Vendor things

third-party/vendor/objc2/examples/basic_usage.rs

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+use objc2::foundation::{NSArray, NSDictionary, NSObject};
+use objc2::ns_string;
+use objc2::rc::autoreleasepool;
+
+fn main() {
+    // Create and compare NSObjects
+    let obj = NSObject::new();
+    #[allow(clippy::eq_op)]
+    {
+        println!("{:?} == {:?}? {:?}", obj, obj, obj == obj);
+    }
+
+    let obj2 = NSObject::new();
+    println!("{:?} == {:?}? {:?}", obj, obj2, obj == obj2);
+
+    // Create an NSArray from a Vec
+    let objs = vec![obj, obj2];
+    let array = NSArray::from_vec(objs);
+    for obj in array.iter() {
+        println!("{:?}", obj);
+    }
+    println!("{}", array.len());
+
+    // Turn the NSArray back into a Vec
+    let mut objs = NSArray::into_vec(array);
+    let obj = objs.pop().unwrap();
+
+    // Create a static NSString
+    let string = ns_string!("Hello, world!");
+    // Use an autoreleasepool to get the `str` contents of the NSString
+    autoreleasepool(|pool| {
+        println!("{}", string.as_str(pool));
+    });
+    // Or simply use the `Display` implementation
+    let _s = string.to_string(); // Using ToString
+    println!("{}", string); // Or Display directly
+
+    // Create a dictionary mapping strings to objects
+    let keys = &[string];
+    let vals = vec![obj];
+    let dict = NSDictionary::from_keys_and_objects(keys, vals);
+    println!("{:?}", dict.get(string));
+    println!("{}", dict.len());
+}