c++之类模板和函数模板的区别

#include<iostream>
using namespace std;

template<class NameType,class AgeType=int>
class Person {
public:
    NameType name;
    AgeType age;
    Person(NameType name, AgeType age) {
        this->name = name;
        this->age = age;
    }
};

void test() {
    //Person<> p("tom",22);无法自动类型推导，只能显示指明类型
    Person<string,int> p("tom",22);
    cout << p.name << " " <<p.age << endl;
    //可以先在参数中声明类型，这里就可以不指明了
    Person<string> p2("jack", 23);
    cout << p2.name << " " << p2.age << endl;
}

int main() {
    test();
    system("pause");
    return 0;
}