vector向量pop_back()函数运用实例

pop_back函数

语法:

1	void pop_back();

pop_back() 移除最后一个元素

源代码

/**

* @brief Removes last element.

* This is a typical stack operation. It shrinks the %vector by one.

* Note that no data is returned, and if the last element's

* data is needed, it should be retrieved before pop_back() is

* called.

void

pop_back()

{

--this->_M_impl._M_finish;

std::_Destroy(this->_M_impl._M_finish);

}

测试代码

// 梁笔记

// https://zouzhongliang.com

#include <iostream>

#include <vector>

using namespace std;

int main()

{

vector<int> v1;

vector<int> v2(10, 2);

v1.push_back(1);

v1.push_back(2);

v1.push_back(3);

v1.push_back(4);

v1.push_back(5);

for(int i=0;i<v1.size();++i){

cout<<v1[i]<<",";

}

cout<<endl;

v1.pop_back();

for(int i=0;i<v1.size();++i){

cout<<v1[i]<<",";

}

cout<<endl;

}

测试结果：

1 2	1,2,3,4,5, 1,2,3,4,