gistfile1.cpp

#include <iostream>
#include <typeinfo>

//#define SFML_SYSTEM_MACOS

#if defined(SFML_SYSTEM_MACOS) || defined(SFML_SYSTEM_IOS)
    typedef void* NativeHandleType;
#else
    typedef unsigned int NativeHandleType;
#endif

typedef unsigned int GLEXT_GLhandle;

template <class T>
GLEXT_GLhandle castToGlHandle(T handle) {
    std::cout << "castToGlHandle(T handle)" << std::endl;
    return 0;
}

template <>
GLEXT_GLhandle castToGlHandle(void* handle) {
    std::cout << "castToGlHandle(void* handle)" << std::endl;
    return 1;
}

template <class T>
T castFromGlHandle(GLEXT_GLhandle handle) {
    std::cout << "unsigned int castFromGlHandle()" << std::endl;
    return 0;
}

template <>
void* castFromGlHandle(GLEXT_GLhandle handle) {
    std::cout << "void* castFromGlHandle()" << std::endl;
    return 0;
}

int main() {
    unsigned int uint;
    void* vptr;
    GLEXT_GLhandle handle;

    std::cout << castToGlHandle(uint) << std::endl;
    std::cout << castToGlHandle(vptr) << std::endl;
    std::cout << castFromGlHandle<NativeHandleType>(handle) << std::endl;
}