Method fixed_string

include/fmt/format.h:968–971

namespace detail {
template <typename Char, size_t N> struct fixed_string {
  FMT_CONSTEXPR fixed_string(const Char (&s)[N]) {
    detail::copy<Char, const Char*, Char*>(static_cast<const Char*>(s), s + N,
                                           data);
  }
  Char data[N] = {};
};