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Re: dereference with wildcard [message #69735]

Tue, 09 February 2010 09:05

Carsten Lechte
Messages: 124
Registered: August 2006

Senior Member

PimK wrote:
> print, mean( (*(*(*pState).navtrack)[*]).lat )
> % Expression must be a scalar in this context: <POINTER Array[2]>.

This is because you can only dereference scalar pointers. This is a fundamental
limitation of IDL's arrays: all array elements have to be of the same scalar
type. You can have arrays of pointers to anything, since the array is made up
of things of the same type (i.e. pointers). If you dereferenced the whole array,
you would have an array of "anything", which is not allowed. IDL refuses to
evaluate the expression, even if all the pointers pointed to a scalar integer,
and the resulting array would be legal in IDL.

chl

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		Re: dereference with wildcard By: Carsten Lechte on Tue, 09 February 2010 09:05
		Re: dereference with wildcard By: PimK on Wed, 10 February 2010 12:16

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