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 A Library for Handling
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Description: 
 This function
returns a boolean result (0 or 1) to indicate whether a value has been explicitly
set for one of an 
Object’ s attributes.  
Synopsis 
 int astTest( AstObject
this, const
char attrib
)  
 Parameters: 
  this  
 Pointer to the Object.  
  attrib  
 Pointer to a
null-terminated character string containing the name of the attribute to be
tested.  
    Applicability 
  Object  
 This function applies to all Objects.  
   
Returned Value 
  astTest()  
 One if a value has previously been explicitly
set for the attribute (and hasn’ t been cleared), otherwise zero.  
    Notes: 
- 
                                                                                       
                                                                                       
Attribute names are not case sensitive and may be surrounded by white space.
 
- 
A value of zero will be returned if this function is invoked with the AST error status
set, or if it should fail for any reason.
 
- 
A value of zero will also be returned if this function is used to test a read-only
attribute, although no error will result.   
  Copyright (C) 2021 East Asian Observatory
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 A Library for Handling
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Coordinate Systems
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