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AST_BEGIN - Begin a new AST context   

Description:
This routine begins a new AST context. Any Object pointers created within this context will be annulled when it is later ended using AST_END (just as if AST_ANNUL had been invoked), unless they have first been exported using AST_EXPORT or rendered exempt using AST_EXEMPT. 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.

Invocation:
CALL AST_BEGIN( STATUS )

Arguments:
STATUS = INTEGER (Given and Returned)
The global status.

Class Applicability:
Object
This routine applies to all Objects.

Notes:
  • This routine attempts to execute even if STATUS is set to an error value.
  • Contexts delimited by AST_BEGIN and AST_END may be nested to any depth.



next up previous
Next: AST_BORDER - Draw a border around valid regions of a Plot
Up: AST Routine Descriptions
Previous: AST_AXOFFSET - Add an increment onto a supplied axis value

AST A Library for Handling World Coordinate Systems in Astronomy
Starlink User Note 210
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