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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6.3.1 函数模板
对于任何可用范围for遍历的序列（如容器），可编写如下函数计算其元素值的和：
模板参数Value和函数参数v使得调用者可以指定累加器（用于求和的变量）的类型和初始值：
将一些int累加到一个double中是为了得体地处理超出int表示范围的数值。注意sum<Sequence，Value>的模板参数类型是如何根据函数实参推断出来的。幸运的是，我们无须显式地指明这些类型。
这里的sum（）可以看作标准库accumulate（）的简化版本（参见13.4节）。
函数模板可以用于成员函数，但不能是virtual成员。因为编译器不知道这种模板在程序中有哪些实例，因此无法为其生成vtbl（参见4.4节）。
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