c++类模板，全局函数的类外实现问题

Question

我用的vscode，运行时28行这里报错：redefinition of'<class T1,class T2> void printperson(person<T1,T2>&)
思考了半天没想到是哪里错了，希望有人能够指正。

#include<iostream>
#include<string>
using namespace std;
template<class T1,class T2>
class person;

template<class T1,class T2>
void printperson(person<T1,T2>&p)
{
    cout<<p.name<<"  "<<p.age<<endl;
}

template<class T1,class T2>
class person
{
    friend void printperson<>(person<T1,T2>&p);
    public:
    person(T1 name,T2 age)
    {
        this->name=name;
        this->age=age;
    }
    private:
    T1 name;
    T2 age;
};
template<class T1,class T2>
void printperson(person<T1,T2>&p)
{
    cout<<p.name<<"  "<<p.age<<endl;
}
void test()
{
    person<string,int>p("jerry",20);
    printperson(p);
}
int main()
{
    test();
    return 0;
}

Answer 1

提示函数定义重复了