It is preferable to separate implementation and specification in software.Hence,it is preferable to place a template class definition in a "header" file,the template implementation of the member functions in an implementation file.The implementation should be compiled separately and linked to the application.

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Quizplus · Accepted Answer

Template definitions, including their implementations, should be placed in header files because templates are compiled when instantiated, and the compiler needs to see the implementation at the point of instantiation. Separating the template definition from its implementation into different files and trying to compile them separately would lead to linker errors, as the compiler would not be able to instantiate the templates without seeing their implementations.

It Is Preferable to Separate Implementation and Specification in Software