模板函数和模板类

模板技术：本质：把类型作参数

模板函数:

template <typename T1,typename T2>　　//还能用class代替typename
T1 add(T1 num1,T2 num2)　　//这是一个模板函数
{
    cout<<"T1 add(T1 num1,T2 num2)"<<endl;
    return num1 + num2;
}

int main()
{
    int a=1,b=2;
    float f1=3.2f,f2=4.9f;
    int res = add(a,f1);
    float res2 = add(f2,b);
    cout<<res<<endl<<res2<<endl;
}　　　　　　　　

模板类：

template <typename T1,typename T2>
class Student
{
public:
    Student()
    {
        cout << "Student()" << endl;
        this->name = " ";
        this->age = 0;
    }

    Student(const T1 &name,const T2 &age);
    void showStu()const;

private:
    T1 name;
    T2 age;
};

template <typename T1,typename T2>
Student<T1,T2>::Student(const T1 &name,const T2 &age)
{
    cout<<"Student::Student(const T1 &name,const T2 &age)"<<endl;
    this->name = name;
    this->age = age;
}

template <typename T1,typename T2>
void Student<T1,T2>::showStu()const
{
    cout<<"void Student::showStu()const"<<endl;
    cout<<this->name<<" "<<this->age<<endl;;
}

int main()
{
    Student<string ,int> stu("zhangsan",22);
    stu.showStu();

    Student<int,string> stu1(23,"lisi");
    stu1.showStu();
}