std::unique_ptr::swap
void swap(unique_ptr& other); | ? | (since C++11) |
|---|
交换托管对象和相关删除器。*this另一个unique_ptr对象other...
参数
other | - | another unique_ptr object to swap the managed object and the deleter with |
|---|
返回值
%280%29
例外
noexcept规格：
noexcept
例
二次
#include <iostream>
#include <memory>
struct Foo {
Foo(int _val) : val(_val) { std::cout << "Foo...\n"; }
~Foo() { std::cout << "~Foo...\n"; }
int val;
};
int main()
{
std::unique_ptr<Foo> up1(new Foo(1));
std::unique_ptr<Foo> up2(new Foo(2));
up1.swap(up2);
std::cout << "up1->val:" << up1->val << std::endl;
std::cout << "up2->val:" << up2->val << std::endl;
}二次
产出：
二次
Foo...
Foo...
up1->val:2
up2->val:1
~Foo...
~Foo...二次
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