[Issue 11722] Qualifier-only casts should not invoke opCast

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11722



--- Comment #7 from monarchdodra at gmail.com 2013-12-12 23:49:57 PST ---
(In reply to comment #6)
> (In reply to comment #5)
> > (In reply to comment #0)
> > > This is a spin-off issue from bug 5747.
> > > 
> > > D has a cast syntax for modifying just only the type qualifier of the operand.
> > > 
> > > http://dlang.org/expression#CastExpression
> > > 
> > > CastExpression:
> > >     cast ( Type ) UnaryExpression
> > >     cast ( CastQual ) UnaryExpression   <--
> > >     cast ( ) UnaryExpression            <--
> > 
> > Kenji: I'm wondering: Your original post seemed to imply the enhancement was
> > *only* for qualifier cast. However, the final result seems to be for *any* kind
> > of cast, whith matching types. I mean:
> > 
> > const(S) s;
> > auto a = cast() s;
> > auto b = cast(S) s;
> > 
> > In the case of "a": We have a "CastQual" type cast, and this bypasses the
> > opCast operator entirelly.
> > In the case of "b": We have a *Type* cast, but that happens to result only in a
> > qualifier change.
> > 
> > In the case of "b", *should* we call opCast? Please clarify.
> 
> Yes.
> And actually, with git-head, following code asserts only in the case of "b".

Ah. Oops. I was testing the wrong code. Thanks.

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