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Re: taming the shrew, a.k.a. structure [message #26016 is a reply to message #26001]

Wed, 01 August 2001 08:55

Todd Clements
Messages: 23
Registered: January 2001

Junior Member

david@dfanning.com (David Fanning) wrote:
>> temp = myStruct.array1
>> myStruct.array1 = ptr_new( (*myStruct.array1)[0:1024] )
>> ptr_free, temp
>
> This really becomes nothing more than this:
>
> *myStruct.array1 = (*myStruct.array1)[0:1024]
>
> There is no need to free the old pointer, make
> a new one etc. Pointers are like IDL variables
> in this respect. They *always* point to the
> current thing you have pointed them too.

That's a useful thing to know. I didn't realize that IDL would do that
for you. I guess coming from the world of C, my default reaction is to
think that pointers are static and you have to make sure to explicitly
resize them appropriately if that's what you want to do. I guess that
works with all variables in C, but I'd gotten used to regular variables
not being static.

Well, guess I can shut my brain off for the day since I've already
learned something new. =)

Todd

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[Message index]

		Re: taming the shrew, a.k.a. structure By: HILBERMAN on Thu, 02 August 2001 10:30
		Re: taming the shrew, a.k.a. structure By: marc schellens[1] on Wed, 01 August 2001 07:35
		Re: taming the shrew, a.k.a. structure By: Todd Clements on Wed, 01 August 2001 08:55
		Re: taming the shrew, a.k.a. structure By: david[2] on Wed, 01 August 2001 10:48
		Re: taming the shrew, a.k.a. structure By: Pavel A. Romashkin on Wed, 01 August 2001 10:39
		Re: taming the shrew, a.k.a. structure By: HILBERMAN on Wed, 01 August 2001 10:02
		Re: taming the shrew, a.k.a. structure By: david[2] on Tue, 31 July 2001 16:26
		Re: taming the shrew, a.k.a. structure By: Todd Clements on Tue, 31 July 2001 15:35
		Re: taming the shrew, a.k.a. structure By: air_jlin on Fri, 03 August 2001 12:30

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