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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32.4 不修改序列的算法
不修改序列的算法只读取输入序列中元素的值，而不会重排序列或是改变元素值。用户提供给算法的操作一般也不会改变元素值，这些操作通常是谓词（不会修改实参）。
32.4.1 for_each（）
最简单的算法是for_each（），它简单地对序列中的每个元素执行指定操作：
只要可能，应该优选更专用的算法。
传递给for_each（）的操作可能会修改元素。例如：
32.4.2 序列谓词
例如：
当一个序列谓词失败时，它不会告知我们是哪个元素导致了失败。
32.4.3 count（）
例如：
谓词isspace（）（见36.2节）统计所有空白字符，而不仅仅是空格。
32.4.4 find（）
find（）系列算法顺序搜索具有特定值或令谓词为真的元素：
算法find（）和find_if（）都返回一个迭代器，分别指向匹配给定值和给定谓词的第一个元素。 ...
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