jehelset 6a775e9560 Add support for 'std::variant' in C++17 (#2941) ...

Add support for 'std::variant' in C++17.

For C++17, if all the alternatives of a variant are formattable
the variant is now also formattable. In addition 'std::monostate'
is now formattable.

Moves implementation into 'std.h', and tests into 'std-test.cc'.

Avoid fold-expression since MSVC was crashing.

Add section for 'fmt/std.h' in API-docs.

2022-06-26 07:28:01 -07:00

24 KiB

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