Re: [boost] [xint] Third release is ready, requesting preliminary review

Subject: Re: [boost] [xint] Third release is ready, requesting preliminary review
From: Chad Nelson (chad.thecomfychair_at_[hidden])
Date: 2010-05-03 14:11:37

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On 05/03/2010 01:45 PM, Jeffrey Lee Hellrung, Jr. wrote:

>>> And I wonder about "return BOOST_XINT_MOVE(p);" instead of
>>> "return p;" and let the compiler optimise the return via NRVO...
>> 
>> Does NRVO work with emulated move semantics? I was under the
>> impression that it couldn't, but I could well be wrong, Boost.Move
>> is new to me.
> 
> RVO works independently of (emulated) move semantics. [...] One of
> the main things (emulated) move semantics gives you is the ability to
> overload functions on lvalue or (emulated) rvalue reference, giving
> you the opportunity to capture temporaries and pilfer/reuse their 
> resources.

If that's the case, and GCC is doing that as it should, why would adding
move semantics to the library provide any speed increase at all?
- -- 
Chad Nelson
Oak Circle Software, Inc.
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