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Error C2440 and C2504
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Join Date: Dec 2008
Posts: 41
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Light Poster
Hi to all
I have a project, and I found 2 the errors in derived class,
says the first:
'BaseClass' : base class undefined
the number of error is :Error C2504:
and I include the file:
#include "BaseClass.h"
and make declare base class with extern.
but still the error.
.........................
says the second:
'cannot convert from 'DerivedClass **' to 'BaseClass **'.
if I make pointer from base point to derived
// declaration
BaseClass ** PointerBaseClass;
//initialization
PointerBaseClass = new DerivedClass * [size];
// this is code make in another class
the number of error is :error C2440:
Have you got any idea ?
the msdn help is not really clear,
I have made a lot of tries but no issue ....
Thank's for your time ...
I have a project, and I found 2 the errors in derived class,
says the first:
'BaseClass' : base class undefined
the number of error is :Error C2504:
and I include the file:
#include "BaseClass.h"
and make declare base class with extern.
but still the error.
.........................
says the second:
'cannot convert from 'DerivedClass **' to 'BaseClass **'.
if I make pointer from base point to derived
// declaration
BaseClass ** PointerBaseClass;
//initialization
PointerBaseClass = new DerivedClass * [size];
// this is code make in another class
the number of error is :error C2440:
Have you got any idea ?
the msdn help is not really clear,
I have made a lot of tries but no issue ....
Thank's for your time ...
Last edited by mini programmer; Jan 6th, 2009 at 12:13 pm.
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Join Date: Dec 2008
Posts: 41
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Light Poster
Thank's for your idea.
but If I made that , appear the same error,
but cannot convert from 'DerivedClass *' to 'BaseClass *'
// not from 'DerivedClass **' to 'BaseClass **'.
Thank's for your time ...
but If I made that , appear the same error,
but cannot convert from 'DerivedClass *' to 'BaseClass *'
// not from 'DerivedClass **' to 'BaseClass **'.
Thank's for your time ...
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Join Date: Aug 2005
Posts: 15,618
Reputation: 
Solved Threads: 1491
you need to post code so we can see exactly what you are trying to do.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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Join Date: Dec 2008
Posts: 41
Reputation:
Solved Threads: 0
Light Poster
OK..
My project has more than 10 files,
-so I attempt to put which is important.-
My project has many of tasks;
and the all it before now is correct.
I have 4 classes,
2 is derived from BaseClass , and the fourth (class4) contain :
and if I use the PointerBaseClass as array, appear the same error
=================================
the second error (( Error C2504: 'BaseClass' : base class undefined )), appear in DerivedClass1 and DerivedClass2
Thanks a lot to you for help me...
My project has more than 10 files,
-so I attempt to put which is important.-
My project has many of tasks;
and the all it before now is correct.
I have 4 classes,
2 is derived from BaseClass , and the fourth (class4) contain :
C++ Syntax (Toggle Plain Text)
and if I use the PointerBaseClass as array, appear the same error
C++ Syntax (Toggle Plain Text)
=================================
the second error (( Error C2504: 'BaseClass' : base class undefined )), appear in DerivedClass1 and DerivedClass2
C++ Syntax (Toggle Plain Text)
Thanks a lot to you for help me...
Last edited by mini programmer; Jan 6th, 2009 at 2:16 pm.
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Join Date: Dec 2008
Posts: 41
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Solved Threads: 0
Light Poster
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Are you sure DerivedClass is derived from BaseClass?
Yes;
I made the last task ( before the day) by heredity, and appear with no any errors;
but now I work in this task ( about polymorsphsim ).
and I not change any thing in derived class , but work in class4;
•
•
Join Date: Dec 2008
Posts: 41
Reputation:
Solved Threads: 0
Light Poster
Have you got any idea ?
the msdn help is not really clear,
I have made a lot of tries but no issue ....
Thank's for your time ...
the msdn help is not really clear,
I have made a lot of tries but no issue ....
Thank's for your time ...
•
•
Join Date: Aug 2005
Posts: 15,618
Reputation:
Solved Threads: 1491
>>BaseClass ** PointerBaseClass ;
Why does that have two stars? If you want an array of classes all you need is one star. Two stars indicates either an array of pointers to array of classes, or a pointer to a pointer. The code snippet you posted doesn't seem to need either of those.
Why does that have two stars? If you want an array of classes all you need is one star. Two stars indicates either an array of pointers to array of classes, or a pointer to a pointer. The code snippet you posted doesn't seem to need either of those.
BaseClass* PointerBaseClass = new DerivedClass[size]; Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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