mike clemow wrote:
Hey folks,
Anyone else really wish that Chuck supported higher order functions???
check it out. This doesn't work, but i'd love for it to work:
// a function that returns an int fun int fn( int n ) { return n + 3; }
// a function that takes a function and an array of ints // and returns an array of ints which correspond to the action // of that function on each int in the original array fun int[] mapInt( function fn, int list[] ) { int results[list.cap()]; for( 0 => int i; i < list.cap(); i++ ) { fn( list[i] ) => results[i]; } return results; }
[1, 2, 3, 4, 5] @=> input;
Add3 add3;
mapInt( add3, input ) => int output[];
<<< output[2] >>>; // should print 6
--
I just wish that functions could take other functions as parameters and return functions as their return value. I think that would make sense. Functions, I find are more powerful than classes in Chuck.
Also, why is "function" a keyword?
cheers, mike
Hello Mike, You can do this with functors, small classes that are functions. There is a thread on the forum with some example code, but it is basically just class Function { fun int doIt(int n) { ... } } fun void int[] mapInt(Function f, int list[]) { ... } michael