22:38 <Thunfisch> Hi there. Can anyone tell me how to compile a binary from two class files and a file with the main program? file1.ml contains class1, a virtual class which is needed by class2 in file2.ml and instantiated in main.ml. This is what I've tried:

22:38 <Thunfisch> ocamlc -w A class1.ml class2.ml main.ml

22:38 <Thunfisch> And this is what I received:

22:38 <Thunfisch> File "class2.ml", line 3, characters 10-21:Unbound class

22:38 <Thunfisch> class1

22:38 <Thunfisch> Do I need to "include" class1 in class2 by using something like #include in C/C++?

22:39 <mellum> you need a .mli file that describes the interface.

22:39 <mellum> similar to a header file.

22:40 <Thunfisch> Like ocaml -i file1.ml > file1.mli?

22:40 <Thunfisch> ocamlc.

22:40 <mellum> Yes, altough you'd usually want to trim it down since you don't want to expose everything.

22:40 <Thunfisch> Hm, right.

22:42 <Thunfisch> Are there any documents which describe how the ocaml batch compiler works? Something like a compiler-tutorial?

22:43 <Thunfisch> Or better: how to use it.

22:43 <Riastradh> http://caml.inria.fr/ocaml/htmlman

22:43 <mellum> I bet there are :)

22:43 <Thunfisch> Ay. Thank you.

23:08 <vincenz> nono

23:08 <vincenz> You need to make sure to have them in the right order

23:08 <vincenz> or compile separately

23:10 <Thunfisch> Ah. Hm. I just executed ocamlc -w A file1.ml for my virtual class. But I just can't figure out what I need to do for getting file2.ml compiled. class2 in file2.ml inherits my virtual class1 from file1.ml.

23:10 <Thunfisch> This ist kinda frustrating. I just don't get it.

23:13 <Thunfisch> Do I have to write class1's interface into the file2.ml or is there a switch for ocamlc that includes a given interface file automatically?

23:18 <mellum> You access it with File1.name. Then no further switch is needed.

23:41 <vincenz> ocamlc -c class1.ml

23:41 <vincenz> ocamlc -c class2.ml

23:41 <vincenz> ocamlc -o appname class1.cmo class2.cmo

23:44 <Thunfisch> ocamlc -c class2.ml doesn't work. I get the mentioned "Unbound class" message for missing class1. mellum said that I need class1's interface. I'm still not sure, whether I need to put the interface right into class2.ml or not. My files look like this:

23:44 <Thunfisch> class1.ml: class virtual a = object method virtual m1 : unit end;;

23:44 <Thunfisch> class2.ml: class b = object inherit a method m1 = print_string w00t end;;

23:44 <Thunfisch> So, I guess that class2.ml needs to "know" class1.ml somehow.

23:45 <Thunfisch> "w00t". Or any other String.

23:49 <vincenz> inherity Class1.a

23:49 <vincenz> inherit Class1.a

23:49 <vincenz> make sure to compile class1.ml first

23:49 <vincenz> it'll generate the .cmi or compiled ml interface file

23:50 <Thunfisch> Perfect. It works now. Thank you, guys.

23:51 <mlh> does anyone have a moment to have a look at http://cpp.sourceforge.net/?show=4117

23:51 <mlh> I dunno why i'm getting invalid_argument String_sub for the commented out line

23:51 <vincenz> maybe there is no =

23:52 <vincenz> oh

23:52 <vincenz> nono

23:52 <vincenz> the sub works like this:

23:52 <vincenz> start len

23:52 <vincenz> so....

23:52 <mlh> ah!

23:52 <vincenz> v p (lv-p)

23:53 <mlh> i thought it was start, end.

23:53 <mlh> ta

23:54 <mlh> thank you! i'm too used to c++ iterators i guess

23:54 <mlh> feel free to make any comments on my code too :-)

23:55 <vincenz> use an iter

23:55 <vincenz> not a for loop

23:59 <mlh> ok. i was going to ask what the difference was between iter and map, but it looks like the difference is that map returns an array, whereas iter does not. is this correct?