C++ reference: advance

参考自：http://www.cplusplus.com/reference/iterator/advance/

advance

---

template <class InputIterator, class Distance>
  void advance (InputIterator& it, Distance n);

将迭代器向前推进n个元素位置。

• 示例 

#include <iostream>     // std::cout
#include <iterator>     // std::advance
#include <list>         // std::list

int main () {
  std::list<int> mylist;
  for (int i=0; i<10; i++) mylist.push_back (i*10);

  std::list<int>::iterator it = mylist.begin();

  std::advance (it,5);

  std::cout << "The sixth element in mylist is: " << *it << '\n';

  return 0;
}/*Output
The sixth element in mylist is: 50
*/