Delegates

[Frits van Bommel]

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 :).