Delegates

[Robin Allen]

Frits van Bommel Wrote:

> Robin Allen wrote:
> > I'm trying to figure out delegates. From what I can see, they're intended to be what other languages call closures?
> > 
> > So, say I wanted to write some functions for signal processing. I'd define a Wave type as a function of time, like this:
> > 
> > alias float delegate(float) Wave;
> > 
> > and a function to return a sine wave of a specified frequency like this:
> > 
> > Wave sine(float freq)
> > {
> >   return delegate(float t) { return std.math.sin(2*std.math.PI*t); };
> > }
> [Snipped some similar examples]
> 
> Returning delegate literals is never a good idea.
> A recent thread "Trouble with anon delegates." should explain the issue. 
> I suggest you read it :).

Thanks, that cleared things up a bit. From what was said in that thread, it looks like what I'm trying to do isn't possible. Making it so that you *can* return delegate literals would be a good move IMO, but I've no idea how plausible that is (though I do know Lua and ECMAscript let you do it).