skaller wrote:
> [EMAIL PROTECTED]:/work/felix/svn/felix/felix/trunk$ f er3
> 5
> (1, (2, (3, (4, ()))))
>
> Try svn update?
That one worked as well! Now for the grand finale, using a typeclass
without opening the module:
#import <flx.flxh>
open List;
typeclass Str[T] {
virtual fun str2: T->string;
}
module Foo {
instance Str[int] {
fun str2 (x:int):string => str x;
}
fun foo[T with Str[T]] (x:T):string => str2 x;
fun foo[T with Str[T]] (x:list[T]):string =>
match x with
| Empty[T] => "()"
| Cons(?h, ?t) => "(" + (str2 h) + ", " + (foo t) + ")"
endmatch
;
}
print$ Foo::foo 5; endl;
print$ Foo::foo$ list(1,2,3,4); endl;
Prints:
CLIENT ERROR
[lookup_name_in_env]: Name '_inst_Str' not found in environment (depth 2)
In foo.flx: line 14, cols 18 to 24
13:
14: fun foo[T with Str[T]] (x:T):string => str2 x;
*******
15:
Once we have this working, we can start using type classes in the stdlib :)
-e
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