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std::unique_ptr::swap

性病：：独特[医]PTR：：交换

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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