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I just took a brief look a the source code for some of the components in this project, which BTW I think is a great and the code looks really neat, and saw the use/need of includes to toys.h in many files.
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I was wondering why you don't have an include guard like...
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<p style="margin: 0px;">#ifndef _TOYS_H</p>
<p style="margin: 0px;">#include "toys.h"</p>
<p style="margin: 0px;">#define _TOYS_H</p>
<p style="margin: 0px;">#endif</p>
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<p style="margin: 0px;">...instead of the one-liner includes to make sure, in this case, toys.h is not been added several times over? Sorry if this is been taken care some place else and I didn't see it.</p>
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<p style="margin: 0px;">Thanks, Alex </p>
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