[lug] new operator in C++

[LittleViggy at alum.manhattan.edu]

I just tuned into this message, so if this has been answered before, I 
apologize.

You are guarenteed NOTHING in C++ as far as memory is concerned.  There are no 
standards that say memory is to be initialized when allocated, and cleared when 
freed.

If this is something you'd like, you can certainly overload the "new" operator 
to call the base level operator, then fill in the chunk of memory with 0's (or 
whatever).

On another note, some compilers will do exactly this, in debug mode only.  For 
example, Microsoft's Visual C++ fills in "new'd" memory with 0xcccccccc; and 
fills in deleted memory with 0xdddddddd; but **ONLY** in debug mode.  This way, 
you can easily see if you are accessing memory after it has been deleted.

Viggy

Peter Hutnick wrote:
> 
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> On Saturday 27 April 2002 01:57 pm, Stephen Queen wrote:
> > In using the new operator in C++ I cannot find whether it is guaranteed
> > to initialize the new memory to zero or not. In playing with it, it
> > looks like it does, but that might be coincidence. Does anyone know a
> > source of information on the net regarding this? Another question
> > regarding sources of information on C++. man has section 3 which is a
> > good source of information for regular C. Does anyone know of anything
> > like that for C++? It sure would come in handy now and
then.

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