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Hello,

I am trying to redirect the standard malloc and calloc defined in
stdlib.h to myown implementation MyMalloc amd MyCalloc. Following is
my impementation:

\\MyMemory.c
#include MyMemory.h /*implementation of MyMalloc() and MyCalloc()*/
#define malloc MyMalloc

But when i compile my code in VisualStudios I get following error:
...\VC\include\stdlib.h(601) : error C2375: 'MyMalloc' : redefinition;
different linkage
...\MyMemory.h(41) : see declaration of 'MyMalloc'

Please help me know how do I redirect the standard calls ?

omnia neo <> writes:

> Hello,
>
> I am trying to redirect the standard malloc and calloc defined in
> stdlib.h to myown implementation MyMalloc amd MyCalloc. Following is
> my impementation:
>
> \\MyMemory.c
> #include MyMemory.h /*implementation of MyMalloc() and MyCalloc()*/
> #define malloc MyMalloc
>
> But when i compile my code in VisualStudios I get following error:
> ..\VC\include\stdlib.h(601) : error C2375: 'MyMalloc' : redefinition;
> different linkage
> ..\MyMemory.h(41) : see declaration of 'MyMalloc'

Well, can we? "See declaration of 'MyMalloc'," that is?

> Please help me know how do I redirect the standard calls ?

Regards

Paul Bibbings

On 04/24/10 01:34 AM, omnia neo wrote:
> Hello,
>
> I am trying to redirect the standard malloc and calloc defined in
> stdlib.h to myown implementation MyMalloc amd MyCalloc. Following is
> my impementation:
>
> \\MyMemory.c
> #include MyMemory.h /*implementation of MyMalloc() and MyCalloc()*/
> #define malloc MyMalloc
>
> But when i compile my code in VisualStudios I get following error:
> ..\VC\include\stdlib.h(601) : error C2375: 'MyMalloc' : redefinition;
> different linkage
> ..\MyMemory.h(41) : see declaration of 'MyMalloc'
>
> Please help me know how do I redirect the standard calls ?

By heeding the compiler's error message and using the appropriate
linkage. Without seeing your declaration, my best guess is your
function is a C++ function, whereas malloc had extern "C" linkage.
Saying that, the error isn't very helpful.

--
Ian Collins

* omnia neo:
> Hello,
>
> I am trying to redirect the standard malloc and calloc defined in
> stdlib.h to myown implementation MyMalloc amd MyCalloc. Following is
> my impementation:
>
> \\MyMemory.c
> #include MyMemory.h /*implementation of MyMalloc() and MyCalloc()*/
> #define malloc MyMalloc
>
> But when i compile my code in VisualStudios I get following error:
> ..\VC\include\stdlib.h(601) : error C2375: 'MyMalloc' : redefinition;
> different linkage
> ..\MyMemory.h(41) : see declaration of 'MyMalloc'
>
> Please help me know how do I redirect the standard calls ?

In C++ 'malloc' is seldom used directly.

It *may* be used indirectly by C++ allocation, but that's an implementation detail.

To redirect C++ allocation you overload or define the allocation and
deallocation functions, 'operator new', 'operator new[]', 'operator delete' and
'operator delete[]'.

You can overload the global ones, and/or define/overload per class.

Make sure that you never return nullpointers but instead throw std::bad_alloc.


Cheers & hth.,

- Alf