April 2018
Intermediate to advanced
303 pages
4h 54m
Chinese
Content preview from Effective Modern C++（中文版）
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204
第
6
章
lambda
表达式
lambda
表达式（简称
lambda
式）能成为
C++
中极具颠覆性的语言特性，不免让人
感觉有些不可思议，因为它们并没有给语言注入新的表达力。任何
lambda
式能做到
的，你都能手工做到，无非要费力多打几个字。但是
lambda
式作为一种创建函数对
象的手段，实在太过方便，所以才会对
C++
日常软件开发产生极大的影响。如果不是
有了
lambda
式，
STL
中的“
_if
”族算法（例如，
std::find_of
、
std::remove_if
和
std::count_if
等）恐怕只会使用最平凡的谓词来调用，但有了
lambda
式以后，使用
复杂谓词来调用这些算法的应用便如雨后春笋般爆发了。这种情况同样发生在能够自
定义比较函数的算法族（例如，
std::sort
、
std::nth_element
和
std:;lower_bound
等）
上。在
STL
之外，
lambda
式也能够用来为
std::sort
和
std::sort
（参见条款
18
和
条款
19
）快速创建自定义析构器，还能以同样直接的程度对谓词做特化处理来提供条
件变量给线程
API
（参见条款
39
）。在标准库之外，
lambda
式可以临时制作出回调函数、
接口适配函数或是语境相关函数的特化版本以供一次性调用。有了
lambda
式的
C++
语言，确实变得更富有亲和力了。
围绕着
lambda
式的术语词汇可能比较让人迷惑。这里给出一些提醒：
• lambda
表达式，顾名思义，是表达式的一种。它是源代码组成部分，比如在下
面这段代码中高亮部分就是
lambda
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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.