In 0.95, this fails to compile with the error "test.d(15): non-constant
expression new E"

int main()
{
class E : Exception { this() { super( "" ); } }
static E e = new E();
return 0;
}

I had been using this technique so I only had to construct internal exceptions once.  Is there a new method I can use to do the same thing, or is this a bug?


Sean

I'd be willing to bet that it'd work if you split the declaration from the assignment:

static E e;
e = new E;

Sucks? Yes ...


"Sean Kelly" <sean@f4.ca> wrote in message news:cdh1j6$jto$1@digitaldaemon.com...
> In 0.95, this fails to compile with the error "test.d(15): non-constant
> expression new E"
>
> int main()
> {
> class E : Exception { this() { super( "" ); } }
> static E e = new E();
> return 0;
> }
>
> I had been using this technique so I only had to construct internal
exceptions
> once.  Is there a new method I can use to do the same thing, or is this a
bug?
>
>
> Sean
>
>

In article <cdh2hh$ker$1@digitaldaemon.com>, Kris says...
>
>I'd be willing to bet that it'd work if you split the declaration from the assignment:
>
>static E e;
>e = new E;
>
>Sucks? Yes ...

You're right, that works.  How incredibly odd.  But this new syntax makes it look like e will be initialized every time the function is called, which is not what I want.  And I'd prefer not to have to put in a bunch of:

if( !e ) e = new E();

calls... perhaps this will be fixed in 0.96?


Sean

I do this kind of thing in a static constructor; but the language/compiler would ideally support a one-time assignment to something like a "static final", or whatever Walter would prefer to call it.

- Kris

"Sean Kelly" <sean@f4.ca> wrote in message news:cdh3hl$kou$1@digitaldaemon.com...
> In article <cdh2hh$ker$1@digitaldaemon.com>, Kris says...
> >
> >I'd be willing to bet that it'd work if you split the declaration from
the
> >assignment:
> >
> >static E e;
> >e = new E;
> >
> >Sucks? Yes ...
>
> You're right, that works.  How incredibly odd.  But this new syntax makes
it
> look like e will be initialized every time the function is called, which
is not
> what I want.  And I'd prefer not to have to put in a bunch of:
>
> if( !e ) e = new E();
>
> calls... perhaps this will be fixed in 0.96?
>
>
> Sean
>
>

"Sean Kelly" <sean@f4.ca> wrote in message news:cdh1j6$jto$1@digitaldaemon.com...
> In 0.95, this fails to compile with the error "test.d(15): non-constant
> expression new E"
>
> int main()
> {
> class E : Exception { this() { super( "" ); } }
> static E e = new E();
> return 0;
> }
>
> I had been using this technique so I only had to construct internal
exceptions
> once.  Is there a new method I can use to do the same thing, or is this a
bug?

D doesn't do the C++ thing of wrapping dynamic initializers for local statics in a conditional. You'll need to do it manually, as in:

    static E e;
    if (!e) e = new E();