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.
29 lines
1019 B
Plaintext
29 lines
1019 B
Plaintext
// Phase 6 — `c.sources = .(..sources)`: materialize a pack into a
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// protocol-typed tuple field, erasing each concrete pack element to the field's
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// protocol slot. The pack `..sources: VL` holds concrete cells; `.(..sources)`
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// into a `Tuple(..VL(Ts))` field `xx`-erases each to its `VL(Ti)` value.
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#import "modules/std.sx";
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VL :: protocol(T: Type) { get :: (self: *Self) -> T; }
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IntCell :: struct { v: i64; }
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StrCell :: struct { s: string; }
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impl VL(i64) for IntCell { get :: (self: *IntCell) -> i64 => self.v; }
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impl VL(string) for StrCell { get :: (self: *StrCell) -> string => self.s; }
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Combined :: struct($R: Type, ..$Ts: []Type) {
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sources: Tuple(..VL(Ts));
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value: $R;
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}
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build :: (..sources: VL) -> void {
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c : Combined(i64, ..sources.T) = ---;
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c.sources = .(..sources); // pack → tuple, per-element erase
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print("{} {}\n", c.sources.0.get(), c.sources.1.get());
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}
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main :: () -> i32 {
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build(IntCell.{ v = 10 }, StrCell.{ s = "hi" }); // 10 hi
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0
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}
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