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

.gitignore

@@ -13,3 +13,4 @@ build/
 /examples/libc99/libc99.so
 /test/test_identity
 /test/.pEp/
+/test/test_sleeve

examples/libc99/libc99.h

@@ -62,7 +62,8 @@ extern "C" {
     // T*
     C99_Status c99_supply_basic(int* basic);
     C99_Status c99_supply_struct(C99_A* a);
-    C99_Status c99_supply_string(char** c_str);
+    // Not valid
+    //    C99_Status c99_supply_string(char** c_str);
 
     // provide
     // in parm, ownership goes to callee

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

@@ -133,31 +133,15 @@ namespace pEp {
     // Thats the only difference.
     class String {
     public:
-        String()
-        {
-            pEpLogClass("called");
-        }
-
         // Best to use this constructor, as the object is in a valid state when the wrapped
         // c_str (char*) is known
-        String(bool is_owner, char** c_str_pp)
+        String(char** c_str_pp)
         {
-            bind(is_owner, c_str_pp);
-        }
-
-        String(bool is_owner, char** c_str_pp, const std::string& init_val)
-        {
-            bind(is_owner, c_str_pp, init_val);
-        }
-
-        void bind(bool is_owner, char** c_str_pp, const std::string& init_val)
-        {
-            bind(is_owner, c_str_pp);
-            this->operator=(init_val);
+            bind(c_str_pp);
         }
 
         // bind and set ownership
-        void bind(bool is_owner, char** c_str_pp)
+        void bind(char** c_str_pp)
         {
             if (c_str_pp == nullptr) {
                 throw Exception{ EXSTR("cant bind on a nullptr") };
@@ -168,13 +152,12 @@ namespace pEp {
             }
 
             // init
-            _c_str_pp = c_str_pp;
+            _target = c_str_pp;
             _is_bound = true;
             pEpLogClass(to_string());
-            set_owner(is_owner);
 
             //if the c_str_p is nullptr then init with ""
-            if (*_c_str_pp == nullptr) {
+            if (*_target == nullptr) {
                 this->operator=("");
             }
         }
@@ -182,7 +165,7 @@ namespace pEp {
         ~String()
         {
             if (_is_owner) {
-                _free(*_c_str_pp);
+                _free(*_target);
             }
         }
 
@@ -190,15 +173,15 @@ namespace pEp {
         String& operator=(const std::string& str)
         {
             pEpLogClass("Before: " + to_string() + " - new val: '" + pEp::Utils::clip(str, 30) + "'");
-            if (_c_str_pp == nullptr) {
+            if (_target == nullptr) {
                 throw Exception{ EXSTR("invalid state") };
             }
 
             // DEALLOCATION
-            _free(*_c_str_pp);
+            _free(*_target);
 
             // ALLOCATION
-            *_c_str_pp = _copy(str);
+            *_target = _copy(str);
             pEpLogClass("After:  " + to_string());
             return *this;
         }
@@ -206,29 +189,53 @@ namespace pEp {
         // return a copy of whatever c_str currently is (maybe created by us, maybe changed meanwhile)
         operator std::string() const
         {
-            if (_c_str_pp == nullptr) {
+            if (_target == nullptr) {
                 throw Exception{ EXSTR("invalid state") };
             }
 
-            if (*_c_str_pp != nullptr) {
-                return { *_c_str_pp };
+            if (*_target != nullptr) {
+                return { *_target };
             }
             return {};
         }
 
-        char** data()
+        const char* c_data() const
         {
-            return _c_str_pp;
+            if (_target == nullptr) {
+                throw Exception{ EXSTR("invalid state") };
+            }
+            return *_target;
         }
 
-        const char* c_data() const
+        char* data()
         {
-            if (_c_str_pp == nullptr) {
+            if (_target == nullptr) {
                 throw Exception{ EXSTR("invalid state") };
             }
-            return *_c_str_pp;
+            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());
@@ -242,12 +249,12 @@ namespace pEp {
         std::string to_string() const
         {
 
-            if (_c_str_pp == nullptr) {
+            if (_target == nullptr) {
                 throw Exception{ EXSTR("invalid state") };
             }
 
-            std::string ret{ "[" + CXX::Inspect::all(_c_str_pp) + " / " +
-                             CXX::Inspect::all(*_c_str_pp) + "]" };
+            std::string ret{ "[" + CXX::Inspect::all(_target) + " / " +
+                             CXX::Inspect::all(*_target) + "]" };
             return ret;
         }
 
