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May 29th, 2009

Re: Require help to solve!!!

Presently my files are:
testA.h

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
#include "testB.h"
 
class TestA {
  public:
    TestA();
    int id; 
    TestB* b;
    void testPrint();
    void test();
    void set(TestB* t);
};
#include <stdio.h>
#include "testB.h"

class TestA {
  public:
    TestA();
    int id; 
    TestB* b;
    void testPrint();
    void test();
    void set(TestB* t);
};

testA.C

C++ Syntax (Toggle Plain Text)
#include "testA.h"
 
void TestA::testPrint() {
  printf("I am in class TestA\n");
}
 
TestA::TestA() {
  id = 1;
}
 
void TestA::set(TestB* t) {
  b = t;
}
 
void TestA::test() {
  printf("My ID is: %d and the other ID is: %d\n", this->id, b->id);
}
#include "testA.h"

void TestA::testPrint() {
  printf("I am in class TestA\n");
}

TestA::TestA() {
  id = 1;
}

void TestA::set(TestB* t) {
  b = t;
}

void TestA::test() {
  printf("My ID is: %d and the other ID is: %d\n", this->id, b->id);
}

testB.h

C++ Syntax (Toggle Plain Text)
#include <stdio.h>
class TestA;
class TestB {
  public:
    TestB();
    TestA* a;
    int id;
    void testPrint();
    void test();
    void set(TestA* t);
};
#include <stdio.h>
class TestA;
class TestB {
  public:
    TestB();
    TestA* a;
    int id;
    void testPrint();
    void test();
    void set(TestA* t);
};

testB.C

C++ Syntax (Toggle Plain Text)
#include "testB.h"
 
void TestB::testPrint() {
  printf("I am in class TestB\n");
}
 
TestB::TestB() {
  id = 2;
}
 
void TestB::set(TestA* t) {
  a = t;
}
 
void TestB::test() {
  printf("My ID is: %d and the other ID is: %d\n", this->id, a->id);
}
#include "testB.h"

void TestB::testPrint() {
  printf("I am in class TestB\n");
}

TestB::TestB() {
  id = 2;
}

void TestB::set(TestA* t) {
  a = t;
}

void TestB::test() {
  printf("My ID is: %d and the other ID is: %d\n", this->id, a->id);
}

I am able to compile g++ -c testA.C without any problems.
But g++ -c testB.C is giving multiple declarations error!!
How to fix this issue??

Thanks!!!

abhishek2301

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May 29th, 2009

Re: Require help to solve!!!

Include testA.h in testB.h if you want it to have a pointer to a testA object

mostermand

Reputation Points: 12

Solved Threads: 1

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May 29th, 2009

Re: Require help to solve!!!

Sorry!!!
It wont work that way since I have already included testB.h in testA.h and so can't include again the other way.
I initially posted this problem but then someone corrected me and now I am able to compile testA.C but not testB.C
If you go through the entire thread trail then you will come to know!!!

abhishek2301

Reputation Points: 10

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May 29th, 2009

Re: Require help to solve!!!

You should always include the header when you want to use it's class to avoid multiple inclusion add the following code.

(Toggle Plain Text)

#ifdef TESTB_H
#define TESTB_H

//class declaration

#endif

And remove testA declaration in testB.h

mostermand

Reputation Points: 12

Solved Threads: 1

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May 29th, 2009

Re: Require help to solve!!!

Ok...
My files are like this now:
testA.h

C++ Syntax (Toggle Plain Text)
#ifndef __TESTA_H
#define __TESTA_H
 
#include <stdio.h>
#include "testB.h"
 
class TestA {
  public:
    TestA();
    void testPrint();
    void test();
    void set(TestB* t);
    int getID();
 
  private:
    int id;
    TestB* b;
};
 
#endif
#ifndef __TESTA_H
#define __TESTA_H

#include <stdio.h>
#include "testB.h"

class TestA {
  public:
    TestA();
    void testPrint();
    void test();
    void set(TestB* t);
    int getID();

  private:
    int id;
    TestB* b;
};

#endif

testB.h

C++ Syntax (Toggle Plain Text)
#ifndef __TESTB_H
#define __TESTB_H
 
#include <stdio.h>
#include "testA.h"
 
class TestB {
  public:
    TestB();
    void testPrint();
    void test();
    void set(TestA* t);
    int getID();
 
  private:
    int id;
    TestA* a;
};
 
#endif
#ifndef __TESTB_H
#define __TESTB_H

#include <stdio.h>
#include "testA.h"

class TestB {
  public:
    TestB();
    void testPrint();
    void test();
    void set(TestA* t);
    int getID();

  private:
    int id;
    TestA* a;
};

#endif

On compiling g++ -Wall -c testA.C

testB.h:12: error: ‘TestA’ has not been declared
testB.h:17: error: ISO C++ forbids declaration of ‘TestA’ with no type
testB.h:17: error: expected ‘;’ before ‘*’ token

On compiling g++ -Wall -c testB.C

testA.h:12: error: ‘TestB’ has not been declared
testA.h:17: error: ISO C++ forbids declaration of ‘TestB’ with no type
testA.h:17: error: expected ‘;’ before ‘*’ token

Please help to fix this issue!!!

Last edited by abhishek2301; May 29th, 2009 at 3:45 pm.

abhishek2301

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Solved Threads: 0

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May 29th, 2009

Re: Require help to solve!!!

Are you sure you want to have a pointer of the other class in them both?

mostermand

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May 29th, 2009

Re: Require help to solve!!!

Yes...that's my primary requirement for this post.
Otherwise I could have dealt with this situation!!!

abhishek2301

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May 29th, 2009

Re: Require help to solve!!!

OK last try

CPP Syntax (Toggle Plain Text)
class TestA;
#ifndef __TESTA_H
#define __TESTA_H
 
#include <stdio.h>
#include "testB.h"
 
class TestA {
  public:
    TestA();
    void testPrint();
    void test();
    void set(TestB* t);
    int getID();
 
  private:
    int id;
    TestB* b;
};
 
#endif
class TestA;
#ifndef __TESTA_H
#define __TESTA_H

#include <stdio.h>
#include "testB.h"

class TestA {
  public:
    TestA();
    void testPrint();
    void test();
    void set(TestB* t);
    int getID();

  private:
    int id;
    TestB* b;
};

#endif

mostermand

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Solved Threads: 1

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May 29th, 2009

Re: Require help to solve!!!

It's working!!!
Thanks a lot...You really fixed my issue

abhishek2301

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May 29th, 2009

Re: Require help to solve!!!

Dear you make two header files. One as a setA.h and other one as a setB.h. Now include both of the header files in your cpp file.
#include<iostream>
#include"setA.h"
#include"setB.h"

I hope you understand my wording.

mirfan00

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Solved Threads: 2

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