双向队列clear函数运用

clear
语法:

1	void clear();

clear()函数删除双向队列中所有元素。

源代码

template <typename _Tp, typename _Alloc>

void

deque<_Tp,_Alloc>::

clear()

{

for (_Map_pointer __node = this->_M_impl._M_start._M_node + 1;

__node < this->_M_impl._M_finish._M_node;

++__node)

{

std::_Destroy(*__node, *__node + _S_buffer_size());

_M_deallocate_node(*__node);

}

if (this->_M_impl._M_start._M_node != this->_M_impl._M_finish._M_node)

{

std::_Destroy(this->_M_impl._M_start._M_cur, this->_M_impl._M_start._M_last);

std::_Destroy(this->_M_impl._M_finish._M_first, this->_M_impl._M_finish._M_cur);

_M_deallocate_node(this->_M_impl._M_finish._M_first);

}

else

std::_Destroy(this->_M_impl._M_start._M_cur, this->_M_impl._M_finish._M_cur);

this->_M_impl._M_finish = this->_M_impl._M_start;

}

测试代码：

测试结果：

5
0
请按任意键继续. . .