and compare Sleeves
+        // OR: create hosting sleeve with copy of T and compare sleeves
+
+        //        bool operator==(const T* rhs) const
+        //        {
+        //            if constexpr (!std::is_class<T>::value) {
+        //                if (rhs != nullptr && !is_empty()) {
+        //                    return *_this()->obj() == *rhs;
+        //                }
+        //                if (rhs == nullptr && is_empty()) {
+        //                    return true;
+        //                }
+        //                return false;
+        //            } else {
+        //                throw std::runtime_error("cant compare raw struct types by value");
+        //            }
+        //        }
+
+        //        bool operator==(const T& rhs) const
+        //        {
+        //            pEpLogClass("called");
+        //            if constexpr (!std::is_class<T>::value) {
+        //                return *_this()->obj() == rhs;
+        //            } else {
+        //                throw std::runtime_error(
+        //                    "cant compare raw struct types by value, must be implemented in structure aware specialization");
+        //            }
+        //        }
+        //
+        //        bool operator!=(const Sleeve<T*>& rhs) const
+        //        {
+        //            pEpLogClass("called");
+        //            return !operator==(rhs);
+        //        }
+
+        bool operator!=(const T* rhs) const
+        {
+            pEpLogClass("called");
+            if constexpr (!std::is_class<T>::value) {
+                !operator==(rhs);
+            } else {
+                throw std::runtime_error(
+                    "cant compare raw struct types by value, must be implemented in structure aware specialization");
+            }
+        }
+
+        bool operator!=(const T& rhs) const
+        {
+            pEpLogClass("called");
+            if constexpr (!std::is_class<T>::value) {
+                !operator==(rhs);
+            } else {
+                throw std::runtime_error(
+                    "cant compare raw struct types by value, must be implemented in structure aware specialization");
+            }
+        }
+
+        // identity comparison
+        bool is(const Sleeve<T*>& rhs) const
+        {
+            pEpLogClass("called");
+            return id() == rhs.id();
+        }
+
+        bool is(const T* rhs) const
+        {
+            return _this()->obj() == rhs;
+        }
+
+        bool is(const T& rhs) const
+        {
+            bool ret = _this()->obj() == &rhs;
+            //TODO: is this right?
+            assert(ret == false);
+            return ret;
+        }
+
+
+        // -----------------------------------------------------------------------------------------
+        // Accessors
+
+        //        // Access value
+        operator T() const
+        {
+            pEpLogClass("called");
+            return value();
+        }
+        //
+        // Access value
+        T value() const
+        {
+            return *_this()->obj();
+        }
+
+        // Access the object data r/w
+        operator T*()
+        {
+            pEpLogClass("called");
+            return obj();
+        }
+
+        // Access the object data r/w
+        T* obj()
+        {
+            return *target();
+        }
+
+        // Access the object pointer r/w
+        T** target()
+        {
+            T** ret = _target_resolver();
+            return ret;
+        }
+
+        // -----------------------------------------------------------------------------------------
+        // Destruction
+
+        // This is the only way to decide at 'destruction-time' if the last shared_ptr has to be freed or not
+        ~Sleeve() override
+        {
+            pEpLogClass("called");
+            leave_ownership();
+        }
+
+        void leave_ownership_recurse() override
+        {
+            pEpLogClass("called");
+            if constexpr (std::is_class<T>::value) {
+                BasicSleeve::leave_ownership_recurse();
+            }
+            leave_ownership();
+        }
+
+        void leave_ownership()
+        {
+            pEpLogClass("called");
+            if (_sptr.unique()) {
+                if (_is_owning) {
+                    _effective_free(obj());
+                }
+            }
+            *target() = nullptr;
+            _sptr = nullptr;
+        }
+
+        // Misc
+        // ----
+        // object as id
+        uintptr_t id() const
+        {
+            return reinterpret_cast<uintptr_t>(_this()->obj());
+        }
+
+        void set_owner(bool is_owner)
+        {
+            _is_owning = is_owner;
+        }
+
+        bool is_bound() const
+        {
+            return _this()->target() != nullptr;
+        }
+
+        bool is_empty() const
+        {
+            return _this()->obj() == nullptr;
+        }
+
+        bool is_hosting() const
+        {
+            return &_hosted_obj == _this()->target();
+        }
+
+        std::string to_string(int indent = 0) const override // override
+        {
+            std::stringstream builder;
+            builder << std::endl;
+            builder << std::string(indent, '\t') << "{" << std::endl;
+            indent++;
+            builder << std::string(indent, '\t') << "this       : " << CXX::Inspect::all(_this())
+                    << std::endl;
+            builder << std::string(indent, '\t')
+                    << "obj        : " << CXX::Inspect::all(*_this()->target()) << std::endl;
+            builder << std::string(indent, '\t')
+                    << "target     : " << CXX::Inspect::all(_this()->target()) << std::endl;
+            builder << std::string(indent, '\t')
+                    << "hosted_obj : " << CXX::Inspect::all(_this()->_hosted_obj) << std::endl;
+            builder << std::string(indent, '\t')
+                    << "sptr obj   : " << CXX::Inspect::all(_sptr.get()) << std::endl;
+            builder << std::string(indent, '\t')
+                    << "sptr count : " << CXX::Inspect::all(_sptr.use_count()) << std::endl;
+            if constexpr (!std::is_class<T>::value) {
+                builder << std::string(indent, '\t') << "value      : "
+                        << (!is_empty() ? CXX::Inspect::all(*_this()->obj()) : "<NULL>");
+            } else {
+                builder << std::string(indent, '\t') << "value      : ";
+                indent++;
+                builder << BasicSleeve::to_string(indent);
+                indent--;
+            }
+            indent--;
+            builder << std::endl;
+            builder << std::string(indent, '\t') << "}" << std::endl;
+            return builder.str();
+        }
+
+        std::string repr(int indent = 0) const override
+        {
+            std::stringstream builder;
+            builder << std::endl;
+            builder << std::string(indent, '\t');
+            //                    builder << //PARENT THIS
+            builder << CXX::Inspect::val(_this()) << " / ";
+            builder << CXX::Inspect::val(_this()->target()) << " / ";
+            builder << CXX::Inspect::val(_this()->obj()) << " / ";
+            builder << _sptr.use_count() << " / ";
+            builder << CXX::Inspect::type(_hosted_obj) << " - \"";
+            if constexpr (!std::is_class<T>::value) {
+                builder << (!is_empty() ? CXX::Inspect::val(*_this()->obj()) : "<NULL>") << "\"";
+            } else {
+                builder << " {" << std::endl;
+                indent++;
+                builder << BasicSleeve::repr(indent);
+                indent--;
+                builder << std::string(indent, '\t') << "}";
+            }
+            return builder.str();
+        }
+        //        static bool log_enabled;
+        Adapter::pEpLog::pEpLogger logger{ "Sleeve<" + std::string(typeid(T*).name()) + ">", true };
+
+    protected:
+        Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
+
+        const AllocFunc _effective_alloc{ std::bind(&Sleeve::_default_alloc, this) };
+        const FreeFunc _effective_free{
+            std::bind(&Sleeve::_default_free, this, std::placeholders::_1)
+        };
+        const ResolverFunc _target_resolver{ nullptr };
+
+        bool _is_owning{ true };
+        T* _hosted_obj{ nullptr };
+        SharedPtr _sptr{ nullptr };
+
+
+        // defaults for customizable functions
+        // -----------------------------------
+        T* _default_alloc()
+        {
+            T* ret = (T*)::calloc(1, sizeof(T));
+            pEpLogClass(CXX::Inspect::all(ret));
+            return ret;
+        }
+
+        void _default_free(T* ptr)
+        {
+            pEpLogClass(CXX::Inspect::all(ptr));
+            ::free(ptr);
+        }
+
+
+    private:
+        Sleeve<T*>* _this() const
+        {
+            return const_cast<Sleeve<T*>*>(this);
+        }
+    };
+
+    bool operator==(const BasicSleeve& a, const BasicSleeve& b)
+    {
+        return a.cmp(b) && b.cmp(a);
+    }
+
+    bool operator!=(const BasicSleeve& a, const BasicSleeve& b)
+    {
+        return !(a == b);
+    }
+}; // namespace POTS
+
+using POTS::operator==;
+using POTS::operator!=;
+
+
+//--------------------------------------------------------------------------------------------------
+// Example Datatypes libC99
+//--------------------------------------------------------------------------------------------------
+// Struct type specialization
+// operator <<
+// operator ==
+// operator =
+
+namespace LIBC99 {
+    using POTS::Sleeve;
+
+    class C99_C : public Sleeve<::C99_C*> {
+    public:
+        // HS
+        explicit C99_C() : Sleeve<::C99_C*>() {}
+        //        explicit C99_C(const ::C99_C& val) : Sleeve<::C99_C*>(val) {}
+        explicit C99_C(ResolverFunc target_resolver) : Sleeve<::C99_C*>(target_resolver) {}
+
+        // MDS
+        //        explicit C99_C(const std::string& name, Sleeve& parent, ResolverFunc target_resolver) :
+        //            Sleeve<::C99_C*>(name, parent, std::move(target_resolver))
+        //        {
+        //        }
+
+        // copy
+        //        explicit C99_C(const C99_C& rhs) : Sleeve<::C99_C*>(rhs) {}
+        //        explicit Sleeve(const std::string& name, Sleeve& parent, ResolverFunc target_resolver) :
+        Sleeve<int*> pi{ "pi", *this, [this]() { return &this->obj()->pi; } };
+        //        Sleeve<int*> pi{ "pi", *this };
+
+        C99_C& operator=(const ::C99_C& rhs)
+        {
+            Sleeve<::C99_C*>::operator=(rhs);
+            return *this;
+        }
+
+        //        bool operator==(const ::C99_C& rhs) const
+        //        {
+        //            pEpLogClass("called");
+        //            C99_C tmp{ rhs };
+        //            //            return *_this()->obj() == rhs;
+        //        }
+    };
+} // namespace LIBC99
+
+
+#endif

