6b0ebdd92b
Protocol method declarations now declare their receiver explicitly as the first parameter — 'self: *Self' (or 'self: Self') — matching the impl method signature, instead of the old implicit-receiver form where the listed params were only the extra args. That asymmetry repeatedly caused confusion over whether the first param was the receiver or an argument. The parser validates the first param is 'self' typed Self/*Self, then strips it, so all downstream lowering and the dispatch ABI are unchanged (impl blocks and call sites are unaffected). A protocol method missing the receiver is now a parse error. Migrated all 129 protocol method signatures across library + examples (+ one inline-sx test in sema.zig) to the explicit form. Updated specs.md + readme.md. New: examples/0418-protocols-explicit-receiver.sx (feature), examples/1190-diagnostics-protocol-missing-receiver.sx (negative/diagnostic).
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 :: (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: (..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 :: () -> i32 {
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// Combined(i64, i64, string): R=i64, Ts=[i64, string],
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// sources: (VL(i64), VL(string)).
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c : Combined(i64, i64, 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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