작문의 복사 생성자는 어떻게 작성합니까?

Question

이 아래에있는 내 코드 :이 코드를 실행하면

class Pulley{ 
private: 
    int noOfTeeth; 

public: 
    Pulley(); 
    Pulley(int teeth); 
    ~Pulley(); 

    void show(); 
}; 

Pulley::Pulley() 
{ 
    cout << "Pulley constructor called!"; 
    noOfTeeth = 0; 
} 

Pulley::Pulley(int teeth) 
{ 
    cout << "Pulley constructor called!"; 
    noOfTeeth = teeth; 
} 

void Pulley::show() 
{ 
    cout << "\n\nNo of Teeths of Pulley: " << noOfTeeth; 
} 

Pulley::~Pulley() 
{ 

} 

class GearBox{ 
    private: 
    char *transmission; 
    Pulley p; 

    public: 
    GearBox(); 
    GearBox(char *trans, int pTeeth); 
    ~GearBox(); 

    void show(); 
}; 

GearBox::GearBox(): p() 
{ 
    cout << "Gearbox constructor called!"; 
    transmission = NULL; 
} 

GearBox::GearBox(char *trans, int pTeeth): p(pTeeth) 
{ 
    cout << "Gearbox constructor called!"; 
    if(trans != NULL) 
    { 
     transmission = new char[strlen(trans)+1]; 
     strcpy(transmission, trans); 
    } 
    else 
    { 
     transmission = NULL; 
    } 
} 

void GearBox::show() 
{ 
    cout << "\n\nTransmission of vehicle: " << transmission; 
    p.show(); 
} 

GearBox::~GearBox() 
{ 

} 

class Vehicle{ 
private: 
    char *model; 
    char *color; 
    GearBox g; 

public: 
    Vehicle(); 
    Vehicle(char *mod, char *col, char *gr); 
    Vehicle(const Vehicle &vh); 
    ~Vehicle(); 

    void show(); 
}; 

Vehicle::Vehicle(): g() 
{ 
    cout << "Vehicle constructor called!"; 
    model = NULL; 
    color = NULL; 
} 

Vehicle::Vehicle(char *mod, char *col, char *gr): g(gr) 
{ 
    cout << "Vehicle constructor called!"; 
    if(mod != NULL) 
    { 
     model = new char[strlen(mod)+1]; 
     strcpy(model, mod); 
    } 
    else 
    { 
     model = NULL; 
    } 

    if(col != NULL) 
    { 
     color = new char[strlen(col)+1]; 
     strcpy(color, col); 
    } 
    else 
    { 
     color = NULL; 
    } 
} 

void Vehicle::show() 
{ 
    cout << "\n\nModel of Vehicle: " << model; 
    cout << "\n\nColor of Vehicle: " << color; 
    g.show(); 
} 

int main() 
{ 
    Pulley p(20); 
    GearBox g("Manual", p); 
    Vehicle V("Honda", "Black", g); 
    V.show(); 
    system("PAUSE"); 
} 

지금, 나는 오류의 제비를 얻을, 나는 그 해결 방안을 무엇인지 모른다. 내가 이해 한 한 가지 오류는 Copy Constructor의 것이므로 아무도 내가 transmission, model and color 문자에 대한 포인터 용 복사 생성자를 쓸 수 있다는 것을 설명 할 수있다. 또한 다른 오류를 해결하는 방법을 알려주십시오. 고마워.

Answer 1

는 다음과 같이하십시오 : 당신이 코드를 작성할 때, 완벽하게 작동 작고 간단한 무언가 시작

#include <string> 
#include <iostream> 

class Pulley{ 
private: 
    int noOfTeeth; 

public: 
    Pulley(int teeth = 0); 

    void show(); 
}; 

Pulley::Pulley(int teeth) 
: noOfTeeth(teeth) 
{ 
    std::cout << "Pulley constructor called!"; 
} 

void Pulley::show() 
{ 
    std::cout << "\n\nNo of Teeths of Pulley: " << noOfTeeth; 
} 

class GearBox{ 
    private: 
    std::string transmission; 
    Pulley p; 

    public: 
    GearBox(std::string trans = std::string(), Pulley p = Pulley()); 

    void show(); 
}; 

GearBox::GearBox(std::string trans, Pulley p) 
: transmission(std::move(trans)) 
, p(std::move(p)) 
{ 
    std::cout << "Gearbox constructor called!"; 
} 

void GearBox::show() 
{ 
    std::cout << "\n\nTransmission of vehicle: " << transmission; 
    p.show(); 
} 

class Vehicle{ 
private: 
    std::string model; 
    std::string color; 
    GearBox g; 

public: 
    Vehicle(); 
    Vehicle(std::string mod = "", std::string col = "", GearBox gr = GearBox()); 

    void show(); 
}; 

Vehicle::Vehicle(std::string mod,std::string col, GearBox gr) 
: model(std::move(mod)) 
, color(std::move(col)) 
, g(std::move(gr)) 
{ 
    std::cout << "Vehicle constructor called!"; 
} 

void Vehicle::show() 
{ 
    std::cout << "\n\nModel of Vehicle: " << model; 
    std::cout << "\n\nColor of Vehicle: " << color; 
    g.show(); 
} 

int main() 
{ 
    Pulley p(20); 
    GearBox g("Manual", p); 
    Vehicle V("Honda", "Black", g); 
    V.show(); 
// system("PAUSE"); 
}