src/libc99.hh

@@ -0,0 +1,180 @@
+#ifndef LIBPEPDATAYPES_LIBC99_HH
+#define LIBPEPDATAYPES_LIBC99_HH
+
+#include "../examples/libc99/libc99.h"
+#include <exception>
+#include <vector>
+#include <string>
+
+
+namespace C99 {
+    namespace Utils {
+        // C99_Status
+        std::string to_string(const C99_Status& data)
+        {
+            switch (data) {
+                case OK:
+                    return "OK";
+                case ERROR:
+                    return "ERROR";
+            }
+        }
+
+        std::string to_string(const C99_Status*& data)
+        {
+            if (data) {
+                return to_string(*data);
+            } else {
+                return "<NULL>";
+            }
+        }
+
+        // C99_Enum
+        std::string to_string(const C99_Enum& data)
+        {
+            switch (data) {
+                case ONE:
+                    return "ONE";
+                case TWO:
+                    return "TWO";
+                case THREE:
+                    return "THREE";
+            }
+        }
+
+        std::string to_string(const C99_Enum* data)
+        {
+            if (data) {
+                return to_string(*data);
+            } else {
+                return "<NULL>";
+            }
+        }
+
+        // C99_C
+        std::string to_string(const ::C99_C& data, int indent = 0)
+        {
+            std::stringstream builder;
+            builder << std::endl;
+            builder << std::string(indent, '\t') << "{" << std::endl;
+            indent++;
+            builder << std::string(indent, '\t') << "i: '" << data.i << "'" << std::endl;
+            builder << std::string(indent, '\t') << "pi: '"
+                    << (data.pi != nullptr ? std::to_string(*data.pi) : "<NULL>") << "'"
+                    << std::endl;
+            indent--;
+            builder << std::string(indent, '\t') << "}";
+            return builder.str();
+        }
+
+        std::string to_string(const ::C99_C* data, int indent = 0)
+        {
+            if (data) {
+                return to_string(*data, indent);
+            } else {
+                return "<NULL>";
+            }
+        }
+
+        // C99_B
+        std::string to_string(const ::C99_B& data, int indent = 0)
+        {
+            std::stringstream builder;
+            builder << std::endl;
+            builder << std::string(indent, '\t') << "{" << std::endl;
+            indent++;
+            builder << std::string(indent, '\t') << "c: '" + to_string(data.c, indent) << "'"
+                    << std::endl;
+            indent--;
+            builder << std::string(indent, '\t') << "}";
+            return builder.str();
+        }
+
+        std::string to_string(const ::C99_B* data, int indent = 0)
+        {
+            if (data) {
+                return to_string(*data, indent);
+            } else {
+                return "<NULL>";
+            }
+        }
+
+        // C99_A
+        std::string to_string(const ::C99_A& data, int indent = 0)
+        {
+            std::stringstream builder;
+            builder << std::endl;
+            builder << std::string(indent, '\t') << "{" << std::endl;
+            indent++;
+            builder << std::string(indent, '\t') << "b: '" + to_string(data.b, indent) << "'"
+                    << std::endl;
+            indent--;
+            builder << std::string(indent, '\t') << "}";
+            return builder.str();
+        }
+
+        std::string to_string(const ::C99_A* data, int indent = 0)
+        {
+            if (data) {
+                return to_string(*data, indent);
+            } else {
+                return "<NULL>";
+            }
+        }
+
+
+    } // namespace Utils
+} // namespace C99
+
+// ostream inserters
+//C99_Status
+std::ostream& operator<<(std::ostream& o, const ::C99_Status& a)
+{
+    return o << C99::Utils::to_string(a);
+}
+std::ostream& operator<<(std::ostream& o, const ::C99_Status* a)
+{
+    return o << C99::Utils::to_string(a);
+}
+
+//C99_Enum
+std::ostream& operator<<(std::ostream& o, const ::C99_Enum& a)
+{
+    return o << C99::Utils::to_string(a);
+}
+std::ostream& operator<<(std::ostream& o, const ::C99_Enum* a)
+{
+    return o << C99::Utils::to_string(a);
+}
+
+//C99_C
+std::ostream& operator<<(std::ostream& o, const ::C99_C& a)
+{
+    return o << C99::Utils::to_string(a);
+}
+std::ostream& operator<<(std::ostream& o, const ::C99_C* a)
+{
+    return o << C99::Utils::to_string(a);
+}
+
+//C99_B
+std::ostream& operator<<(std::ostream& o, const ::C99_B& a)
+{
+    return o << C99::Utils::to_string(a);
+}
+std::ostream& operator<<(std::ostream& o, const ::C99_B* a)
+{
+    return o << C99::Utils::to_string(a);
+}
+
+//C99_A
+std::ostream& operator<<(std::ostream& o, const ::C99_A& a)
+{
+    return o << C99::Utils::to_string(a);
+}
+std::ostream& operator<<(std::ostream& o, const ::C99_A* a)
+{
+    return o << C99::Utils::to_string(a);
+}
+
+#endif // LIBPEPDATAYPES_LIBC99_HH

