1 files changed, 60 insertions, 0 deletions
diff --git a/vendor/writeable/examples/writeable_message.rs b/vendor/writeable/examples/writeable_message.rs
new file mode 100644
index 000000000..b342fdb26
--- /dev/null
+++ b/vendor/writeable/examples/writeable_message.rs
@@ -0,0 +1,60 @@
+// This file is part of ICU4X. For terms of use, please see the file
+// called LICENSE at the top level of the ICU4X source tree
+// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).
+
+// This example illustrates a very simple type implementing Writeable.
+icu_benchmark_macros::static_setup!();
+
+use std::fmt;
+use writeable::*;
+
+struct WriteableMessage<W: Writeable>(W);
+
+const GREETING: Part = Part {
+    category: "meaning",
+    value: "greeting",
+};
+
+const EMOJI: Part = Part {
+    category: "meaning",
+    value: "emoji",
+};
+
+impl<V: Writeable> Writeable for WriteableMessage<V> {
+    fn write_to_parts<W: PartsWrite + ?Sized>(&self, sink: &mut W) -> fmt::Result {
+        use fmt::Write;
+        sink.with_part(GREETING, |g| {
+            g.write_str("Hello")?;
+            g.write_str(" ")?;
+            self.0.write_to(g)
+        })?;
+        sink.write_char(' ')?;
+        sink.with_part(EMOJI, |e| e.write_char('😅'))
+    }
+
+    fn writeable_length_hint(&self) -> LengthHint {
+        LengthHint::exact(11) + self.0.writeable_length_hint()
+    }
+}
+
+impl<V: Writeable> fmt::Display for WriteableMessage<V> {
+    #[inline]
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        self.write_to(f)
+    }
+}
+
+fn main() {
+    icu_benchmark_macros::main_setup!();
+
+    let (string, parts) = writeable_to_parts_for_test(&WriteableMessage("world")).unwrap();
+
+    assert_eq!(string, "Hello world 😅");
+
+    // Print the greeting only
+    let (start, end, _) = parts
+        .into_iter()
+        .find(|(_, _, part)| part == &GREETING)
+        .unwrap();
+    println!("{}", &string[start..end]);
+}