Template definitions outside class body

Question

Is it O.K. to define virtual function of class template outside its body? Virtual function can not be inlined, but to avoid multiple definitions in compilation units they sh

Answer 1

You can define the functions there, as long as any code which needs to instantiate the function in question has visibility of that code at compile time (not link time).

It's quite common to separate a template into 2 files, one being a traditional header, and the second being the implementation, as with non-templated functions and their implementation. The only difference is that you need to #include the template implementation file as well as the header when you want to use it.