@@ -278,9 +285,9 @@ namespace pEp {
             ::pEp_free(ptr_type);
         }
 
+        bool _is_owner{ true };
         bool _is_bound{ false };
-        bool _is_owner{ false };
-        char** _c_str_pp{ nullptr };
+        char** _target{ nullptr };
 
         Adapter::pEpLog::pEpLogger logger{ "pEp::String", log_enabled };
         Adapter::pEpLog::pEpLogger& m4gic_logger_n4me = logger;
@@ -304,165 +311,366 @@ namespace pEp {
     // 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 PODStruct {
+    class Sleeve : public BasicSleeve {
     public:
-        PODStruct() = delete;
+        // 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");
+        }
 
-        // Creates a new instance or binds an existing one
-        PODStruct(bool is_owner, T** c_struct_pp = nullptr)
+        // Assignment
+        // ----------
+        // takes a copy
+        Sleeve<T>& operator=(const Sleeve<T>& rhs)
         {
             pEpLogClass("called");
-            _init(is_owner, c_struct_pp);
+            *obj_ptr() = rhs._obj;
+            return *this;
         }
 
-        // Creates a new instance or binds an existing one
-        // but takes custom alloc/free functions
-        PODStruct(
-            bool is_owner,
-            std::function<T*()> alloc,
-            std::function<void(T*)> free,
-            T** c_struct_pp = nullptr) :
-            _effective_alloc(std::move(alloc)),
-            _effective_free(std::move(free))
+        // assign the binding
+        Sleeve<T>& operator=(const T& rhs)
         {
-            _init(is_owner, c_struct_pp);
+            pEpLogClass("called");
+            *obj_ptr() = rhs;
+            return *this;
         }
 
-        void bind(bool is_owner, T** c_struct_pp)
+        // Comparison
+        // ----------
+        // value comparison
+        bool operator==(const Sleeve<T>& rhs) const
         {
-            if (c_struct_pp == nullptr) {
-                throw Exception{ EXSTR("cant bind on a nullptr") };
-            }
+            pEpLogClass("called");
+            return *const_cast<Sleeve<T>*>(this)->obj_ptr() == *const_cast<Sleeve<T>&>(rhs).obj_ptr();
+        }
 
-            if (_is_bound) {
-                throw Exception{ EXSTR("can only bind once") };
-            }
+        bool operator==(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return *const_cast<Sleeve<T>*>(this)->obj_ptr() == rhs;
+        }
 
-            // init
-            _c_struct_pp = c_struct_pp;
-            _c_struct_p = *_c_struct_pp;
-            _is_bound = true;
-            pEpLogClass(to_string());
-            set_owner(is_owner);
+        //        bool operator!=(const Sleeve<T>& rhs) const
+        //        {
+        //            pEpLogClass("called");
+        //            return !operator==(rhs);
+        //        }
+
+        bool operator!=(const T& rhs) const
+        {
+            pEpLogClass("called");
+            return !operator==(rhs);
         }
 
-        ~PODStruct()
+        // object comparison
+        bool is(const Sleeve<T>& rhs) const
         {
-            if (_is_owner) {
-                _effective_free(_c_struct_p);
-            }
+            pEpLogClass("called");
+            return id() == rhs.id();
         }
 
-        T** data()
+        bool is(const T& rhs) const
         {
-            return _c_struct_pp;
+            pEpLogClass("called");
+            return const_cast<Sleeve<T>*>(this)->obj_ptr() == &rhs;
         }
 
-        const T* c_data() const
+        // Accessors
+        // ---------
+        // Access the object data r/w
+        T data()
         {
-            if (_c_struct_pp == nullptr) {
-                throw Exception{ EXSTR("invalid state") };
-            }
-            return *_c_struct_pp;
+            pEpLogClass("called");
+            return *obj_ptr();
         }
 
-        operator T*()
+        // Access the object data r/w
+        operator T()
         {
-            return _c_struct_p;
+            pEpLogClass("called");
+            return *obj_ptr();
         }
 
-        std::string to_string() const
+        // Access the object pointer r/w
+        T* obj_ptr()
         {
-            std::string ret{ "[" + CXX::Inspect::all(_c_struct_p) + "]" };
+            //            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;
         }
 
-        void set_owner(bool is_owner)
+        //        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(std::to_string(is_owner));
-            _is_owner = is_owner;
+            pEpLogClass("new");
         }
 
