Callbacks or similar?

[Jonathan M Davis]

On Saturday, February 16, 2013 22:24:19 Lemonfiend wrote:
> On Saturday, 16 February 2013 at 21:03:54 UTC, Dicebot wrote:
> > http://dlang.org/expression.html#FunctionLiteral
> > 
> > Function parameters/variables are declared in D using
> > "ReturnType function(ParameterTypes) symbol". "function" is a
> > keyword here, it can be swapped for "delegate" to get, em,
> > delegates.
> > 
> > In your case something like "void function(int) callback" will
> > do.
> 
> You mean this?
> 
> void foo(int[] arr, int cmp, void function(int) callback)
> {
> 	foreach(int val; arr)
> 	{
> 		if(val == cmp)
> 			callback(val);
> 	}
> }
> 
> But how do I then pass bar to foo?
> 
> void bar(int val)
> {
> 	writeln(val);
> }
> 
> This doesn't work:
> 
> foo([0,1,2], 1, bar);

foo([0, 1, 2], 1, &bar);

should work. void function(int) is a function pointer, so you need to pass it 
a pointer to a function. bar by itself is attempting to call the function 
(which won't work due to a lack of arguments). It's discussed in the link to 
the documentation that Dicebot gave you.

- Jonathan M Davis