public member function
<deque>

std::deque::clear

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

参数



返回值



示例

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// clearing deques
#include <iostream>
#include <deque>

int main ()
{
  unsigned int i;
  std::deque<int> mydeque;
  mydeque.push_back (100);
  mydeque.push_back (200);
  mydeque.push_back (300);

  std::cout << "mydeque contains:";
  for (std::deque<int>::iterator it = mydeque.begin(); it!=mydeque.end(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';

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

  std::cout << "mydeque contains:";
  for (std::deque<int>::iterator it = mydeque.begin(); it!=mydeque.end(); ++it)
    std::cout << ' ' << *it;
  std::cout << '\n';

  return 0;
}

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


复杂度

Linear in size (destructions).

迭代器有效性

所有与该容器相关的迭代器、指针和引用都将失效。

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