src/prototype.hh

@@ -0,0 +1,676 @@
+#include <iostream>
+#include <cctype>
+#include <utility>
+#include <pEp/utils.hh>
+#include <pEp/pEpLog.hh>
+#include <pEp/inspect.hh>
+#include <type_traits>
+#include "../examples/libc99/libc99.h"
+
+
+namespace pEp {
+
+
+//---------------------------------------------------------------------------------------------
+#define EXSTR(msg) std::string(__FUNCTION__) + "() - " + msg
+
+    template<class T>
+    class POD {
+        static_assert(
+            std::is_pod<T>::value && !std::is_pointer<T>::value,
+            "only POD value types supported");
+
+    public:
+        POD()
+        {
+            pEpLogClass("called");
+        };
+
+        explicit POD(T* pod_p, const T& init_val)
+        {
+            bind(pod_p, init_val);
+        }
+
+        // Best to use this constructor, as the object is in a valid state when the wrapped
+        // c_str (char*) is known
+        explicit POD(T* pod_p)
+        {
+            bind(pod_p);
+        }
+
+        void bind(T* pod_p, const T& init_val)
+        {
+            bind(pod_p);
+            this->operator=(init_val);
+        }
+
+        void bind(T* pod_p)
+        {
+            if (pod_p == nullptr) {
+                throw Exception{ EXSTR("cant bind on a nullptr") };
+            }
+
+            if (_is_initialized) {
+                throw Exception{ EXSTR("can only bind once") };
+            }
+            // init
+            _pod_p = pod_p;
+            _is_initialized = true;
+            pEpLogClass(to_string());
+        }
+
+        // make a copy
+        POD& operator=(T value)
+        {
+            pEpLogClass("Before: " + to_string() + " - new val: '" + CXX::Inspect::val(value) + "'");
+            *_pod_p = value;
+            //            pEpLogClass("After:  " + to_string());
+            return *this;
+        }
+
+        // return a copy
+        operator T() const
+        {
+            return *_pod_p;
+        }
+
+        // return address of the wrappee
+        T* data()
+        {
+            return _pod_p;
+        }
+
+        // return address of the wrappee (const)
+        const T* c_data() const
+        {
+            return _pod_p;
+        }
+
+        std::string to_string() const
+        {
+            std::string ret{ "[" + CXX::Inspect::all(_pod_p) + "]" };
+            return ret;
+        }
+
+        static bool log_enabled;
+
+    private:
+        bool _is_initialized{ false };
+        T* _pod_p{ nullptr };
+
+        Adapter::pEpLog::pEpLogger logger{ "pEp::POD", log_enabled };
+        Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
+
+        class Exception : public std::runtime_error {
+        public:
+            explicit Exception(const std::string& msg) : std::runtime_error(msg) {}
+        };
+    };
+
+    template<class T>
+    bool pEp::POD<T>::log_enabled{ false };
+
+    template<class T>
+    std::ostream& operator<<(std::ostream& o, pEp::POD<T> pEpPOD)
+    {
+        return o << (T)pEpPOD;
+    }
+
+    //---------------------------------------------------------------------------------------------
+    // Manages a char* to appear like a std::string
+    // char* c_str
+    // c_str MUST point to either:
+    // * NULL - means there is no value/mem alloc yet
+    // * dyn allocated memory
+    // in case the mem is already allocated, there must be 2 modes
+    // * take ownership (and free it)
+    // * dont take ownership, only provide a C++ interface
+    // There must be the option to construct the object before the wrapped c_str (char*)
+    // is known. This leads to a pEp::String object in invalid state, and it must be initialized using
+    // bind(). Otherwise all(most) functions will throw.
+    // bind() can only be called once, will throw otherwise.
+    // NON-owning mode, just does not free the string when it dies, owning mode does.
+    // Thats the only difference.
+    class String {
+    public:
+        // Best to use this constructor, as the object is in a valid state when the wrapped
+        // c_str (char*) is known
+        String(char** c_str_pp)
+        {
+            bind(c_str_pp);
+        }
+
+        // bind and set ownership
+        void bind(char** c_str_pp)
+        {
+            if (c_str_pp == nullptr) {
+                throw Exception{ EXSTR("cant bind on a nullptr") };
+            }
+
+            if (_is_bound) {
+                throw Exception{ EXSTR("can only be bound once") };
+            }
+
+            // init
+            _target = c_str_pp;
+            _is_bound = true;
+            pEpLogClass(to_string());
+
+            //if the c_str_p is nullptr then init with ""
+            if (*_target == nullptr) {
+                this->operator=("");
+            }
+        }
+
+        ~String()
+        {
+            if (_is_owner) {
+                _free(*_target);
+            }
+        }
+
+        // make a copy
+        String& operator=(const std::string& str)
+        {
+            pEpLogClass("Before: " + to_string() + " - new val: '" + pEp::Utils::clip(str, 30) + "'");
+            if (_target == nullptr) {
+                throw Exception{ EXSTR("invalid state") };
+            }
+
+            // DEALLOCATION
+            _free(*_target);
+
+            // ALLOCATION
+            *_target = _copy(str);
+            pEpLogClass("After:  " + to_string());
+            return *this;
+        }
+
+        // return a copy of whatever c_str currently is (maybe created by us, maybe changed meanwhile)
+        operator std::string() const
+        {
+            if (_target == nullptr) {
+                throw Exception{ EXSTR("invalid state") };
+            }
+
+            if (*_target != nullptr) {
+                return { *_target };
+            }
+            return {};
+        }
+
+        const char* c_data() const
+        {
+            if (_target == nullptr) {
+                throw Exception{ EXSTR("invalid state") };
+            }
+            return *_target;
+        }
+
+        char* data()
+        {
+            if (_target == nullptr) {
+                throw Exception{ EXSTR("invalid state") };
+            }
+            return *_target;
+        }
+
+        char** obj()
+        {
+            return _target;
+        }
+
+        operator const char*() const
+        {
+            return c_data();
+        }
+
+        operator char*()
+        {
+            return data();
+        }
+
+        operator char**()
+        {
+            return obj();
+        }
+
+
+        bool operator==(const pEp::String& pstr) const
+        {
+            return *(pstr.c_data()) == (*c_data());
+        }
+
+        bool operator!=(const pEp::String& pstr) const
+        {
+            return !(*this == pstr);
+        }
+
+        std::string to_string() const
+        {
+
+            if (_target == nullptr) {
+                throw Exception{ EXSTR("invalid state") };
+            }
+
+            std::string ret{ "[" + CXX::Inspect::all(_target) + " / " +
+                             CXX::Inspect::all(*_target) + "]" };
+            return ret;
+        }
+
+        void set_owner(bool is_owner)
+        {
+            pEpLogClass(std::to_string(is_owner));
+            _is_owner = is_owner;
+        }
+
+        bool is_owner() const
+        {
+            return _is_owner;
+        }
+
+        static bool log_enabled;
+
+    private:
+        char* _copy(const std::string& str)
+        {
+            char* ret = strdup(str.c_str());
+            pEpLogClass(CXX::Inspect::all(ret));
+            return ret;
+        }
+
+        void _free(char* ptr_type)
+        {
+            pEpLogClass(CXX::Inspect::all(ptr_type));
+            ::pEp_free(ptr_type);
+        }
+
+        bool _is_owner{ true };
+        bool _is_bound{ false };
+        char** _target{ nullptr };
+
+        Adapter::pEpLog::pEpLogger logger{ "pEp::String", log_enabled };
+        Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
+
+        class Exception : public std::runtime_error {
+        public:
+            explicit Exception(const std::string& msg) : std::runtime_error(msg) {}
+        };
+    };
+
+    bool pEp::String::log_enabled{ false };
+
+    std::ostream& operator<<(std::ostream& o, const pEp::String& pEpStr)
+    {
+        return o << std::string(pEpStr);
+    }
+
+    //---------------------------------------------------------------------------------------------
+    // TOOD:
+    // ctor not exception safe
+    // You can create an instance of a c-struct or you can wrap an already existing c-struct
+    // In both cases, you can define if the wrapper owns the instance, or not.
+    // If if owns it, it will free() it when the wrapper dies, otherwise it doesnt.
+    class BasicSleeve {
+    public:
+        virtual ~BasicSleeve() = default;
+    };
+
+
+    template<typename T>
+    class Sleeve : public BasicSleeve {
+    public:
+        // Creation
+        // --------
+        Sleeve() = delete;
+
+        // Create a sleeve and an instance
+        explicit Sleeve(const T& val) : _effective_resolver{ [this]() { return &_obj; } }, _obj(val)
+        {
+            pEpLogClass("hosting sleeve");
+        }
+
+        // create a sleeve on an instance
+        // using static binding to an existing object
+        explicit Sleeve(T* target) : _effective_resolver{ [target]() { return target; } }
+        {
+            pEpLogClass("static sleeve");
+        }
+
+        // create a sleeve on an instance
+        // using dynamic binding (to a per-access determined object using the custom resolver)
+        explicit Sleeve(std::function<T*()> resolver) : _effective_resolver{ std::move(resolver) }
+        {
+            pEpLogClass("dynamic sleeve");
+        }
+
+        // create a new instance and copy the value
+        explicit Sleeve(const Sleeve<T>& rhs) :
+            _effective_resolver{ [this]() { return &_obj; } },
+            _obj{ rhs._obj }
+        {
+            pEpLogClass("copy ctor");
+        }
+
+        // Assignment
+        // ----------
+        // takes a copy
+        Sleeve<T>& operator=(const Sleeve<T>& rhs)
+        {
+            pEpLogClass("called");
+            *obj_ptr() = rhs._obj;
+            return *this;
