STL迭代器 - 目的 [英] STL iterators - purpose

问题描述

STL迭代器的用途是什么？程序员为什么要创建这个概念？

What is the purpose of STL iterators? Why have programmers created this concept at all?

推荐答案

迭代器允许您将算法与容器分开。只要你有一个开始和结束迭代器，并且知道迭代器的功能（随机访问等），你就可以在迭代器指定的范围内进行操作。例如，请参阅 std :: for_each ， std :: transform 。这样您就可以只实现一个算法版本，而不需要为每个希望它运行的容器编写一个新版本。

Iterators allow you to separate algorithms from the container. As long as you have a start and end iterator, and know the capabilities of the iterator (random access etc) you can do operations on the range specified by the iterators. For example, see std::for_each, std::transform. This way you can implement just one version of an algorithm rather than needing to write a new one for each container on which you wish it to operate.

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