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Re: IDL interpreter questions - can someone (D.Fanning) explain - TIA [message #25134 is a reply to message #25075]

Tue, 22 May 2001 13:41

John-David T. Smith is currently offline

John-David T. Smith
Messages: 384
Registered: January 2000

Senior Member

mankoff@I.HATE.SPAM.lasp.colorado.edu wrote:
>
> On 18 May 2001, Craig Markwardt wrote:
>> <mankoff@I.HATE.SPAM.lasp.colorado.edu> writes:
>>> On Fri, 18 May 2001, JD Smith wrote:
>>>> dadada wrote:
>>>> > How are variables referenced by default?
>>>>
>>>> I'm not sure what you mean here. Pointer references? They are explicit
>>>> only... i.e. you can't create a reference of an existing variable.
>>>
>>> Not sure either, but here is my interpretation of the question/answer:
>>> In functions, variables are *always* 'by value'
>>> In procedures, they are 'by value' unless you put a "return" statement
>>> anywhere in the procedure. If this exists, then they are passed 'by
>>> reference'
>>
>> Sorry Ken I'm going to have to take you to task for a few things.
>> First of all, pass by value vs. pass by reference:
>>
>> * all variables are passed by reference, *except*
>> * subscripted arrays, structure tags, and (I believe) system variables,
>> which are passed by value
>>
>> It doesn't make a difference whether you have a return statement or
>> not.
>
> Hi JD,
>
> No need to apologize for a correction. But i have some questions about
> this that maybe you can answer.

I plead the 5th. Craig, I believe, was the taskmaster. I *never* take
anyone to task <sarcasmicon>.

JD

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[Message index]

		Re: IDL interpreter questions - can someone (D.Fanning) explain - TIA By: <mankoff[1] on Fri, 18 May 2001 17:17
		Re: IDL interpreter questions - can someone (D.Fanning) explain - TIA By: Craig Markwardt on Fri, 18 May 2001 12:31
		Re: IDL interpreter questions - can someone (D.Fanning) explain - TIA By: John-David T. Smith on Tue, 22 May 2001 13:41
		Re: IDL interpreter questions - can someone (D.Fanning) explain - TIA By: Craig Markwardt on Sat, 19 May 2001 10:20
		Re: IDL interpreter questions - can someone (D.Fanning) explain - TIA By: Mark Rivers on Fri, 18 May 2001 22:28

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