c++ - 如何按索引从std :: vector <>擦除元素？(How do I erase an element from std::vector<> by index?)

Question

I have a std::vector<int>, and I want to delete the n'th element.

(我有一个std :: vector <int>，我想删除第n个元素。)

How do I do that?

(我怎么做？)

std::vector<int> vec;

vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);

vec.erase(???);

  ask by dau_man translate from so

Answer 1

To delete a single element, you could do:

(要删除单个元素，您可以执行以下操作：)

std::vector<int> vec;

vec.push_back(6);
vec.push_back(-17);
vec.push_back(12);

// Deletes the second element (vec[1])
vec.erase(vec.begin() + 1);

Or, to delete more than one element at once:

(或者，一次删除多个元素：)

// Deletes the second through third elements (vec[1], vec[2])
vec.erase(vec.begin() + 1, vec.begin() + 3);