Defining methods of class template

[marax27]

Hello. I'm trying to create a class template, but I cannot define its methods outside header file.

mtse.h:

template<typename T> class Stack
{
...
~Stack();
void push(const T &x);
...
};

mtse.cpp:

#include "mtse.h"
template<typename T> Stack<T>::~Stack()
{...}
template<typename T> void Stack<T>::push(const T &x)
{...}

Unfortunately, linker complains about "undefined reference to Stack<float>::push(float const&)" etc. Where is the problem?

[TheIdeasMan]

Hi,

Templates have to be fully defined in the header file*. But read this:

https://isocpp.org/wiki/faq/templates#templates-defn-vs-decl


Hope this helps :+)

Btw, I use *.hpp for header files, it means a header file with c++ code in it, as opposed to a C header file. It's a bit pedantic, it doesn't seem to make much difference.

[marax27]

Thanks! I defined functions in the header file, and everything works fine.