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.
24 lines
961 B
Plaintext
24 lines
961 B
Plaintext
// Comptime TUPLE metaprogramming — `define` constructs a tuple and `type_info`
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// reflects one, completing the reflect/construct triad (enum 0619, struct 0622,
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// tuple here). Tuples are POSITIONAL, so `TupleInfo` is just a `[]Type` (no field
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// names). Two paths:
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// 1. Programmatic build: `define(declare("Pair"), .tuple(.{ elements = … }))`.
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// 2. Round-trip: `define(declare("TripleCopy"), type_info(Tuple(i64, bool, f64)))`
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// reflects a source tuple type INTO a `.tuple(TupleInfo)` value and
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// reconstructs it — no literal element list.
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#import "modules/std.sx";
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#import "modules/std/meta.sx";
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Pair :: define(declare("Pair"), .tuple(.{ elements = .[ i64, f64 ] }));
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TripleCopy :: define(declare("TripleCopy"), type_info(Tuple(i64, bool, f64)));
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main :: () -> i32 {
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p : Pair = .{ 3, 2.5 };
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print("p = {} {}\n", p.0, p.1);
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t : TripleCopy = .{ 7, true, 1.5 };
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print("t = {} {} {}\n", t.0, t.1, t.2);
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return 0;
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}
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