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Re: Should the pick semantics be changed? [message #42362 is a reply to message #42329]

Sun, 09 March 2014 09:34

mirek
Messages: 13980
Registered: November 2005

Ultimate Member

piotr5 wrote on Fri, 07 March 2014 10:23

I agree, imho this is a bug in gcc (or maybe also in c++11 standard): every return statement should pass the arguments as rvalue to the return-type constructor since the return statement is leaving scope and thereby its parameters have the same properties as all implicite rvalue objects: unlikely to remain (unless static), should not be altered except for purposes of picking, definitely a temporary value.

thinking about it, consider

struct Foo {
   Vector<int> bar;
 
   Vector<int> Bar() { return bar; }
};

Now perhaps compiler could distinguish the situation where local lvalue is returned, but I guess rules would become complicated here....

Mirek

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[Message index]

		Should the pick semantics be changed? By: piotr5 on Tue, 04 March 2014 11:00
		Re: Should the pick semantics be changed? By: mirek on Tue, 04 March 2014 12:12
		Re: Should the pick semantics be changed? By: piotr5 on Tue, 04 March 2014 23:14
		Re: Should the pick semantics be changed? By: mirek on Wed, 05 March 2014 08:54
		Re: Should the pick semantics be changed? By: piotr5 on Wed, 05 March 2014 10:27
		Re: Should the pick semantics be changed? By: mirek on Wed, 05 March 2014 12:02
		Re: Should the pick semantics be changed? By: mirek on Fri, 07 March 2014 09:00
		Re: Should the pick semantics be changed? By: piotr5 on Fri, 07 March 2014 16:23
		Re: Should the pick semantics be changed? By: mirek on Fri, 07 March 2014 16:44
		Re: Should the pick semantics be changed? By: mirek on Sun, 09 March 2014 09:34
		Re: Should the pick semantics be changed? By: piotr5 on Sun, 09 March 2014 13:28
		Re: Should the pick semantics be changed? By: Lance on Sun, 23 March 2014 22:02
		Re: Should the pick semantics be changed? By: piotr5 on Tue, 25 March 2014 19:35
		Re: Should the pick semantics be changed? By: Lance on Wed, 26 March 2014 02:37
		Re: Should the pick semantics be changed? By: Lance on Wed, 26 March 2014 02:48
		Re: Should the pick semantics be changed? By: piotr5 on Wed, 26 March 2014 10:35
		Re: Should the pick semantics be changed? By: mirek on Wed, 26 March 2014 11:38
		Re: Should the pick semantics be changed? By: Lance on Wed, 26 March 2014 21:25
		Re: Should the pick semantics be changed? By: Lance on Wed, 26 March 2014 21:21

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