public member function
<list>

std::list::clear

void clear();
void clear() noexcept;
Clear content
Removes all elements from the list container (which are destroyed), and leaving the container with a size of0.

参数



返回值



示例

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
// clearing lists
#include <iostream>
#include <list>

int main ()
{
  std::list<int> mylist;
  std::list<int>::iterator it;

  mylist.push_back (100);
  mylist.push_back (200);
  mylist.push_back (300);

  std::cout << "mylist contains:";
  for (it=mylist.begin(); it!=mylist.end(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';

  mylist.clear();
  mylist.push_back (1101);
  mylist.push_back (2202);

  std::cout << "mylist contains:";
  for (it=mylist.begin(); it!=mylist.end(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';

  return 0;
}

输出
mylist contains: 100 200 300
mylist contains: 1101 2202


复杂度

Linear in list::size (destructions).

迭代器有效性

All iterators, references and pointers related to this container are invalidated, except the end iterators.

数据竞争

The container is modified.
所有包含的元素都被修改。

异常安全

无异常保证:此成员函数从不抛出异常。

另见