#include<iostream>
#include<string>
using namespace std;template<class T1,class T2>
class Car;//全局函数不用作用域
template<class T1,class T2>
void printCar2(Car<T1,T2> p)
{cout << "类外实现：name = " << p.c_name << " age = " << p.c_age << endl;
}
template<class T1,class T2>
class Car
{//全局函数类内实现friend void printCar(Car<T1,T2> p){cout << "类内实现：name = " << p.c_name << " age = " << p.c_age << endl;}// 全局函数类外实现  ：// 加一个空模板的参数列表<>// 如果全局函数类外实现，需要让编译器提前知道这个函数存在friend void printCar2<>(Car<T1,T2> p);public:Car(T1 name,T2 age){this->c_age = age;this->c_name = name;}T1 c_name;T2 c_age;
};void test_16()
{Car<string,int> c("tom",3);printCar(c);printCar2(c);
}int main()
{test_16();
}