customized "new" and pointer alignment

[%u]

== Quote from %u (new at new.com)'s article
> no answer from digitalmars.D.learn, try it here.
> == Posted at 2007/01/29 15:52 to digitalmars.D.learn
> I want to do explicit memory allocation for some of my objects,
> I'm reading:  http://digitalmars.com/d/memory.html#newdelete
> which says:
> # The pointer returned from new() must be to memory aligned to the default
> alignment. This is 8 on win32 systems.
> Then on the next section:
> http://digitalmars.com/d/memory.html#markrelease
> new(size_t sz)
>     {   void *p;
>  p = &buffer[bufindex];
>  bufindex += sz;
>  if (bufindex > buffer.length)
>      throw new OutOfMemory;
>  return p;
>     }
> Is this code correct? I mean the object size (sz) could be any integer, how
> can one ensure the alignment requirement?
> If the above code in "Mark/Release" is incorrect, can anyone tell me how to
> return aligned memory pointers?  and for lots of small objects, does alignment
> waste too much memory?
> Thanks.

Also buffer is declared as:

void[] buffer;

Is the size of void is the same as char?