yy_delete_buffer
void yy_delete_buffer (YY_BUFFER_STATE b );
yy_delete_buffer(YY_CURRENT_BUFFER);
yy_delete_buffer(YY_CURRENT_BUFFER );
yy_delete_buffer(YY_CURRENT_BUFFER );
void yy_delete_buffer( struct yy_buffer_state* b );
virtual void yy_delete_buffer( struct yy_buffer_state* b ) = 0;