C++容器swap

除了array外，其余容器swap后，原指针扔指向原来元素，（元素本身没有被移动过）

arrray，则会真正交换两个array的元素,导致指针会指向新的元素

#include <QCoreApplication>
#include<array>
#include<vector>
#include<iostream>

int main(int argc, char *argv[])
{
    std::array<int,3> v1 ={1,2,3};
    std::array<int,3> v2 = {4,5,6};
    auto p1 = v1.begin()+1;
    auto p2 = v2.begin()+1;

    v1.swap(v2);

    std::cout<<*p1<<std::endl;// 5


    std::vector<int> v3 = {1,2,3};
    std::vector<int> v4 = {4,5,6};
    auto p3 = v3.begin()+1;
    auto p4 = v4.begin()+1;
    v3.swap(v4);

    std::cout<<*p3<<std::endl;




}


}