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.
63 lines
2.1 KiB
Plaintext
63 lines
2.1 KiB
Plaintext
// Variadic heterogeneous type packs — step 3: type-reflection
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// intrinsics.
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//
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// Three comptime helpers used by pack-fn bodies to branch on
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// type identity / protocol membership:
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//
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// type_name(T) -> string // display name of T
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// type_eq(T1, T2) -> bool // structural TypeId equality
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// has_impl(P, T) -> bool // T has a reachable impl for P
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//
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// All three fold to compile-time constants and are accepted by
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// `tryConstBoolCondition`, so `inline if type_eq(...)` /
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// `inline if has_impl(...)` collapse to a single branch at lower
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// time — no runtime cost.
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//
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// `has_impl`'s protocol arg accepts both shapes:
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// - plain protocol name: `has_impl(Allocator, CAllocator)`.
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// - parameterised call: `has_impl(Wrap(i64), i32)` — the args
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// match the impl's protocol type-args exactly.
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#import "modules/std.sx";
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#import "modules/std/mem.sx";
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// User-defined parameterised protocol + an impl, so has_impl can
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// confirm parameterised matching works with a known-true case.
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Wrap :: protocol(Target: Type) {
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wrap :: (self: *Self) -> Target;
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}
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impl Wrap(i64) for i32 {
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wrap :: (self: i32) -> i64 => xx self;
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}
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main :: () -> i32 {
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// type_name — display names.
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print("{} {} {}\n", type_name(i64), type_name(string), type_name(bool));
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// type_eq — structural equality on TypeIds.
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print("{} {} {} {}\n",
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type_eq(i64, i64),
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type_eq(i64, string),
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type_eq(*i64, *i64),
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type_eq(*i64, *i32));
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// inline-if folds type_eq at lower time.
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inline if type_eq(i64, i64) {
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print("inline-if folded: same\n");
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} else {
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print("inline-if folded: different\n");
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}
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// has_impl — plain protocol (Allocator is unary).
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print("Allocator/CAllocator: {}\n", has_impl(Allocator, CAllocator));
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print("Allocator/i64: {}\n", has_impl(Allocator, i64));
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// has_impl — parameterised protocol (Wrap takes a Target type arg).
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print("Wrap(i64)/i32: {}\n", has_impl(Wrap(i64), i32));
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print("Wrap(i64)/bool: {}\n", has_impl(Wrap(i64), bool));
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print("Wrap(bool)/i32: {}\n", has_impl(Wrap(bool), i32));
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return 0;
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}
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