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Re: Static Variables in IDL [message #5904 is a reply to message #5901]

Thu, 14 March 1996 00:00

steinhh
Messages: 260
Registered: June 1994

Senior Member

In article <4i8geg$5fv@vixen.cso.uiuc.edu>, santanu@eehpx22.cen.uiuc.edu (S Bhattacharyya) writes:
|>
|>
|> Pardon me if I appear a bit obtuse, but I am still a little confused. I am
|> under the impression that the common block declaration is equivalent to
|> C's global declaration. What I would like to have is a bit of non re-entrant
|> code in a standalone function (.pro). I want an IDL .pro that does the
|> following::
|>
|> main()
|> {
|> for(;;) non_rEntrant();
|> }
|> non_rEntrant()
|> {
|> static int block=1;
|>
|> if (block == 1){
|> puts("This is executed only once");
|> block=0;
|> }
|> puts("And this is done over and over again");
|> }

pro main
while 1 do non_rEntrant
end

pro non_rEntrant
common non_rEntrant_private_others_keep_off,block

if N_elements(block) eq 0 then block=1 ;; Instead of "static .... =1"

if block eq 1 then begin
print,"This is executed only once"
block = 0
end
print,"And this is done over and over again"
end

This will do what you want. Common blocks are not quite like
global declarations. I can have e.g., a variable called block
in the main program without having a conflict. I can even
have a variable called block at the interactive prompt level,
and still have no conflict.

|> call_procedure,'non_rEntrant'

You'll get speedier programs by using just

non_rEntrant

as in the example above 8-)

Stein Vidar

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[Message index]

		Re: Static Variables in IDL By: steinhh on Thu, 14 March 1996 00:00
		Re: Static Variables in IDL By: David Foster on Thu, 14 March 1996 00:00
		Re: Static Variables in IDL By: steinhh on Thu, 14 March 1996 00:00
		Re: Static Variables in IDL By: rivers on Wed, 13 March 1996 00:00

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