Has the Mapping been simplified?


This attribute indicates whether a Mapping has been simplified by the AST_SIMPLIFY method. If the IsSimple value is non-zero, then the Mapping has been simplified and so there is nothing to be gained by simplifying it again. Indeed, the AST_SIMPLIFY method will immediately return the Mapping unchanged if the IsSimple attribute indicates that the Mapping has already been simplified.
Integer (boolean), read-only.


All Mappings have this attribute.
All classes of Frame return zero for the IsSimple attribute. This is because changes can be made to a Frame which affect the Mapping represented by the Frame, and so there can be no guarantee that the Mapping may not need re-simplifying. Most non-Frame Mappings, on the other hand, are immutable and so when they are simplified it is certain that they weill remain in a simple state.