Jarrett Billingsley wrote:
On Wed, Sep 2, 2009 at 9:45 AM, Andrei
Alexandrescu<[email protected]> wrote:
Jarrett Billingsley wrote:
Well repeat should probably always take a delegate since most likely,
you're going to be passing it a lambda. However I agree that it would
be very, very nice to be able to make APIs take just delegates and
allow functions to be implicitly cast to them. You can already make
your own thunks, but they're not going to be as efficient as something
that actually works on an ABI level.
Did someone file a bug report on this?
Surprisingly, it doesn't seem like it. Walter himself, in the spec,
said that "Function pointers and delegates may merge into a common
syntax and be interchangeable with each other," so I just assume that
no one has found it necessary to make a report. Maybe there should be.
I suggested this a long time back on this NG, and I am sure many others
have also. A function pointer should essentially be a delegate whose
object is null. That is essentially the way delegates are in .Net. In
C++, boost::Function can encompass any C++ callable type so there is
little theoretical reason why D should not encompass all callable types
into a delegate. Having to program for any callable type, in a
functional callable or signal/slots library, by dealing with the two
signature variations of a function pointer and a delegate rather than a
single common signature is a real PITA in an advanced programming language.
