Method yyUnget

sql/sql_lex.h:1871–1876

Cancel the effect of the last yyGet() or yySkip(). Note that the echo mode should not change between calls to yyGet / yySkip and yyUnget. The caller is responsible for ensuring that. */

    and yyUnget. The caller is responsible for ensuring that.
  */
  void yyUnget()
  {
    m_ptr--;
    if (m_echo)
      m_cpp_ptr--;
  }

  /**
    Accept a character, by advancing the input stream.