April 2018
Intermediate to advanced
303 pages
4h 54m
Chinese
Content preview from Effective Modern C++（中文版）
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转向现代
C++
｜
89
条款
14
：只要函数不会发射异常，就为其加上
noexcept
声明
在
C++98
中，异常规格可谓喜怒无常的野兽。你必须梳理出一个函数可能发射的所
有异常型别，所以，如果函数实现做了改动，那异常规格也难免要修订。而改动异常
规格可能会破坏客户代码，因为调用方可能依赖于原先的异常规格。编译器通常不会
在保持函数实现、异常规格和客户代码的一致性方面提供什么帮助。绝大多数程序员
最终认定，
C++98
中的异常规格还是不要招惹为妙。
而在
C++11
形成过程中，逐渐达成了一个共识，那就是关于函数发射异常这件事，真
正重要的信息是它到底会不会发射。非黑即白，一个函数或者可能发射异常，或它保
证自己不会。这种要么可能要么不可能的泾渭分明，形成了
C++11
异常规格的基础，
也实质上把
C++98
异常规格替换掉了（
C++98
风格的异常规格仍然成立，但已经它
们已经被标为废弃特性了）。在
C++11
中，无条件的
noexcept
就是为了不会发射异
常的函数而准备的。
函数是否要加上如此声明，事关接口设计。函数是否会发射异常这一行为，是客户方
面关注的核心。调用方可以查询函数的
noexcept
状态，而查询结果可能会影响调用代
码的异常安全性或运行效率。这么一来，函数是否带有
noexcept
声明，就和成员函数
是否带有
const
声明是同等重要的信息。当你明明知道一个函数不会发射异常却未给
它加上
noexcept
声明的话，这就是接口规格缺陷。
但是对不会发射异常的函数应用
noexcept
声明还有一个动机，那就是它可以让编译器 ...
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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.
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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.