Add example library code

src/hello_world.cc

@@ -0,0 +1,29 @@
+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#include "hello_world.hh"
+
+namespace pEp {
+    namespace HelloWorld {
+        //non-template func and template-specializations here
+        std::string hello_world()
+        {
+            return "hello world";
+        }
+
+        // specialization for int
+        template<>
+        int hello_world(int param1)
+        {
+            return param1 * 2;
+        }
+
+        // specialization for float
+        template<>
+        double hello_world(double param1)
+        {
+            return param1 * 2;
+        }
+
+    } // namespace HelloWorld
+} // namespace pEp

src/hello_world.hh

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+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#ifndef LIBPEPHELLOWORLD_HELLO_WORLD_HH
+#define LIBPEPHELLOWORLD_HELLO_WORLD_HH
+
+#include <string>
+
+namespace pEp {
+    namespace HelloWorld {
+        // non-template functions and classes
+        // impl in .cc
+        std::string hello_world();
+
+        // template functions and classes
+        // impl in .hxx
+        template<typename T>
+        T hello_world(T param1);
+    } // namespace HelloWorld
+} // namespace pEp
+
+#include "hello_world.hxx"
+
+#endif // LIBPEPHELLOWORLD_HELLO_WORLD_HH

src/hello_world.hxx

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+// This file is under GNU General Public License 3.0
+// see LICENSE.txt
+
+#ifndef LIBPEPHELLOWORLD_HELLO_WORLD_HXX
+#define LIBPEPHELLOWORLD_HELLO_WORLD_HXX
+
+#include <sstream>
+
+namespace pEp {
+    namespace HelloWorld {
+        template<typename T>
+        T hello_world(T param1)
+        {
+            return param1;
+        }
+    } // namespace HelloWorld
+} // namespace pEp
+
+#endif //LIBPEPHELLOWORLD_HELLO_WORLD_HXX