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// This library is released under the same terms as Rust itself.
//! Leaky cows: convert a clone-on-write reference into a plain reference. If it's just the
//! plain reference, just return that. If it's the owned structure, leak it and return a
//! reference to it.
extern crate leak;
use leak::Leak;
use std::borrow::{Borrow, Cow, ToOwned};
pub trait LeakyCow<'a, B: ?Sized> {
fn leak(self) -> &'a B;
}
impl<'a, B: ?Sized> LeakyCow<'a, B> for Cow<'a, B> where B: 'a + ToOwned, B::Owned: Leak<B> {
fn leak(self) -> &'a B {
match self {
Cow::Owned(x) => x.leak(),
Cow::Borrowed(x) => x,
}
}
}
#[cfg(test)]
mod test {
use super::LeakyCow;
use std::borrow::Cow;
#[test]
fn test_string() {
let _ = {
let c = Cow::Borrowed("Let it go!");
c.leak();
};
}
}