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From: Michael Marcin (mike.marcin_at_[hidden])
Date: 2008-07-07 11:43:54

Philippe Vaucher wrote:
>> In general noone would write a function that took an int by const reference
>> because doing so doesn't make sense from a performance standpoint. However
>> often times we pass these trivial types to functions generically written to
>> take const T&.
> While I agree with it from a convenience-oriented point of view, I don't
> think using a reference is any slower than passing the POD by value.
> My point is that it'd not make a difference if sizeof(const T&) ==
> sizeof(T).
> Does anyone knows of have some kind of benchmark showing passing an int by
> const ref is actually slower than by value?

As I mentioned in a previous post in this thread it really does have a
measurable impact in some cases.

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