C++ template, linking error

Question

(This question already has answers here): question from:https://stackoverflow.com/questions/1353973/c-template-linking-error

Answer 1

Template functions, including member functions, must be written entirely in the header files. This means that if you have a template class, its implementation must be entirely in a header file. This is because the compiler needs to have access to the entire template definition (not just the signature) in order to generate code for each instantiation of the template.