constexpr decltype()

in src/libraries/io/include/m/io/units.h [116:126]

• 9 lines of code
• 3 McCabe index (conditional complexity)

    constexpr decltype(auto)
    parse(ParseContext& ctx)
    {
        auto       it  = ctx.begin();
        auto const end = ctx.end();

        if (it != end && *it != '}')
            throw std::format_error("Invalid format string");

        return it;
    }