research-note/hpp-cpp-template-class

Separate the C++ template Class declaration and implementation by hpp and cpp.

Template Class with .hpp + .cpp

Do not contain Grid.cpp.

Test with C++20 with clang++-12.

 $ clang++-12 -lstdc++ -std=c++20 main.cpp Grid.hpp

I was referring to contents of Professional C++ Chapter 12.

So I modify the example a little by myself.