For example

//temp.h
class ABC
{
  pubilc: void temp(T &a);
};

//temp.cpp( )
void ABc<T>::temp(T &a){} //defination ( it should be in header file?????????)
template class ABC<int>;

//main.cpp
int main()
{
  int i=10;
  ABC<int> a;
  a.temp(i);
return 0;
}