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std::pair::swap

STD：：对：交换

void swap(pair& other​(since C++11)

掉期first带着other.first和second带着other.second...

This function does not participate in overload resolution unless std::is_swappable_v && std::is_swappable_v(since C++17)

参数

other-pair of values to swap

返回值

%280%29

例外

例

二次

#include <iostream>
#include <utility>
#include <string>
int main()
{
    std::pair<int, std::string> p1, p2;
    p1 = std::make_pair(10, "test"
    p2.swap(p1
    std::cout << "(" << p2.first << ", " << p2.second << ")\n";
}

二次

产出：

二次

(10, test)

二次

另见

noexcept specification: noexcept( noexcept(std::swap(first, other.first)) && noexcept(std::swap(second, other.second)). )(until C++17)
noexcept specification: noexcept( std::is_nothrow_swappable<first_type>::value) && std::is_nothrow_swappable<second_type>::value). )(since C++17)

swapswaps the values of two objects (function template)

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