1 files changed, 57 insertions, 0 deletions
diff --git a/third_party/rust/winreg/examples/map_key_serialization.rs b/third_party/rust/winreg/examples/map_key_serialization.rs
new file mode 100644
index 0000000000..c0be704913
--- /dev/null
+++ b/third_party/rust/winreg/examples/map_key_serialization.rs
@@ -0,0 +1,57 @@
+// Copyright 2020, Igor Shaula
+// Licensed under the MIT License <LICENSE or
+// http://opensource.org/licenses/MIT>. This file
+// may not be copied, modified, or distributed
+// except according to those terms.
+#[macro_use]
+extern crate serde_derive;
+extern crate winreg;
+use std::collections::HashMap;
+use std::error::Error;
+use winreg::enums::*;
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+struct Coords {
+    x: u32,
+    y: u32,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+struct Size {
+    w: u32,
+    h: u32,
+}
+
+#[derive(Debug, Serialize, Deserialize, PartialEq)]
+struct Rectangle {
+    coords: Coords,
+    size: Size,
+}
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let hkcu = winreg::RegKey::predef(HKEY_CURRENT_USER);
+    let (key, _disp) = hkcu.create_subkey("Software\\RustEncodeMapKey")?;
+    let mut v1 = HashMap::new();
+    v1.insert(
+        "first".to_owned(),
+        Rectangle {
+            coords: Coords { x: 55, y: 77 },
+            size: Size { w: 500, h: 300 },
+        },
+    );
+    v1.insert(
+        "second".to_owned(),
+        Rectangle {
+            coords: Coords { x: 11, y: 22 },
+            size: Size { w: 1000, h: 600 },
+        },
+    );
+
+    key.encode(&v1)?;
+
+    let v2: HashMap<String, Rectangle> = key.decode()?;
+    println!("Decoded {:?}", v2);
+
+    println!("Equal to encoded: {:?}", v1 == v2);
+    Ok(())
+}