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).
40 lines
1.2 KiB
Plaintext
40 lines
1.2 KiB
Plaintext
// Range-based for loops: `for start..end (i) { }` (cursor optional, `end`
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// exclusive) is a runtime counting loop; `inline for start..end (i) { }`
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// is comptime-unrolled — the cursor is a compile-time constant each
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// iteration, so `xs[i]` over a heterogeneous pack substitutes the concrete
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// per-position element (this is what drives pack iteration).
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#import "modules/std.sx";
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Show :: protocol {
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show :: (self: *Self) -> string;
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}
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A :: struct { x: i64; }
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B :: struct { s: string; }
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impl Show for A { show :: (self: *A) -> string => "A"; }
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impl Show for B { show :: (self: *B) -> string => "B"; }
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// Comptime-unrolled iteration over a pack; cursor `i` indexes the pack.
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each :: (..xs: Show) -> void {
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inline for 0..xs.len (i) {
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print("[{}]={}\n", i, xs[i].show());
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}
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}
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main :: () -> i32 {
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// Runtime range, cursor used.
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for 0..3 (i) { print("i={}\n", i); }
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// Runtime range, no cursor — body runs `end - start` times.
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n := 0;
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for 0..5 { n = n + 1; }
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print("n={}\n", n);
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// Non-zero start.
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for 2..5 (j) { print("j={}\n", j); }
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// Inline unroll over a heterogeneous pack.
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each(A.{ x = 1 }, B.{ s = "hi" }, A.{ x = 3 });
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0
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}
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