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）
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
40.6 推广数值算法
在<numeric>中，标准库提供了一些推广的数值算法，其风格类似<algorithm>中的非数值算法（见第32章）。这些算法提供了通用版本，对数值序列进行常见运算：
这些算法推广了求和这样的常见运算，将它们应用于各种序列并将施用于序列元素的运算作为参数。对每个算法，标准库都在通用版本之外提供了应用最常用运算符的版本。
40.6.1 accumulate（）
accumulate（）的简单版本累加序列中的元素，使用的是+运算符：
我们可以像下面这样使用accumulate（）：
传递来的初值的类型决定了返回类型。
我们可以传递给accumulate（）一个初始值和一个“组合元素”的操作，因此accumulate（）并非总是进行加法运算。
从一个数据结构中抽取值的操作是accumulate（）的最常见的操作。例如：
在某些社区中，类似accumulate的操作被称为reduce、reduction和fold。
40.6.2 inner_product（）
累加一个序列非常常见，而累加一对序列也并不罕见： ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.