从std :: vector >中删除元素

My compiler complains.

我的编译器抱怨。

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

int main(){

        vector<string> vec[2];
        vec[0].push_back("test1");
        vec[0].push_back("test2");

        cout << vec[0][0] << endl;
        vec[0].erase(vec.begin());
        cout << vec[0][1] << endl;

}

What is wrong when I call erase?

我打电话给擦除有什么问题?

2 个解决方案

#1

vec is an array of vector<string>s. I believe you meant vec[0].begin() like so:

vec是vector 的数组。我相信你的意思是vec [0] .begin()就像这样:

vec[0].erase(vec[0].begin());

#2

    vec[0].erase(vec[0].begin());
    cout << vec[0][1] << endl;

After you erased the first element, there's only one left. This one element is at position 0, which means index 1 is off bounds -> undefined behaviour.

擦除第一个元素后,只剩下一个元素。这一个元素位于0位置,这意味着索引1是非界限 - >未定义的行为。

#1