August 2021
Intermediate to advanced
450 pages
6h 57m
Chinese
Content preview from C++程序设计语言（第4部分：标准库）（原书第4版）
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33.2 迭代器适配器
在<iterator>中，标准库提供了适配器，能从一个给定的迭代器类型生成有用的相关迭代器类型：
iostream的迭代器将在38.5节中介绍。
33.2.1 反向迭代器
使用一个迭代器我们可以从b到e遍历一个序列[b：e）。如果序列允许双向访问，我们还可以逆序，即从e到b遍历序列。实现逆序遍历的迭代器称为reverse_iterator。一个reverse_iterator从序列末尾（由其底层迭代器定义）向序列起始位置进行遍历。为了获得一个半开区间，我们必须将b-1视为序列的尾后位置，将e-1视为起始位置，从而得到半开区间[e-1：b-1）。因此，一个反向迭代器与其底层迭代器之间的根本关系是：&*（reverse_iterator（p））==&*（p-1）。特别是，如果v是一个vector，v.rbegin（）指向其尾元素v[v.size（）-1]。考虑下面的序列：
使用reverse_iterator，序列会如下所示：
reverse_iterator的定义可能像下面这样： ...
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