c_cpp C ++巧用交换释放vector.cpp

Posted 2021-05-14

#include<iostream>
#include<vector>
using namespace std;
int main()
{
    vector<int> v;
    v.push_back(1);
    v.push_back(2);
    v.push_back(3);
    v.push_back(4);
    v.push_back(5);
 
    cout << "size:" << v.size() << endl;
    cout << "capacity:" << v.capacity() << endl;
 
    vector<int>().swap(v);//巧用swap释放vector
    
    cout << "after swap size:" << v.size() << endl;
    cout << "after swap capacity:" << v.capacity() << endl;
    return 0;
}

//输出：
// size:5
// capacity:6
// after swap size:0
// after swap capacity:0