takecell

takecell provides two new cell-like types, TakeCell and TakeOwnCell. Both may store arbitrary non-Copy types, can be read from at most once and provide direct unique access to the stored contents. The core API looks roughly like this:

impl<T> TakeCell<T> {
    const fn new(v: T) -> Self { ... }
}
impl<T: ?Sized> TakeCell<T> {
    fn take(&self) -> Option<&mut T> { ... }
}

impl<T> TakeOwnCell<T> {
    const fn new(v: T) -> Self { ... }
    fn take(&self) -> Option<T> { ... }
}