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Questions tagged [copy-and-swap]

The copy swap idiom in C++ can be used to simplify the implementation of the assignment operator by used the copy constructor to generate a local copy and swapping it with the current object.

The copy swap idiom in C++ can be used to simplify the implementation of the assignment operator by used the copy constructor to generate a local copy and swapping it with the current object.

Use this tag for questions related to the copy and swap idiom.

For more detail, see also this Stackoverflow question.

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why should the parameter of assignment operator be passed by reference in C++?

i read the C++ primer 5th. i saw that it is ok when we use non-reference parameters in assignment operators that use copy and swap,but in the other assignment operators we always use reference parameters and copy the right-hand operand before…
Sherwin
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C++ : copy-and-swap idiom, alternative constructor

NB: This question follows a previous one, I hope it is okay to still ask it as a new question. I am trying to implement the "three and a half big rule" (copy-and-swap idiom) for a tree class, which looks like this: class Tree { friend void…
Seub
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swap method for a class inherited from enable_shared_from_this<...>

I have implemented a swap method for my class that inherits from enable_shared_from_this<...> class X : public enable_shared_from_this { int x; friend void swap(X& x1, X& x2) { using std::swap; swap(x1.x, x2.x); } …
traveh
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Interaction between copy-and-swap idiom and move operations

I'm trying to make a program that implements the interaction between "copy and swap" idiom and and move control operations so I wrote this code: class PInt { public: PInt(int = 0); PInt(const PInt&); PInt(PInt&&) noexcept; PInt&…
Maestro
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Swap elements with php between two html files

I have a problem I'm trying to solve with php, but I'm a total noob in terms of php programming The thing is, I'm modifying an html table with jquery, and what I want to do next is to swap this table with another exact table (exept for the classes…
mathetes
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swap and copy idiom can not be used in abstract class

I met a interesting error when I tried to use copy-and-swap idiom in an abstract class. The following code is specially created to demonstrate this situation, if there is anything improper, tell me but don't focus: template class…
Xiangyu Zhang
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