-        bool is_owner() const
+        //Create a sleeve managing a C - sleeve explicit
+        Sleeve(T** target) :
+            _target(target),
+            _obj{ nullptr },
+            _sptr{ *_target, std::bind(&Sleeve::_free_wrapper, this) }
         {
-            return _is_owner;
+            pEpLogClass("called");
         }
 
-        static bool log_enabled;
+        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();
+        }
 
-        Adapter::pEpLog::pEpLogger logger{ typeid(T).name(), log_enabled };
+        // 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;
 
-    private:
-        const std::function<T*()> _effective_alloc{ std::bind(&PODStruct::_alloc, this) };
+
+        const std::function<T*()> _effective_alloc{ std::bind(&Sleeve::_default_alloc, this) };
         const std::function<void(T*)> _effective_free{
-            std::bind(&PODStruct::_free, this, std::placeholders::_1)
+            std::bind(&Sleeve::_default_free, this, std::placeholders::_1)
         };
 
-        bool _is_bound{ false };
-        bool _is_owner{ false };
-        T** _c_struct_pp{ nullptr };
-        T* _c_struct_p{ nullptr };
-
-        void _init(bool is_owner, T** c_struct_pp)
-        {
-            // if no pp is given, alloc new,
-            // otherwise bind to it
-            if (!c_struct_pp) {
-                _c_struct_p = _effective_alloc();
-                bind(is_owner, &_c_struct_p);
-            } else {
-                bind(is_owner, c_struct_pp);
-            }
-        }
+        // 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
+        // -----------------------------------
 
-        // default alloc/free
-        T* _alloc()
+        T* _default_alloc()
         {
             T* ret = (T*)calloc(1, sizeof(T));
             pEpLogClass(CXX::Inspect::all(ret));
             return ret;
         }
 
-        void _free(T* ptr)
+        void _default_free(T* ptr)
         {
             pEpLogClass(CXX::Inspect::all(ptr));
             free(ptr);
         }
 
-        class Exception : public std::runtime_error {
-        public:
-            explicit Exception(const std::string& msg) : std::runtime_error(msg) {}
-        };
+        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());
+            }
+        }
     };
 
-    //---------------------------------------------------------------------------------------------
-    // 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.
+
+    //    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 TestStruct1 : public PODStruct<::Test_struct1> {
+    //---------------------------------------------------------------------------------------------
+    class C : public Sleeve<::C99_C*> {
     public:
-        TestStruct1(bool is_owner, ::Test_struct1** test_struct1_p = nullptr) :
-            PODStruct<::Test_struct1>(is_owner, test_struct1_p)
-        {
-        }
-
-        // fields of the struct as 'properties' ;)
-        pEp::POD<int> c_int{ &(*data())->c_int };
-        pEp::POD<::Test_enum> c_enum{ &(*data())->c_enum };
-        pEp::String c_str{ is_owner(), &(*data())->c_str };
+        // 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;
+        //                             } };
     };
 
-    template<>
-    bool PODStruct<::Test_struct1>::log_enabled{ false };
+
+    //    // ------------------------------------------------------------------------------------------
+    //    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/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

@@ -8,20 +8,16 @@
 
 //---------------------------------------------------------------------------------------------
 namespace pEp {
-    class Identity : public PODStruct<::pEp_identity> {
+    class Identity : public Sleeve<::pEp_identity> {
     public:
-        Identity(bool is_owner, ::pEp_identity** ident_p = nullptr) :
-            PODStruct<::pEp_identity>(is_owner, ident_p)
-        {
-        }
+        Identity(::pEp_identity** ident_p = nullptr) : PODStruct<::pEp_identity>(ident_p) {}
 
         Identity(
-            bool is_owner,
             const std::string& address = "",
             const std::string& username = "",
             const std::string& user_id = "",
             const std::string& fpr = "") :
-            PODStruct<::pEp_identity>(is_owner, nullptr)
+            Sleeve<::pEp_identity>(nullptr)
         {
             pEpLogClass("called");
             this->address = address;
@@ -30,21 +26,20 @@ namespace pEp {
             this->fpr = fpr;
         }
 
-        pEp::String address{ is_owner(), &(*data())->address };
-        pEp::String fpr{ is_owner(), &(*data())->fpr };
-        pEp::String user_id{ is_owner(), &(*data())->user_id };
-        pEp::String username{ is_owner(), &(*data())->username };
-        pEp::POD<::PEP_comm_type> comm_type{ &(*data())->comm_type };
+        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 };
+        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 PODStruct<::pEp_identity>::log_enabled{ false };
+    bool Sleeve<::pEp_identity>::log_enabled{ false };
 
