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++
｜
95
void doWork()
noexcept
{
setup();
//
建立要做的工作
…
//
完成要做的工作
cleanup();
//
执行清理动作
}
这里
doWork
带有
noexcept
声明，尽管它调用了不带
noexcept
声明的函数
setup
和
cleanup
。这看起来自相矛盾，但也有可能是
setup
和
clean
已经在文档中写明它们
不会发射异常，尽管它们并没有加上这么一个声明。而不加这么一个声明，也可能有
充分的理由。例如，它们可能来自于使用
C
语言撰写的库（即使是那些来自
C
标准
库中被移入
std
名字空间的函数也都没有加上异常规格，例如，
std::strlen
就不带
noexcept
声明）。又或者它们可能来自一个
C++98
库，当时决定不采用
C++98
异常
规格，又还没来得及根据
C++11
标准做修订。
由于有着确实的理由使得带有
noexcept
声明的函数依赖于缺乏
noexcept
保证的代码，
C++
允许此类代码通过编译，并且编译器通常不会就此生成警告。
要点速记
•
noexcept
声明是函数接口的组成部分，这意味着调用方可能会对它有依赖。
•
相对于不带
noexcept
声明的函数，带有
noexcept
声明的函数有更多机会
得到优化。
•
noexcept
性质对于移动操作、
swap
、函数释放函数和析构函数最有价值。
•
大多数函数都是异常中立的，不具备
noexcept
性质。
条款
15
：只要有可能使用
constexpr
，就使用它
如果
C++ ...
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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.