6627f7348b
REIFY Phase 3.0. Add examples/0617 using RecvResult(i64) / TryResult(i64)
(construct + match, plus payload-less .closed / .empty). Seed an empty
expected/*.exit marker. RED by design — the type-fns aren't defined yet
("unresolved RecvResult"); Phase 3.1 adds them to meta.sx as type-fns
over reify and turns this green.
38 lines
1.3 KiB
Plaintext
38 lines
1.3 KiB
Plaintext
// REIFY Phase 3: RecvResult($T) / TryResult($T) — the channel result types,
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// built ENTIRELY in sx library code as type-fns over `reify` (no new compiler
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// machinery beyond Phases 0–1). A blocking recv yields a value or a `closed`
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// marker; a non-blocking try-recv adds `empty` — three states a bool can't
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// express. This locks that they construct and match like any enum, and that
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// `RecvResult(i64)` is one nominal type across sites (the type-fn identity path).
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#import "modules/std.sx";
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#import "modules/std/meta.sx";
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main :: () -> i32 {
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r := RecvResult(i64).value(42);
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if r == {
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case .value: (v) { print("recv value {}\n", v); }
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case .closed: { print("recv closed\n"); }
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}
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rc : RecvResult(i64) = .closed;
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if rc == {
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case .value: (v) { print("recv value {}\n", v); }
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case .closed: { print("recv closed\n"); }
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}
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t := TryResult(i64).value(7);
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if t == {
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case .value: (v) { print("try value {}\n", v); }
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case .empty: { print("try empty\n"); }
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case .closed: { print("try closed\n"); }
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}
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te : TryResult(i64) = .empty;
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if te == {
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case .value: (v) { print("try value {}\n", v); }
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case .empty: { print("try empty\n"); }
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case .closed: { print("try closed\n"); }
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}
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return 0;
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}
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