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Re: How to get _overloadSize to return N_Dimensions=0? [message #94360 is a reply to message #94355]

Wed, 19 April 2017 14:19

Michael Galloy
Messages: 1114
Registered: April 2006

Senior Member

On 4/18/17 7:56 AM, Matthew Argall wrote:
> The problem with undefined variables was fixed, but there is another
> bug related to scalar values. I assume N_Elements is determined as
> Product(Size(input, /DIMENSIONS)). However, a scalar value has a
> dimension size of 0, so the result of 0 elements.
>
>
> function test_olSize::_OverloadSize
> return, size(*self.value, /DIMENSIONS)
> end
>
> function test_olSize::Init, value
> compile_opt strictarr
> self.value = Ptr_New(value, /NO_COPY)
> return, 1
> end
>
> pro test_olSize__define
> class = {test_olSize, $
> inherits IDL_Object, $
> value: ptr_new()}
> end
>
>
> IDL> myObj = Obj_New('Test_olSize', 1)
> IDL> Print, N_Elements(myObj)
> 0
>

I would use something like the following for your _overloadSize method:

function test_olsize::_overloadSize
return, size(*self.value, /n_dimensions) eq 0 $
? 1L $
: size(*self.value, /dimensions)
end

IDL> myObj = Obj_New('Test_olSize', 1)
IDL> Print, N_Elements(myObj)
1

Mike

--
Michael Galloy
www.michaelgalloy.com
Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)

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[Message index]

		How to get _overloadSize to return N_Dimensions=0? By: Matthew Argall on Tue, 27 May 2014 15:40
		Re: How to get _overloadSize to return N_Dimensions=0? By: chris_torrence@NOSPAM on Tue, 27 May 2014 20:14
		Re: How to get _overloadSize to return N_Dimensions=0? By: Matthew Argall on Tue, 18 April 2017 06:56
		Re: How to get _overloadSize to return N_Dimensions=0? By: Michael Galloy on Wed, 19 April 2017 14:19
		Re: How to get _overloadSize to return N_Dimensions=0? By: Matthew Argall on Fri, 21 April 2017 09:48

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