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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7.4.2 参数转发
可变参数模板的一个重要用途是通过接口不加改变地传递实参。考虑一个网络输入通道的概念，其真正的传输值的方法是一个传输参数。不同的传输机制有着不同的构造函数参数集：
标准库函数forward（）（参见13.2.2节）用于将实参从InputChannel构造函数不加改变地移动到Transport构造函数。
这里的关键点是，InputChannel的编写者可以构造一个Transport类型的对象，而无须知道构造一个特定Transport所需的实参。InputChannel的实现者只需知道所有Transport对象的公共用户接口。
转发在基础库中非常常见，因为在其中通用性和低运行时额外开销是必需的，而且很通用的接口非常常见。
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