std::array::cbegin

const_iterator cbegin() const noexcept;

Returns a const_iterator pointing to the first element in the array container.

返回一个指向array容器第一个元素的const_iterator.

A const_iterator is an iterator that points to const content. This iterator can be increased and decreased (unless it is itself also const), just like the iterator returned by array::begin,
but it cannot be used to modify the contents it points to, even if the array object is not itself const.

一个const_iterator是一个类似指向常量的iterator,这个迭代器可以递增以及递减（除非该迭代器自己也是cosnt的），返回值和begin获得的差不多，但是不能用于修改其内容，即使该array不是const的。

Parameters

none

Return Value

A const_iterator to the beginning of the sequence.
返回值为一个指向序列开头的const_iterator。
Member type const_iterator is a random access iterator type that points to a const element.
迭代器的类型属于随机访问迭代器。

Example

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// array::cbegin example
#include <iostream>
#include <array>

int main ()
{
  std::array<int,5> myarray = { 2, 16, 77, 34, 50 };

  std::cout << "myarray contains:";

  for ( auto it = myarray.cbegin(); it != myarray.cend(); ++it )
    std::cout << ' ' << *it;   // cannot modify *it

  std::cout << '\n';

  return 0;
}

Output:

myarray contains: 2 16 77 34 50

Complexity

Constant.

Iterator validity

No changes.

Data races

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.

容器的元素不会被访问，但是返回的迭代器可以被用来访问元素，同时访问以及修改其他元素是安全的。

Exception safety

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

该成员方法不会抛出异常。

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

通过复制构造器以及赋值构造获得的该iterator也保证不会抛出异常。

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转载请注明出处：http://blog.csdn.net/qq844352155
author:天下无双

Email:coderguang@gmail.com

2014-8-26

于GDUT

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