HibernateD and DDBC - ORM and DB abstraction layer for D

[Nick Sabalausky]

On Wed, 22 May 2013 02:10:52 +0200
"Diggory" <diggsey at googlemail.com> wrote:

> On Tuesday, 21 May 2013 at 22:24:06 UTC, Nick Sabalausky wrote:
> > On Mon, 06 May 2013 11:14:56 +0200
> > "Kagamin" <spam at here.lot> wrote:
> >
> >> On Monday, 29 April 2013 at 09:38:10 UTC, David wrote:
> >> > Null blows up your code, "" doesn't.
> >> 
> >> There's no difference between null and empty string in D.
> >> 
> >
> > That's not true:
> >
> >     assert("" !is null); // Passes
> >
> > Or did I misunderstand what you meant?
> 
> Strings are slices which are a pointer and a length. I think a 
> slice compares equal to null only if the pointer part is null. 
> However, a slice with a null pointer and a length of zero is 
> still a valid empty slice, which is slightly odd behaviour 
> compared to other languages...
> 
> An empty string literal initialises the pointer to non-null 
> because string literals are null terminated, so the memory block 
> actually has a length of one, even though the slice has length 
> zero.

Right, exactly. In other words, there *is* a difference between null and
empty string in D (even though it's sometimes a clouded issue since
'==' counts them as equal).