+        }
+
+        // assign the binding
+        Sleeve<T>& operator=(const T& rhs)
+        {
+            pEpLogClass("called");
+            *obj_ptr() = rhs;
+            return *this;
+        }
+
+        // Comparison
+        // ----------
+        // value comparison
+        bool operator==(const Sleeve<T>& rhs) const
+        {
+            pEpLogClass("called");
+            return *const_cast<Sleeve<T>*>(this)->obj_ptr() == *const_cast<Sleeve<T>&>(rhs).obj_ptr();
+        }
+
+        bool operator==(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return *const_cast<Sleeve<T>*>(this)->obj_ptr() == rhs;
+        }
+
+        //        bool operator!=(const Sleeve<T>& rhs) const
+        //        {
+        //            pEpLogClass("called");
+        //            return !operator==(rhs);
+        //        }
+
+        bool operator!=(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return !operator==(rhs);
+        }
+
+        // object comparison
+        bool is(const Sleeve<T>& rhs) const
+        {
+            pEpLogClass("called");
+            return id() == rhs.id();
+        }
+
+        bool is(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return const_cast<Sleeve<T>*>(this)->obj_ptr() == &rhs;
+        }
+
+        // Accessors
+        // ---------
+        // Access the object data r/w
+        T data()
+        {
+            pEpLogClass("called");
+            return *obj_ptr();
+        }
+
+        // Access the object data r/w
+        operator T()
+        {
+            pEpLogClass("called");
+            return *obj_ptr();
+        }
+
+        // Access the object pointer r/w
+        T* obj_ptr()
+        {
+            //            pEpLogClass("called");
+            return _effective_resolver();
+        }
+
+        // Misc
+        // ----
+        // obj_pointer as id
+        long id() const
+        {
+            //            pEpLogClass("called");
+            return reinterpret_cast<long>(const_cast<Sleeve<T>*>(this)->obj_ptr());
+        }
+
+        std::string to_string()
+        {
+            std::string ret{ "[" + CXX::Inspect::all(*obj_ptr()) + "]" };
+            return ret;
+        }
+
+        //        static bool log_enabled;
+        Adapter::pEpLog::pEpLogger logger{ typeid(T).name(), true };
+
+    protected:
+        Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
+
+        std::function<T*()> _effective_resolver;
+        T _obj;
+    };
+
+
+    template<typename T>
+    class Sleeve<T*> : public BasicSleeve {
+    public:
+        // Creates a new sleeve managing and holding a newly created object
+        explicit Sleeve() :
+            _target{ &_obj },
+            _obj{ _alloc_wrapper() },
+            _sptr{ *_target, std::bind(&Sleeve::_free_wrapper, this) }
+        {
+            pEpLogClass("new");
+        }
+
+        //Create a sleeve managing a C - sleeve explicit
+        Sleeve(T** target) :
+            _target(target),
+            _obj{ nullptr },
+            _sptr{ *_target, std::bind(&Sleeve::_free_wrapper, this) }
+        {
+            pEpLogClass("called");
+        }
+
+        explicit Sleeve(std::function<T**()> resolver) : _effective_resolver{ std::move(resolver) }
+        {
+            pEpLogClass("wrap");
+        }
+
+        const T* c_data() const
+        {
+            pEpLogClass("called");
+            return *obj_ptr();
+        }
+
+        // Access the object data r/w
+        T* data()
+        {
+            pEpLogClass("called");
+            return *obj_ptr();
+        }
+
+        // Access the object data read-only
+        operator const T*()
+        {
+            return c_data();
+        }
+
+        // Access the object data r/w
+        operator T*()
+        {
+            return data();
+        }
+
+        //        T* abandon()
+        //        {
+        //            T* ret = *_target;
+        //            _is_owning = false;
+        //            _obj = nullptr;
+        //            _sptr.reset(*_target, std::bind(&Sleeve::_free_wrapper, this));
+        //            return ret;
+        //        }
+
+        // Access the object pointer r/w
+        T** obj_ptr()
+        {
+            return _effective_resolver();
+        }
+
+        std::string to_string()
+        {
+            std::string ret{ "[" + CXX::Inspect::all(*obj_ptr()) + "]" };
+            return ret;
+        }
+
+        //        static bool log_enabled;
+        Adapter::pEpLog::pEpLogger logger{ typeid(T*).name(), true };
+
+    protected:
+        Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
+
+
+        const std::function<T*()> _effective_alloc{ std::bind(&Sleeve::_default_alloc, this) };
+        const std::function<void(T*)> _effective_free{
+            std::bind(&Sleeve::_default_free, this, std::placeholders::_1)
+        };
+
+        // We have as many indirections as we have levels in the hosting data structure
+        // When the obj is member of a struct, the obj we actually wrap can change without
+        // further noctice from the C99 side.
+        // Therefore for EVERY access to to the obj we need to ask the hosting struct for the
+        // address of our obj. If the hosting struct is a member of a struct itself, it will have to
+        // to ask its hosting struct and so forth... recursively.
+        // For every access, you have as many indirections as levels deep your object is in the struct.
+        // Using this technique, we can also accommodate for wrapping an object which can
+        // be REPLACED without further notice, handing out a T**.
+        const std::function<T**()> _effective_resolver{ std::bind(&Sleeve::_default_resolver, this) };
+
+        bool _is_owning{ true };
+        // we ALWAYS have a _target that points to either an internal or external obj
+        T** _target{ nullptr };
+        // we MAYBE also have an obj
+        T* _obj{ nullptr };
+        // we NEVER operate on the obj, but only on the _target
+
+        // All the shared ptr does, is freeing *_target when last copy dies
+        // the shared pointer CAN NOT have the correct obj pointer at all times,
+        // because the object can change without notice from the C99 side.
+        // Thats why this class basically is an (infinitely) indirect shared pointer.
+        std::shared_ptr<typename std::remove_pointer<T*>::type> _sptr;
+
+
+        // defaults for customizable functions
+        // -----------------------------------
+
+        T* _default_alloc()
+        {
+            T* ret = (T*)calloc(1, sizeof(T));
+            pEpLogClass(CXX::Inspect::all(ret));
+            return ret;
+        }
+
+        void _default_free(T* ptr)
+        {
+            pEpLogClass(CXX::Inspect::all(ptr));
+            free(ptr);
+        }
+
+        T** _default_resolver()
+        {
+            pEpLogClass(CXX::Inspect::all(_target));
+            return _target;
+        }
+
+        // wrappers
+        // --------
+
+        T* _alloc_wrapper()
+        {
+            pEpLogClass("called");
+            return _effective_alloc();
+        }
+
+        void _free_wrapper()
+        {
+            pEpLogClass("called");
+            if (_is_owning) {
+                _effective_free(*obj_ptr());
+            }
+        }
+    };
+
+
+    //    template<typename T>
+    //    class Sleeve<T*> : public BasicSleeve {
+    //
+    //    };
+
+
+    // TOOD://
+    // alloc/free:
+    // the alloc() and free() functions HAVE to use calloc/malloc NOT 'new', because we are interfacing
+    // c99 code that could possibly get ownership of the struct and can only free memory that has
+    // been allocated using malloc/calloc. (malloc/free - new/delete are NOT compatible)
+    //---------------------------------------------------------------------------------------------
+    class C : public Sleeve<::C99_C*> {
+    public:
+        // create a new instance
+        explicit C() : Sleeve<::C99_C*>() {}
+        // create an instance wrapper
+        //        explicit C(::C* obj) : Sleeve<::C>(obj) {}
+        // create an instance-ptr wrapper
+        //        explicit C(::C** obj_ptr) : Sleeve<::C>(obj_ptr) {}
+        explicit C(std::function<::C99_C**()> resolver) : Sleeve<::C99_C*>(resolver) {}
+
+        pEp::Sleeve<int> i{ [this]() { return &dynamic_cast<C*>(this)->data()->i; } };
+        //        pEp::Sleeve<int*> pi{ this, [](BasicSleeve* parent) {
+        //                                 return &dynamic_cast<C*>(parent)->data()->pi;
+        //                             } };
+    };
+
+
+    //    // ------------------------------------------------------------------------------------------
+    //    class B : public Sleeve<::C99_B*> {
+    //    public:
+    //        // create a new instance
+    //        explicit B() : Sleeve<::C99_B*>() {}
+    //        // create an instance wrapper
+    //        //        explicit B(::B* obj) : Sleeve<::B>(obj) {}
+    //        // create an instance-ptr wrapper
+    //        //        explicit B(::B** obj_ptr) : Sleeve<::B>(obj_ptr) {}
+    //        explicit B(BasicSleeve* parent, std::function<::C99_B**(BasicSleeve*)> resolver) :
+    //            Sleeve<::C99_B*>(parent, resolver)
+    //        {
+    //        }
+    //
+    //        pEp::C c{ this, [](BasicSleeve* parent) { return &dynamic_cast<B*>(parent)->data()->c; } };
+    //    };
+    //
+    //
+    //    // ------------------------------------------------------------------------------------------
+    //    class A : public Sleeve<::C99_A*> {
+    //    public:
+    //        // create a new instance
+    //        explicit A() : Sleeve<::C99_A*>() {}
+    //        // create an instance wrapper
+    //        //        explicit A(::A* obj) : Sleeve<::A>(obj) {}
+    //        // create an instance-ptr wrapper
+    //        //        explicit A(::A** obj_ptr) : Sleeve<::A>(obj_ptr) {}
+    //        explicit A(BasicSleeve* parent, std::function<::C99_A**(BasicSleeve*)> resolver) :
+    //            Sleeve<::C99_A*>(parent, resolver)
+    //        {
+    //        }
+    //
+    //        pEp::B b{ this, [](BasicSleeve* parent) { return &dynamic_cast<A*>(parent)->data()->b; } };
+    //    };
+
+} // namespace pEp

