Function RangeOk

util/string/ascii.h:45–53

    template <class T>
    bool RangeOk(T c) noexcept {
        static_assert(std::is_integral<T>::value, "Integral type character expected");

        if (sizeof(T) == 1) {
            return true;
        }

        return c >= static_cast<T>(0) && c <= static_cast<T>(127);
    }

#ifndef TSTRING_IS_STD_STRING
    template <class String>