This is a simple C++ header file to allow outputting of C++ containers.
It is generic and can work with any container that has begin and end
member functions. It avoids conflicts with existing output functions
(like that for std::string) by detecting whether they can be used.
You may want to check out output_range as well, which is a natural extension of output_container, supporting not only containers, but also ranges like a C array or other C++20 ranges.
Using this file requires a C++17-compliant compiler.