On 02-Jun-10 4:03 AM, Sasha Khapyorsky wrote:
On 00:18 Wed 02 Jun , Yevgeny Kliteynik wrote:
AFAIR (anytype *) to (void *) casting is not needed (doing implicitly)
in C and this is already part of some basic standards.
True, but the problem is not (anytype *) to (void *) casting.
It's the other way around: (void *) to (anytype *) casting.
It is the same meaning. Otherwise it would be useless.
No, it's not.
Casting TO void* is not dangerous - void* is just a "place holder".
Casting FROM void* is more dangerous - it means your program would
actually be using this pointer's content.
Right now gcc allows you to do implicit casting in both ways, g++ doesn't.
Try compiling this code:
#include <stdlib.h>
int main()
{
void * v = NULL;
int * t = NULL;
v = t;
t = v;
return 0;
}
try.cc:7: error: invalid conversion from 'void*' to 'int*'
Here are more details:
http://www2.research.att.com/~bs/bs_faq2.html#void-ptr
-- Yevgeny
Sasha
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