SAP ABAP一组关键字 IS BOUND, IS NOT INITIAL和IS ASSIGNED的用法辨析
ABAP里的ISBOUND,ISNOTINITIAL和ISASSIGNED这组关键字,如果平时不留心,很容易理解地似是而非。今天我们就来说一说它们的区别。先把SAP帮助文档抄过来:ISBOUNDItcheckswhetherareferencevariablecontainsavalidreference.Adatareferencevariablethatcontainsastackrefere