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class template question

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i've made a very simple program in an attempt to try and use class templates and i keep getting this linker error when i compile: main.obj : error LNK2001: unresolved external symbol "public: void __thiscall cResourceManager<int>::Add(int)" (?Add@?$cResourceManager@H@@QAEXH@Z) it's probably something very simple im missing (thats what i get for being up at 4am) but can anyone enlighten me? thanks in advance heres my source main.cpp
#include "resourcemanager.h"

int main()

    cResourceManager<int> intManager;
    int test=232;

    return 0;


using namespace std;

template <class T>
class cResourceManager
        void Add(T value);

        vector<T> ResourceList;

#include "resourcemanager.h"

template<class T>
void cResourceManager<T>::Add(T value)

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