Method Compact

src/streams.h:247–251

    const value_type* data() const                   { return vch.data() + m_read_pos; }

    inline void Compact()
    {
        vch.erase(vch.begin(), vch.begin() + m_read_pos);
        m_read_pos = 0;
    }

    bool Rewind(std::optional<size_type> n = std::nullopt)
    {