Method isNullTerminated

CvPlot/ext/catch2/inc/catch.hpp:645–647

        auto data() const noexcept -> char const*;

        constexpr auto isNullTerminated() const noexcept -> bool {
            return m_start[m_size] == '\0';
        }

    public: // iterators
        constexpr const_iterator begin() const { return m_start; }