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copied!<p>Usually, the class definition is typically in your .h file, and the implementation is in your .c(pp) file. </p> <p>One advantage of doing <code>#include "a.h"</code> in your b.c file, rather than in your b.h file, is that whenever a.h changes, not only b.c but also any other file that includes b.h will have be recompiled. </p> <p>Also, you're kind of unnecessary exposing implementation details of B to anyone using b.h. The idea is that b.h should not contain additional info that is of no interest to someone using class B (not because it's secret, but because people don't care and you don't want to bother them with it).</p> <p>There's no need to force anyone including b.h, to indirectly include a dozen of other .h files as well (because they're #included in b.h), just because you happen to use that stuff in b.c. Avoid clutter. </p> <p><strong>So if possible, it's best to <code>#include "a.h"</code> in b.c !</strong></p> <p>But this is not always possible. If you're just using A inside b.c, and there are no references to A in b.h, then it's OK. Also, if b.h only contains pointers to A (i.e. as members, function arguments or return values) but no 'type dependent' references, you could also put just this in b.h:</p> <pre><code>class A; </code></pre> <p>And still keep <code>#include "a.h"</code> in your b.c. But if there are more references or dependencies on a.h, that anyone including b.h really couldn't do without, then <code>#include "a.h"</code> should go in b.h</p>

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