std::deque::crbegin

const_reverse_iterator crbegin() const noexcept;

Returns a const_reverse_iterator pointing to the last element in the container (i.e., its reverse beginning).

返回一个const_reverse_iterator指向容器的最后一个元素。

Parameters

none

Return Value

A const_reverse_iterator to the reverse beginning of the sequence.

返回一个反向的指向序列开头的迭代器

Member type const_reverse_iterator is a reverse random access iterator type that points to
a const element (see deque member types).

迭代器的类型属于随机访问迭代器。

Example

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// deque::crbegin/crend
#include <iostream>
#include <deque>

int main ()
{
  std::deque<int> mydeque = {1,2,3,4,5};

  std::cout << "mydeque backwards:";
  for (auto rit = mydeque.crbegin(); rit != mydeque.crend(); ++rit)
    std::cout << ' ' << *rit;
  std::cout << '\n';

  return 0;
}

运行截图：

Output:

mydeque backwards: 5 4 3 2 1

Complexity

Constant.

Iterator validity

No changes.

Data races

The container is accessed.

No contained elements are accessed by the call, but the iterator returned can be used to access them. Concurrently accessing or modifying different elements is safe.

容器的所有元素都不会被访问，但是返回的迭代器可以用来访问他们，同时访问以及修改不同的元素是安全的。

Exception safety

No-throw guarantee: this member function never throws exceptions.

The copy construction or assignment of the returned iterator is also guaranteed to never throw.

该成员方法不会抛出异常。

通过复制或者赋值获得的该迭代器的副本也不会抛出异常。