[zNinja]

Hello, I have a class which has template function members.
When I define body of template member in class declaration all is ok at compile time,
but if I want to declare template member outside the class in cpp file i get error at compile time.
"undefined reference to `void* ModulFuncLoader::execute<void*>(void*, char const*, void*)'|"


ModulFuncLoader.h

PHP Code


<?php 
#ifndef MODULFUNCLOADER_H
#define MODULFUNCLOADER_H
#include <windows.h>
#include <vector>

typedef void* (*_main0)();
typedef void* (*_main1)(void*);
typedef void* (*_main2)(void*,void*);
typedef void* (*_main3)(void*,void*,void*);
typedef void* (*_main4)(void*,void*,void*,void*);
typedef void* (*_main5)(void*,void*,void*,void*,void*);
typedef void* (*_main6)(void*,void*,void*,void*,void*,void*);
typedef void* (*_main7)(void*,void*,void*,void*,void*,void*,void*);

#define mn(n) _main##n

class ModulFuncLoader
{
    public:
        ModulFuncLoader(const char* lib_path);
        virtual ~ModulFuncLoader();
        template<class T>
        T execute(T t,const char* func){
       //if(!lib) throw exception
    mn(0) __main = (mn(0))GetProcAddress(lib,func);
    if(__main)
    return __main();
    return NULL;// should throw exception instead
}
template<class T>
T execute(T t,const char* func,void*);
    protected:
    private:
        HMODULE lib;

};

#endif // MODULFUNCLOADER_H 


ModulFuncLoader.cpp

PHP Code


<?php 
#include "ModulFuncLoader.h"
ModulFuncLoader::ModulFuncLoader(const char* lib_path)
{
    lib  = LoadLibrary(lib_path);
}

ModulFuncLoader::~ModulFuncLoader()
{
    if(lib)
    FreeLibrary(lib);
}

template<class T>
T ModulFuncLoader::execute(T t,const char* func, void*p1)
{
//if(!lib) throw exception
    mn(1) __main = (mn(0))GetProcAddress(lib,func);
    if(__main)
    return __main(p1);
    return NULL;// should throw exception instead
} 


main.cpp

PHP Code


<?php 
#include "ModulFuncLoader.h"

int main()
{

    ModulFuncLoader m("c512.dll");
    void* t = NULL;
    m.execute(t,"alert"); // can compile
    m.execute(t,"alert",(void*)"test"); // can not compile 

    return 0;
} 


I can declare for single type like this in cpp file

PHP Code


<?php 
template<>
int ModulFuncLoader::execute(int t,const char* func, void* p1){

// code
} 


But do I must to do it for every type or I can do some less complicated way?

[0xDEAD10CC]

You can simply put your template definitions in the header file instead of your source file. Otherwise you need to explicitly define them.