Method fixed_string

include/fmt/format.h:1002–1004

#if FMT_USE_NONTYPE_TEMPLATE_ARGS
template <typename Char, size_t N> struct fixed_string {
        constexpr fixed_string(const Char (&str)[N]) {
            detail::copy_str<Char, const Char*, Char*>(static_cast<const Char*>(str), str + N, data);
        }

        Char data[N] = {};
};