Method message

include/ylt/struct_pack/error_code.hpp:61–63

  constexpr operator bool() const noexcept { return ec != errc::ok; }
  constexpr int val() const noexcept { return static_cast<int>(ec); }
  constexpr std::string_view message() const noexcept {
    return detail::make_error_message(ec);
  }
};

namespace detail {