C++模板的应用

1、先看类模板的应用，直接上例子：

#include <iostream>
using namespace std;

template <typename T>
typename Compare
{
public:
    Compare(T a, T b)
    {
        this->x = a;
        this->y = b;
    }

    T max()
    {
        return x>y?x:y;
    }
    T min()
    {
        return x<y?x:y;
    }
    T sayHello();
    //{
    //    cout<<sizeof(T)<<endl;
    //}
private:
    T x,y;
};

template <typename T>
T Compare<T>::sayHello()
{
    cout<<sizeof(T)<<endl;
}

int main()
{
    Compare<int> cmp1(3,7);
    cout<<cmp1.max()<<endl;
    cout<<cmp1.min()<<endl;
    Compare<float> cmp2(1.1,2.2);
    cout<<cmp2.max()<<endl;
    cout<<cmp2.min()<<endl;
    cmp1.sayHello();

}

其实跟C#中的也没什么区别，只不过当在外部定义的时候有小小要注意的地方。

2、普通类中定义模板函数

#include <iostream>
using namespace std;

class Compare
{
public:
    template <typename T>
    void sayHello();
    //{
    //    cout<<sizeof(T)<<endl;
    //}

};

template <typename T>
void Compare::sayHello()
{
    cout<<sizeof(T)<<endl;
}
int main()
{
    Compare cmp1;
    cmp1.sayHello<int>();

}

也是清晰易懂简单明了