August 2021
Intermediate to advanced
450 pages
9h 36m
Chinese
Content preview from C++程序设计：原理与实践（基础篇）（原书第2版）
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14.3.1 类型作为模板参数
我们希望令元素类型成为vector的参数。因此，我们将vector中的double用T代替——T是一个参数，能被赋予double、int、string、vector<Record>和Window*之类的“值”。在C++中引入类型参数T的语法为template<typename T>前缀，其含义是“对所有类型T”。例如：
这个定义就是将14.2.6节中的double值vector中的double替换为模板参数T而得到的。我们可以像下面这样使用类模板vector：
当我们使用模板时，可以认为编译器是按照如下方式生成类的：用实际类型（模板实参）取代模板参数。例如，当编译器遇到代码中的vector<char>时，它将（在某处）生成如下代码：
对于vector<double>，编译器生成的大致就是14.2.6节中的（double的）vector（使用一个合适的内部名字来表示vector<double>）。 ...
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