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class_and_function_template

一 : 编写可变参数函数模版 函数模版和类模版(可变参数)可变数目的参数叫做: 参数包(模版参数包,函数参数包)

  1. 可变参数通常是递归的。  a) 第一步是调用处理包中的第一个实参,然后用剩余的实参调用自身。  b) 为了终止递归, 我们还需要定义一个非可变参数的同名函数。

Example: //不可变参数的函数模版 template ostream& print(ostream& os, const T& t) {     return os << t; //参数包中的最后一个元素之后,不打印分隔符 }

//可变参数的函数模版 template<typename T, typename...Args> ostream& print(ostream& os, const T& t, const Args&...rest) {     os << t << ", ";     //打印第一个实参 return print(os, rest...); }

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