Answer by Kerrek SB for What is the copy-and-swap idiom?
I would like to add a word of warning when you are dealing with C++11-style allocator-aware containers. Swapping and assignment have subtly different semantics. For concreteness, let us consider a...
View ArticleAnswer by Tony Delroy for What is the copy-and-swap idiom?
There are some good answers already. I'll focus mainly on what I think they lack - an explanation of the "cons" with the copy-and-swap idiom.... What is the copy-and-swap idiom? A way of implementing...
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Answer by Oleksiy for What is the copy-and-swap idiom?
This answer is more like an addition and a slight modification to the answers above. In some versions of Visual Studio (and possibly other compilers) there is a bug that is really annoying and doesn't...
View ArticleAnswer by sbi for What is the copy-and-swap idiom?
Assignment, at its heart, is two steps: tearing down the object's old state and building its new state as a copy of some other object's state. Basically, that's what the destructor and the copy...
View ArticleAnswer by GManNickG for What is the copy-and-swap idiom?
Overview Why do we need the copy-and-swap idiom? Any class that manages a resource (a wrapper, like a smart pointer) needs to implement The Big Three. While the goals and implementation of the...
View ArticleWhat is the copy-and-swap idiom?
What is this idiom and when should it be used? Which problems does it solve? Does the idiom change when C++11 is used? Although it's been mentioned in many places, we didn't have any singular "what is...
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