vector向量rend()函数运用实例

rend函数

语法:

1 2	reverse_iterator rend(); const_reverse_iterator rend() const;

rend() 返回Vector起始的逆迭代器

源代码

/**

* Returns a read/write reverse iterator that points to one

* before the first element in the %vector. Iteration is done

* in reverse element order.

reverse_iterator

rend() { return reverse_iterator(begin()); }

/**

* Returns a read-only (constant) reverse iterator that points

* to one before the first element in the %vector. Iteration

* is done in reverse element order.

const_reverse_iterator

rend() const { return const_reverse_iterator(begin()); }

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(3, 2);

v1.push_back(1);

v1.push_back(2);

v1.push_back(3);

v1.push_back(4);

v1.push_back(5);

//顺序输出

vector<int>::iterator it = v1.begin();

for(it;it!=v1.end();it++)

cout<<*it<<",";

cout<<endl;

//倒序输出

vector<int>::reverse_iterator it1 = v1.rbegin();

for(it1;it1!=v1.rend();it1++)

cout<<*it1<<",";

cout<<endl;

}

测试结果：

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