Invalid use of undefined type 'struct PelephonePH'

i have received in .cpp errors of invalid use of undefined struct PelephonePN, CellcomPN and so on and also error in .h errors of forward declaration of PelephonePN,...

#ifndef PHONE_H_INCLUDED
#define PHONE_H_INCLUDED
#include <iostream>
#include <ctime>
#include <string>
#include "phone.h"

using namespace std;

class PhoneNumber;
class PelephonePN;
class CellcomPN;
class OrangePN;
class HotPN;
class BezeqPN;

class PhoneManager
{
private:
    PelephonePN* mpPelephone;
    CellcomPN* mpCellcom;
    OrangePN* mpOrange;
    HotPN* mpHot;
    BezeqPN* mpBezeq;
public:
    PhoneManager();
    ~PhoneManager();
    void split_check_data(string str);
};

#endif

and .cpp

#include <iostream>
#include <ctime>
#include <string>
#include <sstream>
#include "phone_manager.h"
#include "phone.h"


using namespace std;

PhoneManager::PhoneManager()
{
    srand(time(0));
    mpPelephone = new PelephonePN();
    mpCellcom = new CellcomPN();
    mpOrange = new OrangePN();
    mpHot = new HotPN();
    mpBezeq = new BezeqPN();
    mpPelephone->add(mpCellcom);
    mpPelephone->add(mpOrange);
    mpPelephone->add(mpHot);
    m开发者_如何转开发pPelephone->add(mpBezeq);
    mpBezeq->setNext(mpPelephone);
}

To instantiate an object, forward declaration is just insufficient. Include the corresponding headers in the source file. In the body of the constructor, you are instantiating mpPelephone, ..... So, make sure that corresponding class headers can be seen in the translation unit.

In your .cpp source file you need to #include the headers that define class PelephonePN and its associates.

It is fine to forward-declare these classes in the header if you are only using them as pointers or references, but one you start using them in your implementation, you'll need to provide the compiler with the definition.

You can't use a forward declaration of a class to access its members (which includes the constructor, default or otherwise) or its size and without those two things, you can't instantiate an instance of that class.

You require its FULL implementation to do that, so in your .cpp file you need to include the header with the whole class PelephonePN {/* class body */}; section.

in the first file you have lines:

#ifndef PHONE_H_INCLUDED
#define PHONE_H_INCLUDED

I suppose you have same lines in phone.h, please check...

Are your PelephonePN and co. in a particular namespace? If so, predeclarations must all be in the same namespace. Since you added a using namespace std (sigh), my guess is that phone.h is defining your classes inside the namespace std (I hope it doesn't, but that's another thing). If so, your predeclarations must be: namespace std { class PelephonePN; }

Btw, what is a pelephone??? O.O