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Require help to solve!!!

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Re: Require help to solve!!!

 
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  #11
May 29th, 2009
Presently my files are:
testA.h
C++ Syntax (Toggle Plain Text) 
  1. #include <stdio.h>
  2. #include "testB.h"
  3.  
  4. class TestA {
  5.   public:
  6.     TestA();
  7.     int id; 
  8.     TestB* b;
  9.     void testPrint();
  10.     void test();
  11.     void set(TestB* t);
  12. };
testA.C
C++ Syntax (Toggle Plain Text) 
  1. #include "testA.h"
  2.  
  3. void TestA::testPrint() {
  4.   printf("I am in class TestA\n");
  5. }
  6.  
  7. TestA::TestA() {
  8.   id = 1;
  9. }
  10.  
  11. void TestA::set(TestB* t) {
  12.   b = t;
  13. }
  14.  
  15. void TestA::test() {
  16.   printf("My ID is: %d and the other ID is: %d\n", this->id, b->id);
  17. }
testB.h
C++ Syntax (Toggle Plain Text) 
  1. #include <stdio.h>
  2. class TestA;
  3. class TestB {
  4.   public:
  5.     TestB();
  6.     TestA* a;
  7.     int id;
  8.     void testPrint();
  9.     void test();
  10.     void set(TestA* t);
  11. };
testB.C
C++ Syntax (Toggle Plain Text) 
  1. #include "testB.h"
  2.  
  3. void TestB::testPrint() {
  4.   printf("I am in class TestB\n");
  5. }
  6.  
  7. TestB::TestB() {
  8.   id = 2;
  9. }
  10.  
  11. void TestB::set(TestA* t) {
  12.   a = t;
  13. }
  14.  
  15. void TestB::test() {
  16.   printf("My ID is: %d and the other ID is: %d\n", this->id, a->id);
  17. }

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!!!
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Re: Require help to solve!!!

 
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  #12
May 29th, 2009
Include testA.h in testB.h if you want it to have a pointer to a testA object
All i've got is a slice of pi
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Re: Require help to solve!!!

 
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  #13
May 29th, 2009
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!!!
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Re: Require help to solve!!!

 
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  #14
May 29th, 2009
You should always include the header when you want to use it's class to avoid multiple inclusion add the following code.

#ifdef TESTB_H
#define TESTB_H

//class declaration

#endif

And remove testA declaration in testB.h
All i've got is a slice of pi
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Re: Require help to solve!!!

 
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  #15
May 29th, 2009
Ok...
My files are like this now:
testA.h
C++ Syntax (Toggle Plain Text) 
  1. #ifndef __TESTA_H
  2. #define __TESTA_H
  3.  
  4. #include <stdio.h>
  5. #include "testB.h"
  6.  
  7. class TestA {
  8.   public:
  9.     TestA();
  10.     void testPrint();
  11.     void test();
  12.     void set(TestB* t);
  13.     int getID();
  14.  
  15.   private:
  16.     int id;
  17.     TestB* b;
  18. };
  19.  
  20. #endif
testB.h
C++ Syntax (Toggle Plain Text) 
  1. #ifndef __TESTB_H
  2. #define __TESTB_H
  3.  
  4. #include <stdio.h>
  5. #include "testA.h"
  6.  
  7. class TestB {
  8.   public:
  9.     TestB();
  10.     void testPrint();
  11.     void test();
  12.     void set(TestA* t);
  13.     int getID();
  14.  
  15.   private:
  16.     int id;
  17.     TestA* a;
  18. };
  19.  
  20. #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.
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Re: Require help to solve!!!

 
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  #16
May 29th, 2009
Are you sure you want to have a pointer of the other class in them both?
All i've got is a slice of pi
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Re: Require help to solve!!!

 
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  #17
May 29th, 2009
Yes...that's my primary requirement for this post.
Otherwise I could have dealt with this situation!!!
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Re: Require help to solve!!!

 
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  #18
May 29th, 2009
OK last try
CPP Syntax (Toggle Plain Text) 
  1. class TestA;
  2. #ifndef __TESTA_H
  3. #define __TESTA_H
  4.  
  5. #include <stdio.h>
  6. #include "testB.h"
  7.  
  8. class TestA {
  9.   public:
  10.     TestA();
  11.     void testPrint();
  12.     void test();
  13.     void set(TestB* t);
  14.     int getID();
  15.  
  16.   private:
  17.     int id;
  18.     TestB* b;
  19. };
  20.  
  21. #endif
All i've got is a slice of pi
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Re: Require help to solve!!!

 
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  #19
May 29th, 2009
It's working!!!
Thanks a lot...You really fixed my issue
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Re: Require help to solve!!!

 
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  #20
May 29th, 2009
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.
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