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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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- AST
A Library for Handling
World
Coordinate Systems
in Astronomy - Next→
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