Files
sx/examples/0403-protocols-protocol-dispatch-via-fn-arg.sx
agra d8076b9333 lang: rename signed integer types sN -> iN
Surface rename of the signed integer family: s1..s64 become i1..i64
(u1..u64, usize, isize unchanged). 'string' keeps the s-prefix arm in
name classification; width parsing moves to the i-prefix arm next to
isize.

Internal TypeId tags follow the surface (.s8/.s16/.s32/.s64 ->
.i8/.i16/.i32/.i64), as do mono-key mangle fragments (ptr_i64,
tu_i64_bool) and all display/diagnostic formatting (i{d}).

Migrated in the same sweep: stdlib + examples + issue repros + FFI C
companions (shared symbol names like ffi_id_i64), expected
stdout/stderr/ir snapshots, specs.md, readme.md, CLAUDE.md/AGENTS.md,
implementation_plan.md, docs/, issue writeups. Vendored stb_image and
historical flow state left untouched.

zig build test: 426/426; examples suite: 595/595.
2026-06-12 09:31:53 +03:00

45 lines
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// Protocol dispatch on `List(Protocol)` items where the list pointer is
// passed into another function — verifies the boxed payload survives an
// extra call frame between erasure and dispatch.
#import "modules/std.sx";
Sizable :: protocol {
size :: () -> i64;
}
Leaf :: struct { value: i64; }
impl Sizable for Leaf {
size :: (self: *Leaf) -> i64 { 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");
}