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- Description:
This macro invokes a function to begin a new AST context.
Any Object pointers
created within this context will be annulled when it is later
ended using astEnd (just as if astAnnul had been invoked),
unless they have first been exported using astExport or rendered
exempt using astExempt. If
annulling a pointer causes an Object's RefCount 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.
Next: astBorder - Draw a border around valid regions of a Plot
Up: AST Function Descriptions
Previous: astAxOffset - Add an increment onto a supplied axis value
AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 211
R.F. Warren-Smith & D.S. Berry
30th April 2003
E-mail:ussc@star.rl.ac.uk
Copyright (C) 2003 Central Laboratory of the Research Councils