Question

我写了一个基于班级的机场：D !!那包含飞机＆amp;所有这些类必须是一个叫做fly的大类中的对象，但是当我在fly类中创建这个对象时，给出这个错误：

错误：字段＆＃39; flyairplane＆＃39;有不完整的类型错误：字段＆＃39; flypilot＆＃39;有不完整的类型。。

#include <iostream>
#include <sstream>
using namespace std;

/*    Prototypes   */

class date;
class Time;
class passenger;
class pilot;
class fly;
class Airplane;
class Destination;
class lane;
class Time;
class era;
class priorityQueue;





/*     class defines    */


class fly{
public:
void setflyserialNumber(string serial){
    flySerialNumber = serial;
}
void setAirPlane(Airplane a){
    flyairplane = a;
  }
  void setPilot(pilot p){
      flyPilot = p;
   }
  void setflyEra(era E){
     airplaneEra = E;
  }
  void setflyDestination(Destination D){
    airplaneDestination = D;

}
void setflyTime(Time t){
    flyTime = t;
}
void setflyDate(date D){
    flyDate = D;
}
void setPassengerNumber(int a){
passengerNumber = a ;
}
void setNumberOfWaiters(int  n){
numberOfWaiters = n ;
}
string getFlySerialNumber(){
    return flySerialNumber;
}

string getPriority(){
 stringstream stm; // crisis$fuel$flyDuration$sitnumbers$
 stm << flyairplane.getCrisisState()<< "$"<< flyairplane.getExistFuel()<< "$" << flyDuaration << "$" << flyairplane.sitNumber <<"$" ;
 return stm.str();

}

private:
string flySerialNumber;

Airplane flyairplane;
pilot flyPilot;
 /* fly contributes  */
era airplaneEra;
Destination airplaneDestination;
date flyDate;
Time flyTime;
int passengerNumber;
int numberOfWaiters;
int flyDuaration;

};

class passenger {

public :
passenger(){};
passenger(string n ,string fn , long int nc,date * bt ){
name = n ;

familyName = fn;
nationCode = nc ;
birthDate = bt;
}
void setName(string nm , string fn){
    name = nm ;
    familyName = fn ;
}
string getName(){

stringstream stm;
stm << name << " " << familyName ;
return stm.str();
}
void SetNationalCode(long int Nc) {
nationCode = Nc ;
}
long int getNationalCode(){
return nationCode;

}
private:
string name;
string familyName;
long int nationCode;
date *birthDate;
};



class pilot{
private :
string name;
string family;
int personallyCode;
date *birthDate;
date *empDate;
string Degree;
int flyTimeDuration;

public :
pilot(){};
pilot(string n , string famil , int persoalCode , date *birthD , date *empd , string deg ,int     flyTimeDur){

name = n;
family = famil;
personallyCode = persoalCode;
birthDate = birthD ;
empDate = empd ;
Degree = deg;
flyTimeDuration = flyTimeDur ;


}



};
class era{
public:
string eraname;
// location in coordinate system can define here
date flyDate;
Time flyTime;
};
class Destination{
public:
string destinationName;
// location in coordinate system can define here
date flyDate;
Time flyTime;
};
class date{

public:

int day;
int month;
int year;
date(){};
~date(){};
string dateToserial()
 {
    stringstream stm;
   stm << year << month << day;
   return stm.str();
 }

  int dateToNumber(){
  int t = day + month + year ;
  return t;

  }

   };
   class Time{

 public :
 Time(int h , int mins , int sec){
 hour = h;
 minute = mins;
 second = sec;
 }
 Time(){}
 int hour;
 int minute;
int second;
 };
  class Airplane{
 //friend class fly;
  public :
  Airplane(){    }
  Airplane(string name,date *genesis,int sitnum , int weight ,string moedl ,string produceFactor ,       int motors ,float fuelcapacity ){
   AirplaneName = name;
   genesisYear = *genesis;

    }

// void addPassenger(Passenger pass);
   string getState (){
   stringstream tstm;
   tstm << "fuelValue : "<<  fuelCapacity << " passengerNumber:"<<passangerNumbers ;
   return tstm.str();

