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Re: common block question [message #75723 is a reply to message #23576]

Wed, 13 April 2011 14:17

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

geoff writes:

> I am writing a program which will call a number of subroutines. I
> have a number of arrays, the largest of which (and will take a
> significant part of the memory) will be used in most (but not all) of
> the subroutines, will be created at the beginning and be retained
> until the end of the program.
>
> Is it easiest for me to define a common block in the main program with
> this main array and make this block available to the other sub
> routines when necessary? Is there any overhead in making the block
> available to all sub routines?
>
> I really just want to use a few global variables which are available
> to the whole list of programs

Sounds like a legitimate use of a common block
to me. Although passing the routine by reference
or passing a light-weight pointer would always
be my preference. It makes the code easier to
understand months later, for one thing. And it
allows me to run multiple instances of my program
(maybe not important here).

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thos speakest truth.")

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[Message index]

		COMMON block question By: Paul van Delst on Tue, 30 January 2001 07:53
		Re: common block question By: pgrigis on Thu, 14 April 2011 07:20
		Re: common block question By: oxfordenergyservices on Fri, 15 April 2011 03:02
		Re: common block question By: penteado on Wed, 13 April 2011 16:21
		Re: common block question By: David Fanning on Wed, 13 April 2011 14:17
		Re: common block question By: Paul Van Delst[1] on Fri, 15 April 2011 09:13
		Re: common block question By: penteado on Fri, 15 April 2011 08:33

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