Function good

pdal/util/Extractor.hpp:101–102

Determine whether the extractor is good (the get pointer is in the buffer). \return Whether the get pointer is valid. */

      \return  Whether the get pointer is valid.
    */
    bool good() const
        { return m_gptr < m_egptr; }

    /**
      Extract a string of a particular size from the buffer.  Trim trailing