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Re: C++11 [message #38183 is a reply to message #38182]

Tue, 04 December 2012 08:08

mirek
Messages: 14267
Registered: November 2005

Ultimate Member

Lance wrote on Mon, 03 December 2012 18:55

Thanks Mirek. I got it.

So U++'s Vector would still outperform std::vector significantly for classes have move constructor and move assignment defined?

Well, it depends on many factors, but generally yes.

The difference is that when expanding std::vector, the code still has to iterate through all elements and move them (albeit using &&). Vector simply performs memcpy on raw data.

Now it is possible that the std::vector iteration could in the end be optimized by compiler to something like memcpy, as long as compiler sees the inlined move contructor, in that case the performace should be similar. But in the end, Vector always does memcpy Smile

Mirek

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[Message index]

		C++11 By: Mindtraveller on Wed, 12 October 2011 11:20
		Re: C++11 By: mirek on Fri, 14 October 2011 12:18
		Re: C++11 By: lectus on Sat, 03 December 2011 12:03
		Re: C++11 By: nlneilson on Sun, 02 December 2012 08:35
		Re: C++11 By: Lance on Sun, 02 December 2012 15:08
		Re: C++11 By: dolik.rce on Sun, 02 December 2012 16:04
		Re: C++11 By: Lance on Sun, 02 December 2012 18:05
		Re: C++11 By: Lance on Sun, 02 December 2012 18:47
		Re: C++11 By: Lance on Sun, 02 December 2012 19:30
		Re: C++11 By: dolik.rce on Sun, 02 December 2012 20:12
		Re: C++11 By: Lance on Sun, 02 December 2012 21:00
		Re: C++11 By: mirek on Mon, 03 December 2012 11:04
		Re: C++11 By: mirek on Mon, 03 December 2012 11:10
		Re: C++11 By: Lance on Tue, 04 December 2012 00:55
		Re: C++11 By: mirek on Tue, 04 December 2012 08:08
		Re: C++11 By: Lance on Tue, 19 March 2013 03:24
		Re: C++11 By: dolik.rce on Sun, 24 June 2012 09:51
		Re: C++11 By: mirek on Sun, 24 June 2012 12:50
		Re: C++11 By: unodgs on Sun, 24 June 2012 13:02
		Re: C++11 By: mirek on Sun, 24 June 2012 13:13
		Re: C++11 By: unodgs on Sun, 24 June 2012 13:21
		Re: C++11 By: dolik.rce on Sun, 24 June 2012 16:24
		Re: C++11 By: lectus on Wed, 27 June 2012 01:29
		Re: C++11 By: mirek on Thu, 28 June 2012 08:16
		Re: C++11 By: Lance on Sun, 02 December 2012 06:18

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