cpp
https://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file
https://stackoverflow.com/questions/5612791/c-template-and-header-files
https://www.bogotobogo.com/cplusplus/template_declaration_definition_header_implementation_file.php
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https://stackoverflow.com/questions/495021/why-can-templates-only-be-implemented-in-the-header-file
https://stackoverflow.com/questions/5612791/c-template-and-header-files
https://www.bogotobogo.com/cplusplus/template_declaration_definition_header_implementation_file.php