Callbacks or similar?

[Lemonfiend]

On Saturday, 16 February 2013 at 21:31:05 UTC, Jonathan M Davis 
wrote:
> 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

Ah you're right, it does, thanks.
I find the D documentation to generally be very hard to read :(