Getting Linker error while instantiating a template class - c++

Question

While instantiating the class in main I am getting these two errors:
error LNK2019: unresolved external symbol "public: __thiscall templateClass<int>::templateClass<int>(void)" (??0?$templateClass#H##QAE#XZ) referenced in function _wmain
error LNK2019: unresolved external symbol "public: __thiscall templateClass<int>::~templateClass<int>(void)" (??1?$templateClass#H##QAE#XZ) referenced in function _wmain
Code
templateClass.h
#pragma once
#define MAX 10
template<class T>
class templateClass
{
private:
T arr[MAX];
int size;
public:
templateClass(void);
void initArrayWithZero();
void pushElementIntoArray(T element );
void printArray();
~templateClass(void);
};
templateclass.c
#include "templateClass.h"
template <class T>
templateClass<T>::templateClass(void)
{
size = 0;
}
template <class T>
templateClass<T>::~templateClass(void)
{
}
template <class T>
void templateClass<T>::pushElementIntoArray(T element )
{
if(size<MAX)
{
T[size++] = element;
}
else
{
//Give error code
}
}
template <class T>
void templateClass<T>::initArrayWithZero()
{
for(i= 0; i<MAX; i++)
T[i] = 0;
}
template <class T>
void templateClass<T>::printArray()
{
for( int i =0; i<MAX; i++)
cout<<"\n"T[i];
}
Main.cpp
#include "stdafx.h"
#include "templateClass.h"
int _tmain(int argc, _TCHAR* argv[])
{
templateClass<int> intarray;
return 0;
}
How can I fix this?

Answer 1

Template classes such as templateClass<T> must (usually) be implemented in header (.h) files.
As such, you need to move the content of templateclass.c to templateClass.h and delete templateclass.c.
See Why can templates only be implemented in the header file? for more information.