C++friend类内类外实现

#include 
using namespace std;

//类外实现步骤比较麻烦
template 
class p;

template 
void shows(p p1) {
	cout << "姓名：" << p1.name << endl << "年龄" << p1.age << endl;
}

template 
class p {
	//全局函数类内实现
	friend void show(p p1) {
		cout << "姓名：" << p1.name << endl << "年龄" << p1.age << endl;
	}
	friend void shows<>(p p2);
public:
	p(C1 name, C2 age) {
		this->name = name;
		this->age = age;
	}
private :
	C1 name;
	C2 age;
};

int main() {
	cout << "全局函数类内实现" << endl;
	pp1("张三",20);
	show(p1);
	cout << "全局函数类外实现" << endl;
	pp2("tom", 20);
	shows(p2);
}