August 2021
Intermediate to advanced
450 pages
5h 35m
Chinese
Content preview from C++语言导学（原书第2版）
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6.4.2 别名
令人惊讶的是，为类型或模板引入代名词常常是很有用的。例如，标准头文件<cstddef>包含了别名size_t的定义，可能如下：
size_t的实际类型是依赖于实现的，因此在另一个实现中size_t可能是一个unsigned long。有了别名size_t，程序员就可以编写出可移植的代码。
对参数化类型来说，一种非常常见的方式是为与模板实参相关的类型提供一个别名。例如：
实际上，每个标准库容器都会提供一个value_type作为其值类型的名字（参见第11章）。这令我们可编写出能用于任何遵循这种规范的容器的代码。例如：
通过绑定一些或所有模板实参，别名机制可以用来定义一个新模板。例如：
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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.