Function SCIPcacheRowExtensions 

pub unsafe extern "C" fn SCIPcacheRowExtensions(
    scip: *mut SCIP,
    row: *mut SCIP_ROW,
) -> SCIP_RETCODE

informs row, that all subsequent additions of variables to the row should be cached and not directly applied; after all additions were applied, SCIPflushRowExtensions() must be called; while the caching of row extensions is activated, information methods of the row give invalid results; caching should be used, if a row is build with SCIPaddVarToRow() calls variable by variable to increase the performance

@return \ref SCIP_OKAY is returned if everything worked. Otherwise a suitable error code is passed. See \ref SCIP_Retcode “SCIP_RETCODE” for a complete list of error codes.

@pre this method can be called in one of the following stages of the SCIP solving process: - \ref SCIP_STAGE_INITSOLVE - \ref SCIP_STAGE_SOLVING