Merging upstream version 1.67.1+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 52 insertions, 0 deletions

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+# writeable [![crates.io](https://img.shields.io/crates/v/writeable)](https://crates.io/crates/writeable)
+
+`writeable` is a utility crate of the [`ICU4X`] project.
+
+It includes [`Writeable`], a core trait representing an object that can be written to a
+sink implementing `std::fmt::Write`. It is an alternative to `std::fmt::Display` with the
+addition of a function indicating the number of bytes to be written.
+
+`Writeable` improves upon `std::fmt::Display` in two ways:
+
+1. More efficient, since the sink can pre-allocate bytes.
+2. Smaller code, since the format machinery can be short-circuited.
+
+## Examples
+
+```rust
+use std::fmt;
+use writeable::assert_writeable_eq;
+use writeable::LengthHint;
+use writeable::Writeable;
+
+struct WelcomeMessage<'s> {
+    pub name: &'s str,
+}
+
+impl<'s> Writeable for WelcomeMessage<'s> {
+    fn write_to<W: fmt::Write + ?Sized>(&self, sink: &mut W) -> fmt::Result {
+        sink.write_str("Hello, ")?;
+        sink.write_str(self.name)?;
+        sink.write_char('!')?;
+        Ok(())
+    }
+
+    fn writeable_length_hint(&self) -> LengthHint {
+        // "Hello, " + '!' + length of name
+        LengthHint::exact(8 + self.name.len())
+    }
+}
+
+let message = WelcomeMessage { name: "Alice" };
+assert_writeable_eq!(&message, "Hello, Alice!");
+
+// Types implementing `Writeable` are recommended to also implement `fmt::Display`.
+// This can be simply done by redirecting to the `Writeable` implementation:
+writeable::impl_display_with_writeable!(WelcomeMessage<'_>);
+```
+
+[`ICU4X`]: ../icu/index.html
+
+## More Information
+
+For more information on development, authorship, contributing etc. please visit [`ICU4X home page`](https://github.com/unicode-org/icu4x).