test/Makefile

@@ -1,23 +1,31 @@
 include ../Makefile.conf
 
-LDFLAGS=-L../src -L$(PREFIX)/lib -L$(PREFIX_GTEST)/lib
-LDLIBS=-lstdc++ -lpEpEngine -lpEpAdapter
-CXXFLAGS:=-I../src $(CXXFLAGS) -I$(PREFIX_GTEST)/include
+LIBC99_PATH=../examples/libc99/
+LIBC99_STATIC=$(LIBC99_PATH)libc99.a
+LIBPEPDATATYPES_PATH=../src/
+LIBPEPDATATYPES_STATIC=$(LIBPEPDATATYPES_PATH)libpepdatatypes.a
 
-TEST_SOURCE=$(wildcard *.cc)
-TEST_OBJECTS=$(subst .cc,.o,$(TEST_SOURCE))
+LDLIBS=-lstdc++ -lpEpEngine -lpEpCxx11 -lpEpAdapter -lPityTest11 -lpthread -ldl -lm $(LIBC99_STATIC)
+CXXFLAGS+=-I$(LIBPEPDATATYPES_PATH) -I$(LIBC99_PATH)
 
-.PHONY: all, clean
+# Test
+SRC_TEST=$(wildcard test_*.cc)
+BIN_TEST=$(subst .cc,,$(SRC_TEST))
 
-all: unittests
+.PHONY: libc99 tests all clean
 
-unittests: $(TEST_OBJECTS) ../src/libpEpDatatypes.a
-	$(CXX) $(LDFLAGS) -o $@ $^ $(LDLIBS) -lgtest -lgtest_main
+all: libc99 tests
 
+libc99: $(LIBC99_STATIC)
 
+$(LIBC99_STATIC):
+	$(MAKE) -C ../examples/libc99
+
+tests: $(BIN_TEST)
 
 
 clean:
-	rm -f unittests
+	rm -f $(BIN_TEST)
 	rm -Rf *.dSYM
-	rm -f *.o
+	rm -f *.d
+	rm -f *.o

test/test_cxx.cc

@@ -0,0 +1,73 @@
+#include <map>
+#include <pEp/pEpLog.hh>
+#include "pEp/inspect.hh"
+#include "../examples/libc99/libc99.h"
+#include "../src/libc99.hh"
+//#include "../src/POTS.hh"
+
+using namespace pEp;
+
+struct Struct {
+    int a;
+    int b;
+};
+
+template<typename T>
+class Field {
+public:
+    Field() = default;
+    Field(T* target) {
+        bind(target);
+    }
+
+    void bind(T* target) {
+        _target = target;
+    }
+    operator T()
+    {
+        return *_target;
+    }
+
+    Field& operator=(T val)
+    {
+        *_target = val;
+        return *this;
+    }
+
+private:
+    T* _target{ nullptr};
+};
+
+class A : public Field<A> {
+public:
+    A() : _obj{ std::make_shared<Struct>() } {
+        a.bind(&_obj->a);
+        b.bind(&_obj->b);
+    }
+
+    
+    std::shared_ptr<Struct> _obj;
+    Field<int> a{};
+    Field<int> b{};
+};
+
+int main()
+{
+    Adapter::pEpLog::set_enabled(true);
+    pEpLog("start");
+    A b{};
+    pEpLog(b.a);
+    //    pEpLog(b.b);
+
+    {
+        A a{};
+        a.a = 23;
+        a.b = 42;
+        pEpLog(a.a);
+        //        pEpLog(a.b);
+
+        b = a;
+    }
+    pEpLog(b.a);
+    //    pEpLog(b.b);
+}

