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Date: Tue, 02 Jun 2009 22:45:52 +0200
From: Gerd Hoffmann <kraxel@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] use qemu_malloc and friends consistently
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To: David Turner <digit@google.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Jean-Christophe Dubois <jcd@tribudubois.net>, Paul Brook <paul@codesourcery.com>, qemu-devel@nongnu.org

On 06/02/09 22:42, David Turner wrote:
>> #define QEMU_NEW(type) ((type *)qemu_malloc(sizeof(type)))
>> #define QEMU_NEW(ptr) (ptr) = qemu_malloc(sizeof(*(ptr)))
>>   foo *ptr;
>>   QEMU_NEW(ptr);
>>
>> Because the compiler will catch the type mismatch.
>>
>
> I still don't see the point.
> There is no type mismatch in the first version since the C standard mandates
> that a (void*) *must* be silently casted into any other typed pointer
> (unlike C++ which forbids this).
>
> I think you're afraid of the following case instead:
>
> foo*  ptr;
> ptr = QEMU_MEW(bar);   =>    compiler will complain that 'ptr' is not a bar*
>
> But this is not possible with the first version anyway.
>
>
>
>> Paul
>>
>