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Description: 
 This macro is intended to be used within the source or sink functions
associated with a 
Channel. It returns any pointer previously stored in the
Channel (that is, the Channel that has invoked the source or sink function) using
astPutChannelData.
This mechanism is a thread-safe alternative to passing file
descriptors, etc, via static global variables.  
Synopsis 
 void
astChannelData
 Applicability 
  Channel  
 This macro applies to all Channels.  
    Returned
Value 
  astChannelData  
 The pointer previously stored with the Channel using
astPutChannelData. A NULL pointer will be returned if no such pointer has been stored
with the Channel.  
    Notes: 
 Copyright (C) 2021 East Asian Observatory
  -  ←Prev 
- AST
 A Library for Handling
 World
Coordinate Systems
 in Astronomy
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