behavior of new

[Tino]

What is the standard behavior, if any, of the following.

int *p, n = 0;
p = new int[n];

Is p guaranteed not to be NULL, because it's not clear to me why it wouldn't be...

Regards,
Ryan

[John Harrison]

Re: behavior of new


"Tino" <tino52@yahoo.c om> wrote in message
news:f9d112e6.0 308010922.5e568 d5@posting.goog le.com...[color=blue]
> What is the standard behavior, if any, of the following.
>
> int *p, n = 0;
> p = new int[n];
>
> Is p guaranteed not to be NULL, because it's not clear to me why it[/color]
wouldn't be...[color=blue]
>
> Regards,
> Ryan[/color]

Its guaranteed not to be NULL, why should it be?

john

[Reginald P. Smithford]

Re: behavior of new

Wouldn't p==NULL if there wasn't enough memory for new to succeed? I
haven't been paying much attention to the standard recently, but I
assume this is still true. But, other than this error condition, p is
guaranteed to be a valid address (which NULL is not), and different
from any other pointers allocated with new or malloc (not just
different from other ints allocated).

Reggy

"Victor Bazarov" <v.Abazarov@att Abi.com> wrote in message news:<vil8mk4dk k8n26@corp.supe rnews.com>...[color=blue]
> "Tino" <tino52@yahoo.c om> wrote...[color=green]
> > What is the standard behavior, if any, of the following.
> >
> > int *p, n = 0;
> > p = new int[n];
> >
> > Is p guaranteed not to be NULL, because it's not clear to me why it[/color]
> wouldn't be...
>
> Yes, it is guaranteed not to be NULL, and it's guaranteed to be
> different from any other "int"'s address in the system.
>
> Victor[/color]

[Jerry Coffin]

Re: behavior of new

In article <f9d112e6.03080 10922.5e568d5@p osting.google.c om>, tino52
@yahoo.com says...[color=blue]
> What is the standard behavior, if any, of the following.
>
> int *p, n = 0;
> p = new int[n];
>
> Is p guaranteed not to be NULL, because it's not clear to me why
> it wouldn't be...[/color]

Assuming new didn't throw bad_alloc, p will be a unique, non-null
pointer, but dereferencing it will give undefined results.

--
Later,
Jerry.

The universe is a figment of its own imagination.