43 lines
918 B
Plaintext
43 lines
918 B
Plaintext
// Minimal: protocol dispatch on List(Protocol) items from a function
|
|
|
|
#import "modules/std.sx";
|
|
|
|
Sizable :: protocol {
|
|
size :: () -> s64;
|
|
}
|
|
|
|
Leaf :: struct { value: s64; }
|
|
impl Sizable for Leaf {
|
|
size :: (self: *Leaf) -> s64 { self.value; }
|
|
}
|
|
|
|
add :: (items: *List(Sizable), w: Leaf) {
|
|
p := w;
|
|
items.append(p);
|
|
}
|
|
|
|
dispatch_fn :: (items: *List(Sizable)) {
|
|
out("dispatch_fn: about to dispatch\n");
|
|
s := items.items[0].size();
|
|
print("dispatch_fn: result = {}\n", s);
|
|
}
|
|
|
|
main :: () -> void {
|
|
items : List(Sizable) = .{};
|
|
add(@items, Leaf.{ value = 42 });
|
|
|
|
// Direct dispatch twice
|
|
out("=== Direct 1 ===\n");
|
|
r1 := items.items[0].size();
|
|
print("r1 = {}\n", r1);
|
|
|
|
out("=== Direct 2 ===\n");
|
|
r2 := items.items[0].size();
|
|
print("r2 = {}\n", r2);
|
|
|
|
// Then from function
|
|
out("=== From function ===\n");
|
|
dispatch_fn(@items);
|
|
out("=== OK ===\n");
|
|
}
|