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Dark GDK / #ifndef

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tomtetlaw
15
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Joined: 18th Jan 2009
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Posted: 12th Mar 2009 07:53
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What is this for and what does it do?:

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prasoc
16
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Posted: 12th Mar 2009 09:38
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I don't really know, but i would guess that #ifndef ... endif is "if not defined do this.... end if"
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Michael P
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Joined: 6th Mar 2006
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Posted: 12th Mar 2009 09:45
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Prasoc is correct.

What you have there is a header guard which ensures that if the header file is included twice, the functions are only defined once because on the second time _my_header_h_ will be defined. This situation can occur in multi file projects. You can also use #pragma once which is designed to do the same thing, but can vary between compilers.
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