06_模板的局限性.cpp

#include <iostream>
#include <string>
using namespace std;

// 模板的局限性

class Person
{
public:
    Person(string name, int age)
    {
        this->m_Name = name;
        this->m_Age = age;
    }
    string m_Name;
    int m_Age;
};

// 对比两个数据是否相等的函数
template <typename T>
bool myCompare(T &a, T &b)
{
    if (a == b)
    {
        return true;
    }
    else
    {
        return false;
    }
}

void test01()
{
    int a = 10;
    int b = 20;

    bool ret = myCompare(a, b);
    if (ret)
    {
        cout << "a == b" << endl;
    }
    else
    {
        cout << "a != b" << endl;
    }
}

// 利用具体化Person的版本实现代码，具体化优先调用
template <>
bool myCompare(Person &p1, Person &p2)
{
    if (p1.m_Name == p2.m_Name && p1.m_Age == p2.m_Age)
    {
        return true;
    }
    else
    {
        return false;
    }
}

void test02()
{
    Person p1("Tom", 10);
    Person p2("Tom", 10);

    bool ret = myCompare(p1, p2);
    if (ret)
    {
        cout << "p1 == p2" << endl;
    }
    else
    {
        cout << "p1 != p2" << endl;
    }
}

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