a922814ba3
packTypeElems now handles a parameterized spread operand F(Ts): for each pack element T_i it temporarily binds the pack name to T_i and resolves F(T_i), yielding (VL(T0), VL(T1), ...). Combined with parameterized-protocol value types, the canonical Combined struct field sources: (..VL(Ts)) now resolves to a tuple of real protocol values. End-to-end (examples/207): instantiate Combined(s64, s64, string), whole-store c.sources = (xx IntCell, xx StrCell), and per-element dispatch c.sources.0.get() / c.sources.1.get() all work. 242 examples + unit green.
30 lines
1.2 KiB
Plaintext
30 lines
1.2 KiB
Plaintext
// Phase 4.2 — the canonical `Combined` struct's storage layer: a generic
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// struct whose field is a pack of PARAMETERIZED-protocol values,
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// `sources: (..VL(Ts))` → `(VL(T0), VL(T1), …)`. Each `VL(Ti)` is a real
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// 16-byte protocol value (issue: parameterized-protocol value types), and
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// `(..VL(Ts))` applies `VL` per pack element. Instantiate + whole-tuple store
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// of `xx`-erased values + per-element method dispatch all work.
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#import "modules/std.sx";
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VL :: protocol(T: Type) { get :: () -> T; }
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IntCell :: struct { v: s64; }
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StrCell :: struct { s: string; }
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impl VL(s64) for IntCell { get :: (self: *IntCell) -> s64 => 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: (..VL(Ts)); // (VL(T0), VL(T1), …) — tuple of protocol values
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value: $R;
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}
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main :: () -> s32 {
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// Combined(s64, s64, string): R=s64, Ts=[s64, string],
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// sources: (VL(s64), VL(string)).
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c : Combined(s64, s64, string) = ---;
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c.sources = (xx IntCell.{ v = 10 }, xx StrCell.{ s = "hi" });
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c.value = 99;
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print("{} {} {}\n", c.sources.0.get(), c.sources.1.get(), c.value); // 10 hi 99
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0;
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}
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