test/test_identity.cc

@@ -0,0 +1,71 @@
+#include "../src/prototype.hh"
+#include <pEp/pEpEngine.h>
+#include <pEp/message_api.h>
+#include <pEp/keymanagement.h>
+#include <pEp/identity_list.h>
+#include <pEp/pEpLog.hh>
+
+
+//---------------------------------------------------------------------------------------------
+namespace pEp {
+    class Identity : public Sleeve<::pEp_identity> {
+    public:
+        Identity(::pEp_identity** ident_p = nullptr) : PODStruct<::pEp_identity>(ident_p) {}
+
+        Identity(
+            const std::string& address = "",
+            const std::string& username = "",
+            const std::string& user_id = "",
+            const std::string& fpr = "") :
+            Sleeve<::pEp_identity>(nullptr)
+        {
+            pEpLogClass("called");
+            this->address = address;
+            this->username = username;
+            this->user_id = user_id;
+            this->fpr = fpr;
+        }
+
+        pEp::String fpr{ &data()->fpr };
+        pEp::String user_id{ &data()->user_id };
+        pEp::String username{ &data()->username };
+        pEp::POD<::PEP_comm_type> comm_type{ &data()->comm_type };
+        //char[3] lang
+        pEp::POD<bool> me{ &data()->me };
+        pEp::POD<unsigned int> major_ver{ &data()->major_ver };
+        pEp::POD<unsigned int> minor_ver{ &data()->minor_ver };
+        pEp::POD<::PEP_enc_format> enc_format{ &data()->enc_format };
+        pEp::POD<::identity_flags_t> flags{ &data()->flags };
+    };
+
+    template<>
+    bool Sleeve<::pEp_identity>::log_enabled{ false };
+
+} // namespace pEp
+
+int main()
+{
+    pEp::Adapter::pEpLog::set_enabled(true);
+    ::PEP_SESSION session;
+    setenv("HOME", ".", 1);
+    ::init(&session, nullptr, nullptr, nullptr);
+
+    // create identity
+    pEp::Identity id1{ "wrong@entry.lol", "wrong", "23", "INVA_FPR" };
+
+    pEpLog(id1.c_data());
+    id1.username = "alice";
+    id1.address = "alice@peptest.org";
+    id1.
+
+    pEpLog(id1.address);
+    pEpLog(id1.username);
+    ::myself(session, id1);
+    pEpLog(id1.c_data());
+
+    pEp::Identity id2{ "bob" };
+    ::update_identity(session, id2);
+    pEpLog(id2.c_data());
+
+    return 0;
+}

test/test_prototype.cc

@@ -0,0 +1,414 @@
+#include <iostream>
+#include <cctype>
+#include <pEp/pEpEngine.h>
+#include <pEp/message_api.h>
+#include <pEp/keymanagement.h>
+#include <pEp/identity_list.h>
+#include <utility>
+#include <pEp/utils.hh>
+#include <pEp/pEpLog.hh>
+#include <pEp/inspect.hh>
+#include <type_traits>
+//#include "../examples/libc99/libc99.h"
+#include "../src/prototype.hh"
+
+void test_getters(int* c_int_p, pEp::POD<int>& pint, int expected)
+{
+//    pEpLog("to_string(): " + pint.to_string());
+    // compare addresses
+    pEpLog("addresses == c_int_p");
+    assert(pint.c_data() == c_int_p);
+    assert(pint.data() == c_int_p);
+
+    // compare values
+    if (c_int_p != nullptr) {
+        pEpLog("operator int(): " + std::to_string(pint));
+        assert(pint == *c_int_p);
+        assert(pint == expected);
+
+        // will segfault with nullptr, and this is correct
+        pEpLog("data(): " + std::to_string(*pint.data()));
+        assert(*pint.data() == *c_int_p);
+        assert(*pint.data() == expected);
+
+        pEpLog("c_data(): " + std::to_string(*pint.c_data()));
+        assert(*pint.c_data() == *c_int_p);
+        assert(*pint.c_data() == expected);
+    }
+}
+
+void test_assign(int* c_int_p, pEp::POD<int>& pint)
+{
+    {
+        pEpLogH2("assign operator");
+        int new_val = 23;
+        pint = new_val;
+        test_getters(c_int_p, pint, new_val);
+    }
+    {
+        pEpLogH2("raw c_str assign");
+        int new_val = 23;
+        *c_int_p = new_val;
+        test_getters(c_int_p, pint, new_val);
+    }
+}
+
+
+void test_getters(char** c_str_p, pEp::String& pstr, const std::string& expected)
+{
+    pEpLog("to_string(): " + pstr.to_string());
+    // compare addresses
+    pEpLog("addresses == c_str_p");
+    assert(pstr.c_data() == *c_str_p);
+    assert(pstr.obj() == c_str_p);
+
+    // compare values
+    if (*c_str_p != nullptr) {
+        pEpLog("operator std::string(): " + std::string(pstr));
+        assert(std::string(pstr) == std::string(*c_str_p));
+        assert(std::string(pstr) == expected);
+
+        // will segfault with nullptr, and this is correct
+        pEpLog("data(): " + std::string(*pstr.obj()));
+        assert(std::string(*pstr.obj()) == std::string(*c_str_p));
+        assert(std::string(*pstr.obj()) == expected);
+
+        pEpLog("c_data(): " + std::string(pstr.c_data()));
+        assert(std::string(pstr.c_data()) == std::string(*c_str_p));
+        assert(std::string(pstr.c_data()) == expected);
+    } else {
+        std::string tmp{ pstr };
+        pEpLog("operator std::string(): " + tmp);
+        assert(tmp.empty());
+    }
+}
+
+void test_assign(char** c_str_p, pEp::String& pstr)
+{
+    {
+        pEpLogH2("assign operator");
+        std::string new_val{ "assign operator" };
+        pstr = new_val;
+        test_getters(c_str_p, pstr, new_val);
+    }
+    {
+        pEpLogH2("raw c_str assign");
+        std::string new_val{ "raw c_str assign" };
+        free(*c_str_p);
+        *c_str_p = strdup(new_val.c_str());
+        test_getters(c_str_p, pstr, new_val);
+    }
+}
+
+
+//void test_func1(char** out) {
+//    *out = strdup("fds");
+//}
+
+
+int main()
+{
+    // c-types are always POD
+    // we need to handle pointer types and value types differently
+    // pointer types need to be memory-managed (heap)
+    // value types are being copied around (stack)
+    static_assert(std::is_pod<int>::value && !std::is_pointer<int>::value, "not an integral");
+    static_assert(
+        std::is_pod<::C99_Enum>::value && !std::is_pointer<::C99_Enum>::value,
+        "not an integral");
+    static_assert(std::is_pod<::C99_B>::value && !std::is_pointer<::C99_B>::value, "not an integral");
+
+    //    pEp::Utils::readKey();
+    pEp::Adapter::pEpLog::set_enabled(true);
+
+    //    char* tmp = strdup("fd");
+    //    std::cout << pEp::CXX::Inspect::all(tmp) << std::endl;
+    //    change_ptr(tmp);
+    //    std::cout << pEp::CXX::Inspect::all(tmp) << std::endl;
+
+    //    char *ht;
+    //    pEp::String tmp1{true,&ht};
+    //
+    //    test_func1(tmp1);
+    //    std::cout << tmp1;
+
+    // POD
+    if (0) {
+        // VALID USAGE
+        int init_val = 0;
+        // new pEp::POD on int
+        {
+            pEpLogH1("new pEp::POD on int");
+            int c_int = init_val;
+            pEp::POD<int> pint(&c_int);
+            test_getters(&c_int, pint, init_val);
+            test_assign(&c_int, pint);
+        }
+        // equality operator
+        {
+            pEpLogH1("equality operator");
+            int c_int1 = init_val;
+            int c_int2 = init_val;
+            pEp::POD<int> pint1(&c_int1);
+            pEp::POD<int> pint2(&c_int2);
+            assert(pint1 == pint2);
+
+            c_int2 = 23;
+            assert(pint1 != pint2);
+        }
+    }
+
+    // String
+    //            pEp::String::log_enabled = false;
+    if (0) {
+        //TODO: Test non-owning mode
+        //
+        // INVALID USAGE
+        //    char* c_str_u;           // uninitialized == INVALID
+        //    undefined behaviour, most likely "pointer being freed was not allocated"
+        //    {
+        //        char* c_str;
+        //        pEp::String pstr(c_str);
+        //    }
+        //    char* c_str_s = "fdsfs"; // statically initialized == INVALID
+        //    {
+        //        char ca[4] = { 'p', 'E', 'p'};
+        //        char* c_str = ca;
+        //        pEp::String pstr(c_str);
+        //    }
+
+        // VALID USAGE
+        {
+            pEpLogH1("new pEp::String on char* pointing to NULL");
+            char* c_str = NULL; // nullptr
+
+            pEp::String pstr(&c_str);
+            test_getters(&c_str, pstr, "");
+            test_assign(&c_str, pstr);
+        }
+
+        std::string init_val{ "initialized c string" };
+        {
+            pEpLogH1("new pEp::String on already initalized char*");
+            char* c_str = strdup(init_val.c_str());
+
+            pEp::String pstr(&c_str);
+            test_getters(&c_str, pstr, init_val);
+            test_assign(&c_str, pstr);
+        }
+
+        // equality operator
+        {
+            pEpLogH1("equality operator");
+
+            char* c_str1 = strdup(init_val.c_str());
+            char* c_str2 = strdup(init_val.c_str());
+            pEp::String pstr1{ &c_str1 };
+            pEp::String pstr2{ &c_str2 };
+            assert(pstr1 == pstr2);
+            pstr2 = "huhu";
+            assert(pstr1 != pstr2);
+        }
+    }
+
+
+    if (1) {
+        pEpLogH2("Create a sleeve and an instance");
+        int i = 23;
+        pEp::Sleeve<int> ot_i{ i };
+
+
+        pEpLog(pEp::CXX::Inspect::all(i));
+        pEpLog(ot_i.to_string());
+        assert(ot_i == i);
+        assert(!ot_i.is(i));
+
+        pEpLogH3("change from C++ / POTS");
+        pEp::Sleeve<int> i_pots{42};
+        ot_i = i_pots;
+        assert(ot_i == i_pots);
+        assert(!ot_i.is(i_pots));
+
+        pEpLogH3("change from C++ / native");
+        int i_native = 23;
+        ot_i = i_native;
+        assert(ot_i == i_native);
+        assert(!ot_i.is(i_native));
+
+        pEpLogH3("change from C99");
+        i = 42;
+        int* pi = ot_i.obj_ptr();
+        *pi = i;
+        assert(ot_i == i);
+        assert(!ot_i.is(i));
+    }
+
+    if (1) {
+        pEpLogH2("create a sleeve on an instance, static");
+        int i{ 23 };
+        pEp::Sleeve<int> ot_i{ &i };
+        pEpLog(pEp::CXX::Inspect::all(i));
+        pEpLog(ot_i.to_string());
+        assert(ot_i == i);
+        assert(ot_i.is(i));
+
+        pEpLogH3("change from C++ / POTS");
+        pEp::Sleeve<int> i_pots{42};
+        ot_i = i_pots;
+        assert(ot_i == i_pots);
+        assert(!ot_i.is(i_pots));
+
+        pEpLogH3("change from C++ / native");
+        int i_native = 23;
+        ot_i = i_native;
+        assert(ot_i == i_native);
+        assert(!ot_i.is(i_native));
+
+        pEpLogH3("change from C99");
+        i = 42;
+        int* pi = ot_i.obj_ptr();
+        *pi = i;
+        assert(ot_i == i);
+        assert(ot_i.is(i));
+    }
+
+    if (1) {
+        pEpLogH2("create a sleeve on an instance, dynamic");
+        int i{ 23 };
+        pEp::Sleeve<int> ot_i{ [&i](){ return &i;} };
+        pEpLog(pEp::CXX::Inspect::all(i));
+        pEpLog(ot_i.to_string());
+        assert(ot_i == i);
+        assert(ot_i.is(i));
+
+        pEpLogH3("change from C++ / POTS");
+        pEp::Sleeve<int> i_pots{42};
+        ot_i = i_pots;
+        assert(ot_i == i_pots);
+        assert(!ot_i.is(i_pots));
+
+        pEpLogH3("change from C++ / native");
+        int i_native = 23;
+        ot_i = i_native;
+        assert(ot_i == i_native);
+        assert(!ot_i.is(i_native));
+
+        pEpLogH3("change from C99");
+        i = 42;
+        int* pi = ot_i.obj_ptr();
+        *pi = i;
+        assert(ot_i == i);
+        assert(ot_i.is(i));
+    }
+
+    // Struct
+    /*    if (0) {
+        // sleeve empty
+        {
+            pEp::Sleeve<::B> pstruct1{ nullptr };
+            const B* cc_struct = pstruct1;
+            B* c_struct = pstruct1;
+            assert(pstruct1.data() == nullptr);
+            assert(pstruct1.c_data() == nullptr);
+            assert(c_struct == nullptr);
+            assert(cc_struct == nullptr);
+            pEpLog("DONE");
+
+            //            return_struct(pstruct1);
+        }
+
+        // Creates a sleeve managing and holding a newly created object
+        {
+            pEp::Sleeve<::B> pstruct1{};
+            B* c_struct = pstruct1;
+            c_struct->c_int = 3;
+            c_struct->c_str = std::string("huhu").data();
+            c_struct->c_enum = TWO;
+            pEpLog("DONE");
+        }
+
+        // Create a sleeve managing and holding an already existing object
+        {
+            // create an object
+            ::B* c_struct1 = ::new_B(0, ONE, "pEp");
+            pEpLog(c_struct1->c_int);
+            pEpLog(c_struct1->c_enum);
+            pEpLog(c_struct1->c_str);
+            pEpLog("DONE");
+
+            // reference the object
+            pEp::Sleeve<::B> pstruct1{ c_struct1 };
+            pEpLog("DONE");
+        }
+
+        // Create a sleeve managing a C-sleeve
+        {
+
+            B* c_struct = nullptr;
+            pEp::Sleeve<::B> pstruct1{ &c_struct };
+            //            c_struct->c_str = strdup("pEp");
+            //            c_struct->c_int = 5;
+            //            c_struct->c_enum = TWO;
+        }
+    }
+    */
+    // Calling conventions
+    //    pEp::Utils::readKey();
+    //    {
+    //        pEpLogH1("use_struct()");
+    //        {
+    //            pEp::A a{};
+    //            use_struct(a);
+    //        }
+    //    pEpLogH1("c99_supply_struct()");
+    //    {
+    //        int val = 23;
+    //        // C99
+    //        {
+    //            // prepare data structure
+    //            ::C99_A* c_a = ::c99_A_new();
+    //            c_a->b = c99_B_new();
+    //            c_a->b->c = c99_C_new();
+    //            c_a->b->c->pi = (int*)calloc(1, sizeof(int));
+    //            *c_a->b->c->pi = val;
+    //
+    //            // call supply
+    //            ::C99_Status status = c99_supply_struct(c_a);
+    //
+    //            // test
+    //            assert(!status);
+    //            assert(*c_a->b->c->pi == val * 2);
+    //        }
+
+    // C++
+    {
+
+        //            a = b;
+        //            b = 5
+        //            a.b = pEp::B{};
+        //            a.b.c = pEp::C{};
+        //            a.b.c.pi = (int*)calloc(1, sizeof(int));
+        //            a.b.c.pi = 23;
+        //            ::Status status = supply_struct(a);
+        //             test
+        //            assert(!status);
+        //            assert(*a.b.c.pi == val * 2);
+    }
+    //            pstruct1.c_int
+    //    }
+    //        pEpLogH1("provide_struct()");
+    //        {
+    //            pEp::A a{};
+    //            //release ownership
+    //            provide_struct(a);
+    //        }
+    //        pEpLogH1("return_struct()");
+    //        {
+    //            A* a = NULL;
+    //            return_struct(&a);
+    //            pEp::A pa{ a };
+    //            pEpLog(*(pa.b.c.pi.data()));
+    //        }
+    //    }
+    return 0;
+}

