nowindowsh

//          Copyright John R. Bandela 2012.
// Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//          http://www.boost.org/LICENSE_1_0.txt)

#include <cstddef>
#include <string>

// On Windows use stdcall
#define CROSS_CALL_CALLING_CONVENTION __stdcall



namespace cross_compiler_interface{

    namespace detail{
        // Define Win32 functions so we will not have to include windows.h for 3 functions
        namespace Windows{
            struct WindowsMODULE{
                int unused;
            };
            typedef WindowsMODULE* WindowsHModule;
            extern "C"{
                __declspec(dllimport) 
                    WindowsHModule
                    __stdcall
                    LoadLibraryA(
                    const char* lpLibFileName
                    );

                typedef int (__stdcall  *Proc)();
                __declspec(dllimport)
                    Proc
                    __stdcall
                    GetProcAddress(
                    WindowsHModule hModule,
                    const char* lpProcName
                    );

                __declspec(dllimport)
                    int
                    __stdcall
                    FreeLibrary(
                    WindowsHModule hLibModule
                    );

            }
        }
    }
    class module{

        detail::Windows::WindowsHModule m_;

        // Not copyable
        module(const module&);
        module& operator=(const module&);
    public:
        module(std::string m){
            // add a .dll extension
            m += ".dll";
            m_ = detail::Windows::LoadLibraryA(m.c_str());
            if(!m_){
                throw error_unable_to_load_library();
            }


        };

        template<class F>
        F load_module_function(std::string func)const{
            auto f = reinterpret_cast<F>(detail::Windows::GetProcAddress(m_, func.c_str()));
            if(!f){
                throw error_shared_function_not_found();
            }

            return f;
        }

        ~module(){
            detail::Windows::FreeLibrary(m_);
        };
    };

}