comp.lang.idl-pvwave archive: archive » Re: A simple DLM question

Home » Public Forums » archive » Re: A simple DLM question

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: A simple DLM question [message #81245 is a reply to message #81244]

Mon, 27 August 2012 15:04

Xin Tao
Messages: 40
Registered: April 2011

Member

Thanks Jimmy. That indeed solved my problem. It was so confusing to me, because I found from the External Development Guide that IDL_DELTMP should check it first. :)

On Monday, August 27, 2012 3:48:27 PM UTC-5, jimmylee...@gmail.com wrote:
> On Monday, August 27, 2012 11:13:57 AM UTC-6, Xin Tao wrote:
>
>> Hi,
>
>>
>
>>
>
>>
>
>> I'm having trouble figuring out the problem of the following DLM code:
>
>>
>
>>
>
>>
>
>> /* The c routine */
>
>>
>
>>
>
>>
>
>> void simple(int argc, IDL_VPTR argv[])
>
>>
>
>> {
>
>>
>
>> IDL_VPTR v;
>
>>
>
>>
>
>>
>
>> v = IDL_BasicTypeConversion(1, &argv[0], IDL_TYP_DOUBLE);
>
>>
>
>>
>
>>
>
>> IDL_DELTMP(v);
>
>>
>
>> }
>
>>
>
>>
>
>>
>
>> This routine just takes its input and convert it to double. After converting it to a DLM, however, I seem to see strange results.
>
>>
>
>>
>
>>
>
>> IDL> simple, 1.0d
>
>>
>
>> % Loaded DLM: TESTMODULE.
>
>>
>
>> IDL> simple, -1.0d
>
>>
>
>> Bus error
>
>>
>
>>
>
>>
>
>> That is: if I give it 1.0d as input, then the code is fine. However, if I use -1.0d, then there is a BUS error, presumably from IDL_DELTMP(v). I really don't understand why this is the case. Isn't IDL_DELTMP supposed to decide first whether v is a temporary variable or not? If I remove IDL_DELTMP, of course, I'll frequently get the annoying warning message "% Temporary variables are still checked out - cleaning up...".
>
>>
>
>>
>
>>
>
>> Please give me some help. Thanks.
>
>
>
> Try this:
>
>
>
> if (v != argv[0]) IDL_DELTMP(v);
>
>
>
> That is, no conversion was necessary.
>
>
>
> The macro (in idl_export.h, if you're interested) doesn't do extensive checking, and you should only free variables that are temps, not expressions or constants.

Report message to a moderator

[Message index]

		Re: A simple DLM question By: Michael Galloy on Wed, 29 August 2012 11:16
		Re: A simple DLM question By: chris_torrence@NOSPAM on Wed, 29 August 2012 10:50
		Re: A simple DLM question By: Lajos Foldy on Wed, 29 August 2012 10:31
		Re: A simple DLM question By: Xin Tao on Wed, 29 August 2012 09:23
		Re: A simple DLM question By: chris_torrence@NOSPAM on Wed, 29 August 2012 08:55
		Re: A simple DLM question By: Xin Tao on Tue, 28 August 2012 22:03
		Re: A simple DLM question By: Craig Markwardt on Tue, 28 August 2012 18:10
		Re: A simple DLM question By: Xin Tao on Tue, 28 August 2012 14:16
		Re: A simple DLM question By: Jim Pendleton on Tue, 28 August 2012 09:06
		Re: A simple DLM question By: Xin Tao on Mon, 27 August 2012 15:08
		Re: A simple DLM question By: Xin Tao on Mon, 27 August 2012 15:04
		Re: A simple DLM question By: Craig Markwardt on Mon, 27 August 2012 13:51
		Re: A simple DLM question By: Jim Pendleton on Mon, 27 August 2012 13:48

Previous Topic:	Tasselated Cap in IDL?
Next Topic:	Re: Succinct way of testing array membership

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 19:22:12 PDT 2025

Total time taken to generate the page: 1.27796 seconds