test/test_sleeve.cc

@@ -0,0 +1,593 @@
+#include <iostream>
+#include <utility>
+#include <pEp/pEpLog.hh>
+#include "../src/POTS.hh"
+#include "../src/libc99.hh"
+//using namespace pEp;
+using POTS::operator==;
+
+#define TEST_IS_COPY(a, b)                                                                         \
+    do {                                                                                           \
+        pEpLog("Test is copy");                                                                    \
+        assert(b == a);                                                                            \
+        assert(!b.is(a));                                                                          \
+    } while (0);
+
+#define TEST_IS_REF(a, b)                                                                          \
+    do {                                                                                           \
+        pEpLog("Test is ref");                                                                     \
+        assert(b == a);                                                                            \
+        assert(b.is(a));                                                                           \
+    } while (0);
+
+//template<typename A, typename B>
+//int TEST_IS_COPY(const A& a, const B& b)
+//{
+//    pEpLog("Test is copy");
+//    assert(b == a);
+//    assert(!b.is(a));
+//    return 0;
+//}
+//
+//template<typename A, typename B>
+//int TEST_IS_REF(const A& a, const B& b)
+//{
+//    pEpLog("Test is ref");
+//    assert(b == a);
+//    assert(b.is(a));
+//    return 0;
+//}
+
+//template<typename T, typename Enabled = void>
+//class TestSleeve;
+
+// -------------------------------------------------------------------------------------------------
+// FUNDAMENTAL
+// -------------------------------------------------------------------------------------------------
+
+template<typename T>
+class PODFactory {
+public:
+    using FactoryFunc = const std::function<T*(const T&)>;
+
+public:
+    PODFactory() = delete;
+    PODFactory(const T& value) : _factory_func{ new_ }, _value{ value } {}
+    PODFactory(FactoryFunc& init1, const T& value) : _factory_func{ init1 }, _value{ value } {}
+
+    operator T()
+    {
+        return new_value();
+    }
+
+    operator T*()
+    {
+        return new_obj();
+    }
+
+    T* new_obj()
+    {
+        return _factory_func(_value);
+    }
+
+    T& new_value()
+    {
+        return *new_obj();
+    }
+
+private:
+    static T* new_(const T& val)
+    {
+        T* ret = (T*)calloc(1, sizeof(T));
+        *ret = val;
+        return ret;
+    }
+
+    FactoryFunc _factory_func;
+    const T& _value;
+};
+
+template<typename T>
+class TestSleeve;
+
+// VALUE -------------------------------------------------------------------------------------------------
+template<typename T>
+class TestSleeve {
+public:
+    TestSleeve(PODFactory<T> init1, PODFactory<T> init2) : factory1{ init1 }, factory2{ init2 }
+    {
+        test_sleeve();
+    }
+
+    int test_sleeve()
+    {
+        pEpLogH1("Test sleeve<" + std::string(typeid(T).name()) + ">");
+        test_HS();
+        test_BS();
+        return 0;
+    }
+
+    int test_HS()
+    {
+        pEpLogH1("Test HS<" + std::string(typeid(T).name()) + ">");
+        {
+            pEpLogH2("Test HS ctor");
+            T a = factory1;
+            POTS::Sleeve<T> b{ a };
+            pEpLog(b.to_string());
+            TEST_IS_COPY(a, b);
+        }
+        {
+            pEpLogH2("Test assign HS");
+            T a1 = factory1;
+            POTS::Sleeve<T> b1{ a1 };
+            pEpLog(b1.to_string());
+
+            T a2 = factory2;
+            POTS::Sleeve<T> b2{ a2 };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_COPY(b1, b2);
+        }
+        {
+            pEpLogH2("Test assign BS");
+            T a1 = factory1;
+            POTS::Sleeve<T> b1{ a1 };
+            pEpLog(b1.to_string());
+
+            T a2 = factory2;
+            ;
+            POTS::Sleeve<T> b2{ [&a2]() { return &a2; } };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_COPY(b1, b2);
+        }
+        {
+            pEpLogH2("Test copy ctor");
+            T a = factory1;
+            POTS::Sleeve<T> b1{ a };
+            pEpLog(b1.to_string());
+
+            POTS::Sleeve<T> b2{ b1 };
+            pEpLog(b2.to_string());
+            TEST_IS_COPY(b1, b2);
+        }
+        return 0;
+    }
+
+    int test_BS()
+    {
+        pEpLogH1("Test BS<" + std::string(typeid(T).name()) + ">");
+        {
+            pEpLogH2("Test BS ctor");
+            T a1 = factory1;
+            POTS::Sleeve<T> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+            TEST_IS_REF(a1, b1);
+        }
+        {
+            pEpLogH2("Test assign HS");
+            T a1 = factory1;
+            POTS::Sleeve<T> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            T a2 = factory2;
+            ;
+            POTS::Sleeve<T> b2{ a2 };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_COPY(b1, b2);
+        }
+        {
+            pEpLogH2("Test assign BS");
+            T a1 = factory1;
+            POTS::Sleeve<T> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            T a2 = factory2;
+            ;
+            POTS::Sleeve<T> b2{ [&a2]() { return &a2; } };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_COPY(b1, b2);
+        }
+        {
+            pEpLogH2("Test copy ctor");
+            T a1 = factory1;
+            pEpLog(a1);
+            POTS::Sleeve<T> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1);
+            pEpLog(b1.to_string());
+
+            POTS::Sleeve<T> b2{ b1 };
+            pEpLog(b2.to_string());
+
+            TEST_IS_COPY(b1, b2);
+        }
+        return 0;
+    }
+
+private:
+    PODFactory<T> factory1;
+    PODFactory<T> factory2;
+};
+
+
+// POINTER -------------------------------------------------------------------------------------------------
+
+template<typename T>
+class TestSleeve<T*> {
+public:
+    TestSleeve(PODFactory<T> init1, PODFactory<T> init2) : factory1{ init1 }, factory2{ init2 }
+    {
+        test_sleeve();
+    }
+
+    int test_sleeve()
+    {
+        pEpLogH1("Test sleeve<" + std::string(typeid(T*).name()) + ">");
+        test_HS();
+        test_BS();
+        return 0;
+    }
+
+    int test_HS()
+    {
+        pEpLogH1("Test HS<" + std::string(typeid(T*).name()) + ">");
+        {
+            pEpLogH2("Test HS ctor");
+            POTS::Sleeve<T*> b1{};
+            pEpLog(b1.to_string());
+        }
+        {
+            pEpLogH2("Test assign RAW-T (value)");
+            POTS::Sleeve<T*> b1{};
+            pEpLog(b1.to_string());
+
+            T b2 = factory2;
+            pEpLog(b2);
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_COPY(b2, b1);
+        }
+        {
+            pEpLogH2("Test assign HS");
+            POTS::Sleeve<T*> b1{};
+            pEpLog(b1.to_string());
+
+            POTS::Sleeve<T*> b2{};
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        {
+            pEpLogH2("Test assign BS");
+            POTS::Sleeve<T*> b1{};
+            pEpLog(b1.to_string());
+
+            T* a2 = factory1;
+            POTS::Sleeve<T*> b2{ [&a2]() { return &a2; } };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        {
+            pEpLogH2("Test copy ctor");
+            POTS::Sleeve<T*> b1{};
+            pEpLog(b1.to_string());
+
+            POTS::Sleeve<T*> b2{ b1 };
+            pEpLog(b2.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        return 0;
+    }
+
+    int test_BS()
+    {
+        pEpLogH1("Test BS");
+        {
+            pEpLogH2("Test BS ctor");
+            T* a1 = factory1;
+            POTS::Sleeve<T*> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+            TEST_IS_REF(a1, b1);
+        }
+        {
+            pEpLogH2("Test assign RAW-T (value)");
+            T* a1 = factory1;
+            POTS::Sleeve<T*> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            T b2 = factory2;
+            pEpLog(b2);
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_COPY(b2, b1);
+        }
+        {
+            pEpLogH2("Test assign HS");
+            T* a1 = factory1;
+            POTS::Sleeve<T*> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            POTS::Sleeve<T*> b2{};
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        {
+            pEpLogH2("Test assign BS");
+            T* a1 = factory1;
+            POTS::Sleeve<T*> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            T* a2 = factory2;
+            POTS::Sleeve<T*> b2{ [&a2]() { return &a2; } };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        {
+            pEpLogH2("Test copy ctor");
+
+            T* a1 = factory1;
+            POTS::Sleeve<T*> b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            POTS::Sleeve<T*> b2{ b1 };
+            pEpLog(b2.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        return 0;
+    }
+
+private:
+    PODFactory<T> factory1;
+    PODFactory<T> factory2;
+};
+
+
+// STRUCT P -------------------------------------------------------------------------------------------------
+template<>
+//class TestSleeve<T*, typename std::enable_if<std::is_fundamental<T>::value || std::is_enum<T>::value>::type> {
+class TestSleeve<::C99_C*> {
+public:
+    TestSleeve(PODFactory<::C99_C> init1, PODFactory<::C99_C> init2) :
+        factory1{ init1 },
+        factory2{ init2 }
+    {
+        test_sleeve();
+    }
+
+    int test_sleeve()
+    {
+        pEpLogH1("Test sleeve<" + std::string(typeid(::C99_C*).name()) + ">");
+        test_HS();
+        test_BS();
+        return 0;
+    }
+
+    int test_HS()
+    {
+        pEpLogH1("Test HS<" + std::string(typeid(::C99_C*).name()) + ">");
+        {
+            pEpLogH2("Test HS ctor");
+            LIBC99::C99_C b1{};
+            pEpLog(b1.to_string());
+            pEpLog(b1.to_string());
+        }
+        {
+            pEpLogH2("Test assign RAW-T (value)");
+            LIBC99::C99_C b1{};
+            pEpLog(b1.to_string());
+
+            ::C99_C b2 = factory2;
+
+            pEpLog(b2);
+            pEpLog(CXX::Inspect::all(b2.pi));
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            // TODO: cant test yet
+            //            TEST_IS_COPY(b2, b1);
+        }
+        {
+            pEpLogH2("Test assign HS");
+            LIBC99::C99_C b1{};
+            pEpLog(b1.to_string());
+
+            LIBC99::C99_C b2{};
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        {
+            pEpLogH2("Test assign BS");
+            LIBC99::C99_C b1{};
+            pEpLog(b1.to_string());
+
+            ::C99_C* a2 = factory1;
+            LIBC99::C99_C b2{ [&a2]() { return &a2; } };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+
+            pEpLog(b2.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        if (1   ) {
+            pEpLogH2("Test copy ctor");
+            LIBC99::C99_C b1{};
+            b1.pi = 23;
+            pEpLog(b1.to_string());
+
+            LIBC99::C99_C b2{ b1 };
+            pEpLog(b2.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        return 0;
+    }
+
+    int test_BS()
+    {
+        pEpLogH1("Test BS");
+        {
+            pEpLogH2("Test BS ctor");
+            ::C99_C* a1 = factory1;
+            LIBC99::C99_C b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+            TEST_IS_REF(a1, b1);
+        }
+        {
+            pEpLogH2("Test assign RAW-T (value)");
+            ::C99_C* a1 = factory1;
+            LIBC99::C99_C b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            ::C99_C b2 = factory2;
+
+            pEpLog(b2);
+            pEpLog(CXX::Inspect::all(b2.pi));
+
+            b1 = b2;
+
+            pEpLog(b1.to_string());
+            // TODO: cant test yet
+            //            TEST_IS_COPY(b2, b1);
+        }
+        {
+            pEpLogH2("Test assign HS");
+            ::C99_C* a1 = factory1;
+            LIBC99::C99_C b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            LIBC99::C99_C b2{};
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        {
+            pEpLogH2("Test assign BS");
+            ::C99_C* a1 = factory1;
+            LIBC99::C99_C b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            ::C99_C* a2 = factory2;
+            LIBC99::C99_C b2{ [&a2]() { return &a2; } };
+            pEpLog(b2.to_string());
+
+            b1 = b2;
+            pEpLog(b1.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+        if (0) {
+            pEpLogH2("Test copy ctor");
+            ::C99_C* a1 = factory1;
+            LIBC99::C99_C b1{ [&a1]() { return &a1; } };
+            pEpLog(b1.to_string());
+
+            LIBC99::C99_C b2{ b1 };
+            pEpLog(b2.to_string());
+            TEST_IS_REF(b1, b2);
+        }
+
+        return 0;
+    }
+
+private:
+    PODFactory<::C99_C> factory1;
+    PODFactory<::C99_C> factory2;
+};
+
+template<typename T>
+int test_sleeve(PODFactory<T> init1, PODFactory<T> init2)
+{
+    //    TestSleeve<T>{ init1, init2 };
+    TestSleeve<T*>{ init1, init2 };
+    return 0;
+}
+
+
+int main()
+{
+    //                Utils::readKey();
+    pEp::Adapter::pEpLog::set_enabled(true);
+    test_sleeve<int>(PODFactory<int>(23), PODFactory<int>(42));
+    //        test_sleeve<char>(PODFactory<char>('a'), PODFactory<char>('b'));
+    //        test_sleeve<float>(PODFactory<float>(2.3f), PODFactory<float>(4.2f));
+    //        test_sleeve<bool>(PODFactory<bool>(true), PODFactory<bool>(false));
+    //        test_sleeve<::C99_Status>(PODFactory<::C99_Status>(OK), PODFactory<::C99_Status>(ERROR));
+
+
+    //    pEpLog(CXX::Inspect::all(*a.pi));
+
+    ::C99_C a{};
+    a.i = 1;
+    a.pi = PODFactory<int>(23);
+
+    ::C99_C b{};
+    b.i = 2;
+    b.pi = PODFactory<int>(42);
+
+        test_sleeve<::C99_C>(
+            PODFactory<::C99_C>(
+                [](const ::C99_C& val) {
+                    ::C99_C* a = (::C99_C*)calloc(1, sizeof(::C99_C));
+                    a->i = PODFactory<int>(val.i);
+                    a->pi = PODFactory<int>(*val.pi);
+                    return a;
+                },
+                a),
+            PODFactory<::C99_C>(
+                [](const ::C99_C& val) {
+                    ::C99_C* a = (::C99_C*)calloc(1, sizeof(::C99_C));
+                    a->i = PODFactory<int>(val.i);
+                    a->pi = PODFactory<int>(*val.pi);
+                    return a;
+                },
+                b));
+
+    /*    {
+        ::C99_C c{};
+        c.i = 1;
+        c.pi = PODFactory<int>(23);
+
+        ::C99_B b{};
+        b.c = PODFactory<::C99_C>(c);
+
+        ::C99_A a{};
+        a.b = PODFactory<::C99_B>(b);
+    }
+    */
+    return 0;
+}