 } // namespace pEp
 
@@ -56,20 +51,21 @@ int main()
     ::init(&session, nullptr, nullptr, nullptr);
 
     // create identity
-    pEp::Identity id1{ true, "wrong@entry.lol", "wrong", "23", "INVA_FPR" };
+    pEp::Identity id1{ "wrong@entry.lol", "wrong", "23", "INVA_FPR" };
 
-    pEpLog(id1);
+    pEpLog(id1.c_data());
     id1.username = "alice";
     id1.address = "alice@peptest.org";
+    id1.
 
     pEpLog(id1.address);
     pEpLog(id1.username);
     ::myself(session, id1);
-    pEpLog(id1);
+    pEpLog(id1.c_data());
 
-    pEp::Identity id2{ true, "bob" };
+    pEp::Identity id2{ "bob" };
     ::update_identity(session, id2);
-    pEpLog(id2);
+    pEpLog(id2.c_data());
 
     return 0;
 }

test/test_nr1.cc

@@ -1,247 +0,0 @@
-#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.data() == 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.data()));
-        assert(std::string(*pstr.data()) == std::string(*c_str_p));
-        assert(std::string(*pstr.data()) == 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);
-    }
-}
-
-
-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<::Test_enum>::value && !std::is_pointer<::Test_enum>::value,
-        "not an integral");
-    static_assert(
-        std::is_pod<::Test_struct1>::value && !std::is_pointer<::Test_struct1>::value,
-        "not an integral");
-
-    //    pEp::Utils::readKey();
-    pEp::Adapter::pEpLog::set_enabled(true);
-
-    // POD
-    if (1) {
-        // 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 (1) {
-        //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
-        // new pEp::String on char* pointing to NULL
-        {
-            pEpLogH1("new pEp::String on char* pointing to NULL");
-            char* c_str = NULL; // nullptr
-
-            pEp::String pstr(true, &c_str);
-            test_getters(&c_str, pstr, "");
-            test_assign(&c_str, pstr);
-        }
-
-        std::string init_val{ "initialized c string" };
-        // new pEp::String on already initalized char*
-        {
-            pEpLogH1("new pEp::String on already initalized char*");
-            char* c_str = strdup(init_val.c_str());
-
-            pEp::String pstr(true, &c_str);
-            test_getters(&c_str, pstr, init_val);
-            test_assign(&c_str, pstr);
-        }
-
-        // bind()
-        {
-            pEpLogH1("bind()");
-            pEp::String pstr{};
-
-            char* c_str = strdup(init_val.c_str());
-            //TODO: PITYASSERT_THROWS
-            pstr.bind(true, &c_str);
-            test_getters(&c_str, pstr, init_val);
-            test_assign(&c_str, pstr);
-        }
-
-        // equality operator
-        {
-            pEpLogH1("equality operator");
-            pEp::String pstr1{};
-
-            char* c_str1 = strdup(init_val.c_str());
-            char* c_str2 = strdup(init_val.c_str());
-            pstr1.bind(true, &c_str1);
-            pEp::String pstr2{ true, &c_str2 };
-            assert(pstr1 == pstr2);
-            pstr2 = "huhu";
-            assert(pstr1 != pstr2);
-        }
-    }
-
-    // Struct
-    if (1) {
-        // create an instance
-        if (1) {
-            pEp::TestStruct1 pstruct1{ true };
-            //            pEp::TestStruct1 pstruct1(true, 23, TWO, "pEp");
-            pEpLog(pstruct1.c_int);
-            pEpLog(pstruct1.c_enum);
-            pEpLog(pstruct1.c_str);
-
-            ::Test_struct1* c_struct1 = pstruct1;
-            pEpLog(c_struct1->c_int);
-            pEpLog(c_struct1->c_enum);
-            pEpLog(c_struct1->c_str);
-            pEpLog("DONE");
-        }
-
-        // wrap already existing instance
-        {
-            ::Test_struct1* c_struct1 = ::new_test_struct(0, ONE, "pEp");
-            pEpLog(c_struct1->c_int);
-            pEpLog(c_struct1->c_enum);
-            pEpLog(c_struct1->c_str);
-            pEpLog("DONE");
-
-            pEp::TestStruct1 pstruct1(true, &c_struct1);
-            pEpLog(pstruct1.c_int);
-            pEpLog(pstruct1.c_enum);
-            pEpLog(pstruct1.c_str);
-            pEpLog("DONE");
-        }
-    }
-}

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);
+    }
+}