グローバル関数クラス内およびクラス外実装

#include
#include
using namespace std;

//  Person 
template<class T1,class T2>
class Person;

//        
//      
//            
template<class T1,class T2>
void printPerson2(Person<T1,T2>p)
{
    cout<<"name 2: "<<p.m_Name<<endl;
    cout<<"age 2:  "<<p.m_Age<<endl;
}

template<class T1,class T2>
class Person
{
    //                  
    friend void printPerson(Person<T1,T2>p)
    {
        cout<<"name: "<<p.m_Name<<endl;
        cout<<"age:  "<<p.m_Age<<endl;
    }

    //         
    //                         
    friend void printPerson2<>(Person<T1,T2>p);

public:
    Person(T1 name,T2 age)
    {
        this->m_Name=name;
        this->m_Age=age;
    }

private:
    T1 m_Name;
    T2 m_Age;
};

void test01()
{
    Person<string,int> p1("Tom",18);
    printPerson(p1);
}

void test02()
{
    Person<string,int> p2("Amy",10);
    printPerson2(p2);
}

int main()
{
    test01();
    test02();
    return 0;
}