test/test_struct_cmp.cc

@@ -0,0 +1,237 @@
+#include <map>
+#include <pEp/pEpLog.hh>
+#include "pEp/inspect.hh"
+#include "../examples/libc99/libc99.h"
+#include "../src/libc99.hh"
+//#include "../src/POTS.hh"
+
+using namespace pEp;
+
+
+// This is a protoype pattern trying to make it possible to compare objects of
+// (possibly) different types.
+
+//
+
+namespace NA {
+    class ABase;
+    bool operator==(ABase& a, ABase& b);
+    bool operator!=(ABase& a, ABase& b);
+
+    class ABase {
+    public:
+        ABase() = default;
+        ABase(const std::string& name, ABase& a)
+        {
+            a.add(name, *this);
+        }
+
+        void add(const std::string& name, ABase& a)
+        {
+            _members.insert(std::pair<std::string, ABase&>(name, a));
+        }
+
+        virtual bool cmp(ABase& rhs)
+        {
+            for (std::pair<std::string, ABase&> member : _members) {
+                try {
+                    ABase& other = rhs._members.at(member.first);
+                    if (other != member.second) {
+                        return false;
+                    }
+                } catch (const std::out_of_range& e) {
+                    return false;
+                }
+            }
+            return true;
+        }
+
+    protected:
+        std::map<std::string, ABase&> _members{};
+    };
+
+
+    template<typename T>
+    class A : public ABase {
+    public:
+        A(T* obj) : _obj{ obj }
+        {
+            pEpLog("T");
+        }
+
+        A(const std::string& name, ABase& a, T* obj) : ABase(name, a), _obj{ obj } {}
+
+
+        bool cmp(ABase& rhs) override
+        {
+            if constexpr (!std::is_class<T>::value) {
+                try {
+                    A<T>& rhs_c = dynamic_cast<A<T>&>(rhs);
+                    if (*_obj == *rhs_c._obj) {
+                        return true;
+                    } else {
+                        return false;
+                    }
+                } catch (...) {
+                    try {
+                        A<T*>& rhs_c = dynamic_cast<A<T*>&>(rhs);
+                        if (*_obj == **rhs_c._obj) {
+                            return true;
+                        } else {
+                            return false;
+                        }
+                    } catch (...) {
+                        return false;
+                    }
+                }
+            } else {
+                return ABase::cmp(rhs);
+            }
+        }
+
+        //    T _value;
+        T* _obj;
+    };
+
+    template<typename T>
+    class A<T*> : public ABase {
+    public:
+        A(T** obj) : _obj{ obj }
+        {
+            pEpLog("T*");
+        }
+
+        A(const std::string& name, ABase& a, T** obj) : ABase(name, a), _obj{ obj } {}
+
+        bool cmp(ABase& rhs) override
+        {
+            if constexpr (!std::is_class<T>::value) {
+                try {
+                    A<T*>& rhs_c = dynamic_cast<A<T*>&>(rhs);
+                    if (**_obj == **rhs_c._obj) {
+                        return true;
+                    } else {
+                        return false;
+                    }
+                } catch (...) {
+                    try {
+                        A<T>& rhs_c = dynamic_cast<A<T>&>(rhs);
+                        if (**_obj == *rhs_c._obj) {
+                            return true;
+                        } else {
+                            return false;
+                        }
+                    } catch (...) {
+                        return false;
+                    }
+                }
+            } else {
+                return ABase::cmp(rhs);
+            }
+        }
+
+        //    T* _value_ptr;
+        T** _obj;
+    };
+
+    bool operator==(ABase& a, ABase& b)
+    {
+        return a.cmp(b) && b.cmp(a);
+    }
+
+    bool operator!=(ABase& a, ABase& b)
+    {
+        return !(a == b);
+    }
+
+}
+
+
+/*
+template<typename T>
+class B : public A<T> {
+public:
+    B() : A<T>()
+    {
+        pEpLog("T");
+    }
+    int _T_Bool_ext;
+};
+*/
+
+//template<typename T>
+//class A<T*, typename std::enable_if<std::is_same<T, bool>::value>::type> : public A<T*, T*> {
+//public:
+//    A()
+//    {
+//        pEpLog("T* bool");
+//    }
+//    int _Tp_Bool_ext;
+//};
+
+
+//template<>
+//class A<char*> {
+//public:
+//    A()
+//    {
+//        pEpLog("char*");
+//    }
+//
+//    char* a;
+//};
+
+struct Struct {
+    int a;
+    int b;
+};
+
+using NA::operator==;
+using NA::operator!=;
+
+int main()
+{
+    Adapter::pEpLog::set_enabled(true);
+    pEpLog("start");
+    //    A<int> i{};
+    //    A<int*> ip{};
+    //    B<int> bi{};
+    //    B<int*> bip{};
+
+    //        A<bool> b{};
+    //    A<bool*> bp{};
+    {
+        float f = 3.0f;
+        int i = 23;
+        int* pi = &i;
+        NA::A<int> a{ &i };
+        NA::A<float> b{ &f };
+        NA::A<int*> ap{ &pi };
+        assert(a != b);
+        assert(a == ap);
+    }
+    {
+        Struct a{};
+        a.a = 23;
+        a.b = 42;
+        NA::A<Struct> b1{ &a };
+        NA::A<int> b1_a{ "a", b1, &a.a };
+        NA::A<int> b1_b{ "b", b1, &a.b };
+
+        NA::A<Struct> b2{ &a };
+        NA::A<int> b2_a{ "a", b2, &a.a };
+        NA::A<int> b2_b{ "b", b2, &a.b };
+
+        assert(b1 == b2);
+
+        Struct a2{};
+        a2.a = 23;
+        a2.b = 42;
+
+        NA::A<Struct> b3{ &a2 };
+        NA::A<int> b3_a{ "a", b3, &a2.a };
+        NA::A<int> b3_b{ "b", b3, &a2.b };
+
+        assert(b2 == b3);
+    }
+}

test_old/Makefile

@@ -0,0 +1,23 @@
+include ../Makefile.conf
+
+LDFLAGS=-L../src_old -L$(PREFIX)/lib -L$(PREFIX_GTEST)/lib
+LDLIBS=-lstdc++ -lpEpCxx11 -lpEpEngine -lpEpAdapter
+CXXFLAGS:=-I../src_old $(CXXFLAGS) -I$(PREFIX_GTEST)/include
+
+TEST_SOURCE=$(wildcard *.cc)
+TEST_OBJECTS=$(subst .cc,.o,$(TEST_SOURCE))
+
+.PHONY: all, clean
+
+all: unittests
+
+unittests: $(TEST_OBJECTS) ../src_old/libpEpDatatypes.a
+	$(CXX) $(LDFLAGS) -o $@ $^ $(LDLIBS) -lgtest -lgtest_main
+
+
+
+
+clean:
+	rm -f unittests
+	rm -Rf *.dSYM
+	rm -f *.o

test/unittest_identity.cc → test_old/unittest_identity.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/types.hh"
+#include "../src_old/types.hh"
 
 
 TEST(PepIdentity, Simple)

test/unittest_message.cc → test_old/unittest_message.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/types.hh"
+#include "../src_old/types.hh"
 
 namespace {
     static const char*

test/unittest_nfc.cc → test_old/unittest_nfc.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/nfc.hh" // for illegal_utf8 exception
+#include "../src_old/nfc.hh" // for illegal_utf8 exception
 #include <vector>
 
 using namespace pEp;

test/unittest_nfc16.cc → test_old/unittest_nfc16.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/nfc.hh" // for illegal_utf8 exception
+#include "../src_old/nfc.hh" // for illegal_utf8 exception
 #include <vector>
 
 using namespace pEp;

test/unittest_nfcstring.cc → test_old/unittest_nfcstring.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/nfc.hh" // for illegal_utf8 exception
+#include "../src_old/nfc.hh" // for illegal_utf8 exception
 #include <vector>
 
 using namespace pEp;

test/unittest_stringlist.cc → test_old/unittest_stringlist.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/types.hh"
+#include "../src_old/types.hh"
 
 
 TEST(StringList, Simple)

test/unittest_stringpair.cc → test_old/unittest_stringpair.cc

@@ -1,6 +1,6 @@
 #include <gtest/gtest.h>
 
-#include "../src/types.hh"
+#include "../src_old/types.hh"
 
 typedef pEp::StringPair SP;