使用print函數輸出重載的<<運算符？

Question

我已經成功地重載了'< <'運算符，我相信它被稱爲插入運算符。我有打印卡對象的實例的信息打印功能，我怎麼能調用這個打印功能，使用操作時

例如：

Card aCard("Spades",8); //generates an 8 of spades card object 

aCard.Print(); // prints the suit and value of card 

cout << aCard << endl; // will print something successfully but how can I get the same results as if I were to call the print function? 

我在執行文件card.cpp我已經超載用於我的卡類的< <。

Card.cpp

void Card::Print() 
{ 
    std::cout << "Suit: "<< Suit << std::endl; 
    std::cout << "Value:" << Value << std::endl; 
} 

std::ostream& operator<<(std::ostream &out, const Card &aCard) 
{ 
    Print();//this causes an error in the program 
} 

Card.h

class Card 
{ 
public:  
    std::string Suit; 
    int Value; 

    Card(){}; 
    Card(std::string S, int V){Suit=S; Value=V}; 

    void Print(); 

    friend std::ostream& operator<<(std::ostream&, const Card&) 
}; 

Answer 1

你只需要一個實現。你既可以使打印功能，它接受一個ostream，並執行所有的打印邏輯，然後從Print()和operator<<

void Card::Print() 
{ 
    Print(std::cout); 
} 

std::ostream& operator<<(std::ostream &out, const Card &aCard) 
{ 
    Print(out); 
} 

void Card::Print(std::ostream &out) 
{ 
    out << "Suit: "<< Suit << std::endl; 
    out << "Value:" << Value << std::endl; 
    return out; 
} 

叫它或者你可以有operator<<包含打印邏輯，並調用operator<<從Print：

void Card::Print() 
{ 
    std::cout << *this; 
} 

std::ostream& operator<<(std::ostream &out, const Card &aCard) 
{ 
    out << "Suit: "<< Suit << std::endl; 
    out << "Value:" << Value << std::endl; 
    return out; 
} 

Answer 2

您在operator<<不Print()

需要

你不說錯誤是什麼，但基本上你打電話給一個全局定義的Print()函數或函數，它不代表你的代碼存在。