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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;
    intManager.Add(test);

    return 0;
}

resourcemanager.h

#include<vector>
using namespace std;


template <class T>
class cResourceManager
{
    public:
        cResourceManager(){};
        void Add(T value);


    private:
        vector<T> ResourceList;
};

resourcemanager.cpp
#include "resourcemanager.h"


template<class T>
void cResourceManager<T>::Add(T value)
{
    ResourceList.push_back(value);
}

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