66bdc70bf1
Move examples/*.sx and their expected/ snapshots into per-category subfolders (examples/<category>/...). Folder = leading filename token, with ffi-objc/ffi-jni kept whole; filenames are unchanged. The corpus runner and LSP sweep now discover each category's expected/ dir, while issues/ stays flat. Example 1058's repo-root-relative companion import is made file-relative. Path strings embedded in 164 snapshots were regenerated (path-only changes). Test-layout docs in CLAUDE.md updated.
40 lines
1.5 KiB
Plaintext
40 lines
1.5 KiB
Plaintext
// Feature 1 — heterogeneous protocol-constrained variadic pack (binding).
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//
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// `..xs: Show` (no `[]`, no `$`) is a pack, not a slice: each call site
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// monomorphizes with the concrete per-position arg types (Decision 1 — a pack
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// is a comptime mechanism, no runtime pack value), and `xs.len` is a comptime
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// constant. Arity and element types vary per call; each call is a distinct
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// specialization.
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//
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// DESIGN (locked): a pack element is viewed THROUGH the protocol — only the
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// protocol's own interface (its methods, and the projections `xs.T` / `xs.value`)
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// is accessible, NOT arbitrary concrete members. So `xs[i].get()` / `xs.T` are
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// the intended interface; `xs[i].v` (a field on the concrete IntBox, not part
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// of `Show`) is an error. Those are still being implemented — this example
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// locks in only the binding + comptime `xs.len`, the protocol-agnostic part.
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#import "modules/std.sx";
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Show :: protocol(T: Type) {
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get :: (self: *Self) -> T;
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}
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IntBox :: struct { v: i64; }
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StrBox :: struct { s: string; }
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impl Show(i64) for IntBox { get :: (self: *IntBox) -> i64 => self.v; }
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impl Show(string) for StrBox { get :: (self: *StrBox) -> string => self.s; }
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howmany :: (..xs: Show) -> i64 {
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return xs.len;
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}
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main :: () -> i32 {
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a := IntBox.{ v = 42 };
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b := IntBox.{ v = 7 };
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c := StrBox.{ s = "cool" };
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print("n0={}\n", howmany()); // empty pack
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print("n2={}\n", howmany(a, b)); // two elements
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print("n3={}\n", howmany(a, b, c)); // heterogeneous: IntBox, IntBox, StrBox
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0
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}
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