C++模板的特化

demo.h

#pragma  once

#include <cstring>

// 函数的特化
template <class T>
T max(T a, T b){
    return a > b ? a : b;
}

template<>
char* max(char* a, char *b){
    return strcmp(a, b) > 0 ? a : b;
}

// 类内某函数的特化
template<class T>
class Demo{
private:
    T pt1, pt2;
public:
    Demo(T p1, T p2) :pt1(p1), pt2(p2){}
    T max() const {
        return pt1 > pt2 ? pt1 : pt2;
    }
};

template<>
char* Demo<char*>::max()const{
    return strcmp(pt1, pt2) > 0 ? pt1 : pt2;
}

main.cpp

#include <iostream>
#include <string>
#include "demo.h"

using namespace std;

int main(){
    cout << max<string>("aaa", "bbb") << endl;
    cout << max<char*>("ccc", "ddd") << endl;

    Demo<string> demo("aaa","bbb");
    cout << demo.max() << endl;

    Demo<char*> obj("ccc","ddd");
    cout << obj.max() << endl;
    return 0;
}

/*
OUTPUT:
    bbb
    ddd
    bbb
    ddd
*/