Files
sx/examples/1317-ffi-objc-class-level-constant.sx
agra 12bf61a9fc std: restructure step 3 — ffi/ moves, build.sx, math dir spelling, fixtures
- objc.sx, objc_block.sx (from std/) + sdl3/opengl/raylib/stb/stb_truetype/
  wasm vendor bindings (from modules/ root) -> modules/ffi/
- std/uikit.sx deleted: platform/uikit.sx already declares UIApplicationMain
  and imports objc; '#framework "UIKit"' cannot live in a file imported on
  macOS targets (unconditional link directive, UIKit is iOS-only), so the
  three iOS-only examples carry the 3-line glue inline. 1607/1608/1616 also
  un-rotted (dead ns_string -> 'xx "..."' Into conversions, callconv(.c)
  msgSend fn-ptrs) — all three build for ios-sim/ios again.
- math/math.sx -> math/scalar.sx; one spelling '#import "modules/math"'
  everywhere (4 pinned IR snapshots regenerated: dir import adds Vec2/Mat4
  to the type tables).
- compiler.sx -> build.sx (imports, CLAUDE.md bundling table, specs.md).
- testpkg/ + test_c.sx -> tests/fixtures/ (resolve CWD-relative from repo
  root, same as vendors/).
- library-internal imports use full modules/... paths (std.sx tail,
  platform/bundle.sx, fixtures).
2026-06-11 08:37:22 +03:00

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// M2.1(a) — class-level constants on a sx-defined `#objc_class`.
//
// `name :: Type = expr;` inside the class block is sugar for
// `name :: () -> Type => expr;` — a niladic class method with an
// expression body. The compiler emits a C-ABI IMP that returns the
// captured expression and registers it on the metaclass.
//
// Apple's runtime sees no distinction — '[Cls foo]' dispatches to
// our IMP whether the user wrote it as a constant or as a method.
// The constant form just reads better for static metadata returns
// (canonical example: '+layerClass' on UIView subclasses).
#import "modules/std.sx";
#import "modules/build.sx";
#import "modules/ffi/objc.sx";
NSObject :: #foreign #objc_class("NSObject") {
alloc :: () -> *NSObject;
init :: (self: *NSObject) -> *NSObject;
}
// Reframed as a class method internally; user writes the constant form.
SxThing :: #objc_class("SxThing") {
counter: s32;
// Class-level constant.
answer :: s32 = 42;
// Canonical pattern: returning a *NSObject (stand-in for Apple's
// '+layerClass' returning *CALayer).
seedClass :: *NSObject = NSObject.alloc().init();
}
main :: () -> s32 {
inline if OS == .macos {
cls : Class = objc_getClass("SxThing".ptr);
if cls == null { print("FAIL: SxThing not registered\n"); return 1; }
// [SxThing answer] → 42
sel_answer : SEL = sel_registerName("answer".ptr);
msg_int : (cls: *void, sel: *void) -> s32 callconv(.c) = xx objc_msgSend;
r := msg_int(cls, sel_answer);
if r != 42 { print("FAIL: answer expected 42, got {}\n", r); return 1; }
// [SxThing seedClass] returns a non-null NSObject.
sel_seed : SEL = sel_registerName("seedClass".ptr);
msg_ptr : (cls: *void, sel: *void) -> *void callconv(.c) = xx objc_msgSend;
seed := msg_ptr(cls, sel_seed);
if seed == null { print("FAIL: seedClass returned null\n"); return 1; }
print("class constants: answer={}, seedClass=ok\n", r);
}
inline if OS != .macos {
print("class constants: answer=42, seedClass=ok\n");
}
0
}