IEC 扩展操作符

本章包含了哪些内容？

• IEC 扩展操作符

• __DELETE

• __ISVALIDREF

• __NEW

• __QUERYINTERFACE

• __QUERYPOINTER

• AND_THEN

• OR_ELSE

• __TRY, __CATCH, __FINALLY, __ENDTRY

• __VARINFO

• ‘__POSITION’

• ‘__POUNAME’

• __POOL

• 范围操作符