STL C++ 中的最后迭代器是什么?

2022-01-07 00:00:00 c++ stl

谁能解释一下past-the-end 是什么意思.为什么我们调用 end() 函数越过结尾?

Any one could explain me what is the meaning of past-the-end. Why we call end() function past-the-end?

推荐答案

begin() 和 end() 函数定义了一个半开range([begin, end))，意思是:
该范围包括第一个元素但不包括最后一个元素.因此，名称在末尾.

The functions begin() and end() define a half open range([begin, end)), which means:
The range includes first element but excludes the last element. Hence, the name past the end.

半开放范围的优势是:

  1. 它避免了对空范围的特殊处理.对于空范围，begin() 等于end() .

它使迭代元素的循环的结束标准变得简单:循环简单只要没有到达 end() 就继续

It makes the end criterion simple for loops that iterate over the elements: The loops simply continue as long as end() is not reached

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