vector访问元素（删除性访问）

#include <cstdio>
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int main()
{
    vector<int> vec1;
    vector<int> vec2;
    vector<int> vec3;
    vec1.clear();
    vec2.clear();
    vec3.clear();
    int a[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    for(int i = 0; i < 10; i++)
    {
        vec1.push_back(a[i]);
        vec2.push_back(a[i]);
        vec3.push_back(a[i]);
    }
    ///用这种删除性访问时（如若不反转）vector相当于stack先进后出
    ///因为删除操作，只能从后面删除
    while(!vec1.empty())
    {
        cout << vec1.back() << " ";
        vec1.pop_back();
    }
    cout << '\n' << "-------------------" << '\n';
    reverse(vec2.begin(), vec2.end());
    while(!vec2.empty())
    {
        cout << vec2.back() << " ";
        vec2.pop_back();
    }
    cout << '\n' << "-------------------" << '\n';
///    while(!vec3.empty())
///    {
///        cout << vec3.front() << " ";
///        vec3.pop_front();此处编译不通过，vector没有pop_front成员
///   }
    return 0;
}