1 files changed, 45 insertions, 0 deletions
diff --git a/third_party/rust/objc/examples/example.rs b/third_party/rust/objc/examples/example.rs
new file mode 100644
index 0000000000..5346b620fb
--- /dev/null
+++ b/third_party/rust/objc/examples/example.rs
@@ -0,0 +1,45 @@
+#[macro_use]
+extern crate objc;
+
+use objc::Encode;
+use objc::rc::StrongPtr;
+use objc::runtime::{Class, Object};
+
+fn main() {
+    // Get a class
+    let cls = class!(NSObject);
+    println!("NSObject size: {}", cls.instance_size());
+
+    // Inspect its ivars
+    println!("NSObject ivars:");
+    for ivar in cls.instance_variables().iter() {
+        println!("{}", ivar.name());
+    }
+
+    // Allocate an instance
+    let obj = unsafe {
+        let obj: *mut Object = msg_send![cls, alloc];
+        let obj: *mut Object = msg_send![obj, init];
+        StrongPtr::new(obj)
+    };
+    println!("NSObject address: {:p}", obj);
+
+    // Access an ivar of the object
+    let isa: *const Class = unsafe {
+        *(**obj).get_ivar("isa")
+    };
+    println!("NSObject isa: {:?}", isa);
+
+    // Inspect a method of the class
+    let hash_sel = sel!(hash);
+    let hash_method = cls.instance_method(hash_sel).unwrap();
+    let hash_return = hash_method.return_type();
+    println!("-[NSObject hash] return type: {:?}", hash_return);
+    assert!(hash_return == usize::encode());
+
+    // Invoke a method on the object
+    let hash: usize = unsafe {
+        msg_send![*obj, hash]
+    };
+    println!("NSObject hash: {}", hash);
+}