Method base

include/boost/parser/parser.hpp:8504–8508

            parses digits as base-`Radix2` instead of base-`Radix`. */
        template<int Radix2>
        constexpr auto base() const noexcept
        {
            return int_parser<T, Radix2, MinDigits, MaxDigits, Expected>{
                expected_};
        }

        /** Returns an `int_parser` identical to `*this`, except that it only
            accepts numbers exactly `Digits` digits. */