C++ vector容器删除操作

Posted 2020-06-13

1.vector::pop_back()

删除vector的最后一个元素，vector的大小减一，删了的元素被销毁。

 

2.vector::erase()

iterator erase (iterator position);
iterator erase (iterator first, iterator last);//这个删除的范围是左闭右开

//C++11要求形参是const迭代器
iterator erase (const_iterator position);
iterator erase (const_iterator first, const_iterator last);//这个删除的范围是左闭右开

// example
// erasing from vector
#include <iostream>
#include <vector>

int main ()
{
  std::vector<int> myvector;

  // set some values (from 1 to 10)
  for (int i=1; i<=10; i++) myvector.push_back(i);

  // erase the 6th element
  myvector.erase (myvector.begin()+5);

  // erase the first 3 elements:
  myvector.erase (myvector.begin(),myvector.begin()+3);

  std::cout << "myvector contains:";
  for (unsigned i=0; i<myvector.size(); ++i)
    std::cout << ‘ ‘ << myvector[i];
  std::cout << ‘\n‘;

  return 0;
}