   }
  string getAirplaneSerialnumber(){
    stringstream tempstr;
    tempstr << genesisYear.dateToserial() << weight << motorNumber << fuelCapacity;
    return tempstr.str();

   }
   void setexistfuel(float f){
   existFuel = f;

   }
   float getExistFuel(){
   return existFuel;
   }
   void setCrisisState(bool b){
   crisis = b;
   }
   bool getCrisisState(){
   return crisis;
   }
  private:
  bool crisis = false;
  string AirplaneName;
  string serialNumber;
  date genesisYear;
  int sitNumber;
  int passangerNumbers;
  int weight;
  string modelType;
  string producerFactory;
 int motorNumber;
  float fuelCapacity;
  float existFuel;

  };
class lane{
 public:
    lane();
    lane(string lsn , int cap , bool state , bool pstate)
    {
    laneSerialNumber=lsn;
    capacity = cap;
    status = state;
    portStatus = pstate;
    usedCapacity=0;
  //ctor
    }
    ~lane()
    {
  //dtor
      }
     int capacity;
    int usedCapacity;
    bool status;
    bool portStatus;
    int discharingTime;
    void setport(bool ps)
     {
         if(ps) portStatus=true; // takeOff
        else
             portStatus = false; // landing

    }
    void setStatus(bool state)
    {
        if(state) status = true;
        else
             status = false;

    }
    bool getStatus()
    {
      return status;
    }
    void setlaneSerialNumber(string lsn)
    {
    laneSerialNumber=lsn;
    }
    string getlaneSerialNumber()
    {
        return laneSerialNumber;
    }
    string toString()
    {
        stringstream stm;
        stm << laneSerialNumber << "{ "<< "Capacity : "<< capacity<< " used :"<<usedCapacity<<" _ Status : "<<status << " _ Direcion : "<< portStatus << " _ DischaringTime" <<discharingTime << endl;
        return stm.str();
    }
    string generatelaneSerialNumber()
    {
        stringstream stm;
        stm << capacity << usedCapacity << status << portStatus << discharingTime;
        laneSerialNumber = stm.str();
        return stm.str();

    }

protected:
private:
    string laneSerialNumber="";

  };
 class manager{
 // priority_queues for takeoff & landing
 // return value of the takeoff queue at time to watchtower
 // get the Objects for landing from watchtower then add it to queue by priority
 // manage priority of queue in dangerous occasions return last priority to watchtower to landing
 /*  Objects contents */
 // in every queue object there is a fly object that contain name & etc of air plane
 // & there is a number that is  combined from fuel value & Events type of landing , that created     by watchtower

 public :

 };



/*   Global functions    */

int main()
{
lane lane1("lane1",3,true,true);
Airplane plane1;

cout << "\n";
cout << lane1.generatelaneSerialNumber() << endl;
cout << "\n";
cout << lane1.toString() << endl;
cout << plane1.getState();
return 0;
}

有人可以帮忙吗？谢谢！

Answer 1

在C ++中，如果对象是成员变量，则不能使用前向声明。

以下是关于何时可以使用正向声明的帖子：When can I use a forward declaration?

一个简单的解决方法是在类Fly之前指定所有类，但是你应该做的是在自己的文件中创建所有类（头和cpp，用于声明和定义）和#include必要的头文件。

Answer 2

因为试点类是向前宣布的。

Airplane flyairplane;
pilot flyPilot;


...



class pilot{
private :
string name;
string family;
int personallyCode;
date *birthDate;
date *empDate;
string Degree;
int flyTimeDuration;

public :
pilot(){};
pilot(string n , string famil , int persoalCode , date *birthD , date *empd , string deg ,int     flyTimeDur){

name = n;
family = famil;
personallyCode = persoalCode;
birthDate = birthD ;
empDate = empd ;
Degree = deg;
flyTimeDuration = flyTimeDur ;


}

尝试不使用前向声明

错误：字段在C ++中具有不完整的类型

2 个答案: