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Re: How would you design a good copy/move semantics system? [message #44149 is a reply to message #44049]

Thu, 08 January 2015 11:23

mirek is currently offline

mirek
Messages: 13975
Registered: November 2005

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cbpporter wrote on Thu, 18 December 2014 12:55

What I'm mostly interested in is what are the rules for guaranteeing a maximum invocation of move constructors in implicit situations, like when assigning or returning values.

U++ chose to have default copy to be move for this reason, right?

Originally, yes. But please note that the whole thing changed last year.

Now you have to be explicit, either 'pick' or 'clone' the source, with some exceptions (e.g. returning temporary). (Enforced in C++11, in C++0x it is backward compatible).

IMO, C++11 way, where move constructor is called "sometimes" based on context leads to using deep copy in unexpected situations.

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[Message index]

		How would you design a good copy/move semantics system? By: cbpporter on Mon, 15 December 2014 15:08
		Re: How would you design a good copy/move semantics system? By: cbpporter on Thu, 18 December 2014 12:55
		Re: How would you design a good copy/move semantics system? By: Lance on Sat, 20 December 2014 00:13
		Re: How would you design a good copy/move semantics system? By: cbpporter on Wed, 07 January 2015 11:31
		Re: How would you design a good copy/move semantics system? By: Lance on Thu, 08 January 2015 01:16
		Re: How would you design a good copy/move semantics system? By: mirek on Thu, 08 January 2015 11:23
		Re: How would you design a good copy/move semantics system? By: cbpporter on Mon, 12 January 2015 11:21
		Re: How would you design a good copy/move semantics system? By: mirek on Mon, 12 January 2015 19:06

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