std::pair::swap
void swap(pair& other); | | (since C++11) |
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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<first_type> && std::is_swappable_v<second_type> | (since C++17) |
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参数
other | - | pair of values to swap |
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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) |
swap | swaps the values of two objects (function template) |
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