40b5fb5f7e
Rewrite specs.md tuple/failable/pack/UFCS/grammar sections to the new syntax, update readme.md, and refresh stale tuple references in example header comments. Also fixes two pre-existing doc inaccuracies surfaced in review: drop the value-discarding `;` in the tuple-return examples, and correct the §13 function-type grammar production (optional param list + optional trailing `!` channel). Optional semantics unchanged. current/CHECKPOINT-LANG.md logs the cutover.
26 lines
952 B
Plaintext
26 lines
952 B
Plaintext
// Feature 1 — materialize a tuple from a pack via `.(..xs.method)` (Decision 2:
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// a pack is stored by materializing a tuple). `.(..xs.get)` projects `get` over
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// the pack and collects the results into a real tuple value, which can then be
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// stored, indexed, and (for `Box(T)`) is heterogeneous per position.
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#import "modules/std.sx";
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Box :: protocol(T: Type) {
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get :: (self: *Self) -> T;
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}
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IntCell :: struct { v: i64; }
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StrCell :: struct { s: string; }
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impl Box(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
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impl Box(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
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snapshot :: (..xs: Box) -> void {
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t := .(..xs.get); // tuple (i64, string) materialized from the pack
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print("0={} 1={}\n", t.0, t.1);
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}
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main :: () -> i32 {
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snapshot(IntCell.{ v = 42 }, StrCell.{ s = "hi" });
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snapshot(StrCell.{ s = "x" }, IntCell.{ v = 7 }); // order swapped → (string, i64)
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0
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}
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