[gmpi] Re: Linux C++ question
- From: Paul Davis <paul@xxxxxxxxxxxxxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Wed, 23 Feb 2005 16:33:48 -0500
>A few more stylistic nits:
>
>[1] For in arguments, I like to use const references. Pointers are
>reserved for out. That gives a very handy way of knowing, at the call
>site, what might change and what might not. So:
>
>GMPI_Factory::CreateInstance( const GMPI_GUID& iid, ... )
>
>Note that a reference is the same as a pointer in C, or at least that's
>how they do it in COM. They declare the interface as const GUID*, but
>the impl can be const GUID&.
the best rule of thumb for this that i have seen is from meyers. the
rule is that if the object being passed as an argument can be null,
use a pointer, otherwise, use a reference. as far as in/out arguments,
i agree that if arguments are clearly "in", then const is
appropriate. its not always clear, however.
>Lastly, I still like to use NULL instead of 0 for pointers. I know in
>C++ you can use 0, but it's an old habit that helps reinforce that you
>are dealing with a pointer.
many C++ authorities advise against this because of the difficulty of
defining NULL acceptably.
--p
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