Jonathan Gopel aa9b09a9e3 🐛 Cannot call non-constexpr function in constexpr context (#2010) ...

Problem:
- gcc-8 gives the following error when compiling this function on all
  standards:
    test/std-format-test.cc: In member function 'constexpr auto std::formatter<S>::parse(std::format_parse_context&)':
    test/std-format-test.cc:112:17: error: call to non-'constexpr' function 'int isdigit(int)'
        if (!isdigit(c) || (++iter, get_char()) != '}')
         ~~~~~~~^~~

Solution:
- Write a `constexpr` version of `isdigit` for use in this function.

Co-authored-by: Jonathan Gopel <jgopel@quantlab.com>

2020-11-12 10:10:52 -08:00

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