A while ago, when we had a typeclass inheritance like this:
typeclass Foo[s] { virtual proc foo: s; }
typeclass Bar[s] { virtual proc bar: s; }
typeclass FooBar[s] {
inherit Foo[s];
inherit Bar[s];
}
we had to declare the instances like this:
instance Foo[int] {
proc foo (x:int) { println$ "foo: " + (str x); }
}
instance Bar[int] {
proc bar (x:int) { println$ "bar: " + (str x); }
}
instance FooBar[int] {}
in order to do:
open FooBar[int];
However, now it looks like you don't need the extra "instance FooBar[int] {}":
///////////////////////////////
typeclass Foo[s] { virtual proc foo: s; }
typeclass Bar[s] { virtual proc bar: s; }
typeclass FooBar[s] {
inherit Foo[s];
inherit Bar[s];
}
instance Foo[int] {
proc foo (x:int) { println$ "foo: " + (str x); }
}
instance Bar[int] {
proc bar (x:int) { println$ "bar: " + (str x); }
}
open FooBar[int];
foo 5;
bar 6;
///////////////////////////////
Prints out:
foo: 5
bar: 6
So, the question is, is this just a coincidence that it's working now,
or is this really not needed any more?
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