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mlabs - 14 Oct 2007 01:48 GMT

the difference between..

#include

and

#import

?

TIA

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Gregory Weston - 14 Oct 2007 02:43 GMT

> the difference between..
>
[quoted text clipped - 7 lines]
>
> TIA

#import is a non-standard extension that inserts the contents of the
referenced file if and only if they haven't already been inserted into
the compilation unit. It is functionally similar to doing this:

#ifndef _MY_HEADER_INCLUDED_
#define _MY_HEADER_INCLUDED_
#include "MyHeader.h"
#endif

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Herb Petschauer - 14 Oct 2007 02:48 GMT

> the difference between..
>
[quoted text clipped - 7 lines]
>
> TIA

Google search "import include difference "objective C"".

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mlabs - 14 Oct 2007 03:43 GMT

thanks Gregory & Herb... makes sense . sort of like #pragma once ...
on windows...

A

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Gregory Weston - 14 Oct 2007 17:21 GMT

> thanks Gregory & Herb... makes sense . sort of like #pragma once ...
> on windows...

And at least a few Mac compilers I've used in the last 20 years. I
almost made a specific reference to #pragma once, but I wasn't sure how
widely that was implemented. So I went with the standard/portable
illustration only.

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Mac Forum / Programming / Mac Programming / October 2007

what is...