8f03349279
Locks the struct widening (aaac019): programmatic Vec2 build via
.struct(.{fields}) and a source-struct round-trip via type_info.
28 lines
1.0 KiB
Plaintext
28 lines
1.0 KiB
Plaintext
// Comptime STRUCT metaprogramming — `define` constructs a struct (not just an
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// enum), and `type_info` reflects one. Two paths:
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// 1. Programmatic build: `define(declare("Vec2"), .struct(.{ fields = … }))`
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// mints a nominal struct from a `[]StructField` value.
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// 2. Round-trip: `define(declare("RowCopy"), type_info(Row))` reflects a source
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// struct INTO a `.struct(StructInfo)` value and reconstructs an identical
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// one — no literal field list.
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// Both constructed structs build + read like any hand-written struct.
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#import "modules/std.sx";
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#import "modules/std/meta.sx";
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Vec2 :: define(declare("Vec2"), .struct(.{ fields = .[
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StructField.{ name = "x", type = f64 },
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StructField.{ name = "y", type = f64 },
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] }));
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Row :: struct { id: i64; score: f64; }
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RowCopy :: define(declare("RowCopy"), type_info(Row));
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main :: () -> i32 {
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v := Vec2.{ x = 1.5, y = -2.0 };
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print("v = {} {}\n", v.x, v.y);
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r := RowCopy.{ id = 42, score = 9.5 };
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print("r = {} {}\n", r.id, r.score);
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return 0;
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}
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