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#pragma once

Tarviathun · 2005-01-19T18:27:48

In my computer science class(C++), my professor made a big deal about making sure that headers weren't included more than once. He made everyone define a constant for their headers. The code looked like this: #ifndef _FOO_H #define _FOO_H //header code here #endif //_FOO_H Is there any functional/practical difference between this and #pragma once? Or am I being a complete idiot and asking about things of which I know nothing? :)

General and Gameplay Programming Programming

Started by Tarviathun January 18, 2005 04:43 AM

12 comments, last by Jan Wassenberg 19 years, 3 months ago

Promit

13,404

January 18, 2005 04:50 PM

Unknown pragmas are supposed to be ignored by the compiler -- they should never generate an error. So it's not terribly necessary to check that your compiler supports them, but try not to rely on them.

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Jan Wassenberg

1,000

January 18, 2005 05:18 PM

Tarviathun: sure, no one means ill. If you looked, all is well :)

Zipster: IIRC C99 says undefined macros in #if evaluate to 0, but ICC warns you about it. It's a little bit safer to write #if defined(x) && x > 1200.

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Zipster

2,420

January 18, 2005 06:02 PM

Of all the things to worry about, I'd put that at the bottom of the list [smile]
But fine, you win you sexy man you. Finally I get to use "Replace in Files".

Jan Wassenberg

1,000

January 19, 2005 06:27 PM

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#pragma once

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