Vendor things

third-party/vendor/objc2-encode/examples/ns_string.rs

@@ -0,0 +1,25 @@
+use objc2_encode::{Encode, Encoding, RefEncode};
+
+/// We don't know the size of NSString, so we can only hold pointers to it.
+///
+/// TODO: Use [`extern type`][rfc-1861] when that gets stabilized.
+///
+/// [rfc-1861]: https://rust-lang.github.io/rfcs/1861-extern-types.html
+#[repr(C)]
+struct NSString {
+    _priv: [u8; 0],
+}
+
+/// Implement `RefEncode` for pointers and references to the string.
+unsafe impl RefEncode for NSString {
+    const ENCODING_REF: Encoding = Encoding::Object;
+}
+
+fn main() {
+    println!("{}", <*const NSString>::ENCODING);
+    println!("{}", <*mut NSString>::ENCODING);
+    println!("{}", <&NSString>::ENCODING);
+    println!("{}", <&mut NSString>::ENCODING);
+    println!("{}", Option::<&NSString>::ENCODING);
+    println!("{}", Option::<&mut NSString>::ENCODING);
+}