程式語言教學

按此前往C++完整教學目錄

多參數樣板函式：可以宣告多個樣板參數型別，讓一個樣板函式可以輸入多個樣板參數，如：

class jewelry // 建立一類別jewelry

{          

    public:

    int price;

    string kind;

    jewelry(string kind_,int price_){kind=kind_;price=price_;}

};

class car  //建立一類別car

{   

    public:

    int price;

    string kind;

    car(string kind_,int price_){kind=kind_;price=price_;}

};

class art  //建立一類別art

{          

public:

    int price;

    string kind;

    art(string kind_,int price_){kind=kind_;price=price_;}

};

template <class X, class Y>   //宣告樣板參數型別X,Y

void which_is_more_valuable(X x,Y y) //宣告樣板函式which_valuable

{       

if(x.price>y.price){cout<<x.kind<<" is valuable than "<<y.kind<<endl;}

    else if(x.price<y.price){cout<<y.kind<<" is valuable than "<<x.kind<<endl;}

    else {cout<<"same";}

}

int main()  //主程式在此

{   

jewelry j1("ruby",500);

car c1("ford",600);

art a1("paint",700);

which_is_more_valuable (j1,c1);  //顯示：ford is valuable than ruby

which_is_more_valuable (a1,c1);  //顯示：paint is valuable than ford 

}

由以上可知，樣板函式which_is_more_valuable可以輸入兩個樣板參數，而且不限所輸入的參數型別，此乃樣板函式之功效所在。

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