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This article introduces the relevant knowledge of "how to correctly use the swap function in C++". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

The way the swap function is widely used is to assume that it will never fail, and it is difficult to write a program that works even if something goes wrong with swap. Standard library containers and algorithms do not work properly when element exchange fails.

Example, bad (negative example) void swap (My_vector& x, My_vector& y)

{

Auto tmp = x; / / copy elements

X = y

Y = tmp

}

The problem with this code is not only slow, but if a memory request occurs because of an element of tmp, if used, the swap may throw an exception and cause the STL algorithm to fail.

Enforcement (implementation recommendations)

(simple) if the class contains swap member functions, it should be declared as noexcept.

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