astBeginastBegin - Begin a new AST context

Description:
This macro invokes a function to begin a new AST context. Any ObjectObject pointers created within this context will be annulled when it is later ended using astEndastEnd (just as if astAnnulastAnnul had been invoked), unless they have first been exported using astExportastExport or rendered exempt using astExemptastExempt. If annulling a pointer causes an Object's RefCountRefCount attribute to fall to zero (which happens when the last pointer to it is annulled), then the Object will be deleted.
Synopsis:
void astBegin
Class Applicability:
Object
This macro applies to all Objects.
Notes:
  • astBegin attempts to execute even if the AST error status is set on entry.

  • Contexts delimited by astBegin and astEnd may be nested to any depth.