Trait static_cow::ToOwning

pub trait ToOwning<'o> {
    type Owning: 'o;

    fn to_owning(&self) -> Self::Owning;
}

A generalization of ToOwned.

ToOwning is weaker than ToOwned because there is no constraint of Owning : Borrow<Self> as there is on ToOwned::Owned. Thus, ToOwning represents a type which can be converted from a reference into a related type that owns its contents, but unlike ToOwned doesn’t necessarily let you get a reference to the original type back out.

ToOwning has a blanket implementation for T where T : ToOwned, wherein Owning = Owned and to_owning = to_owned. User-defined types which implement ToOwning but not ToOwned typically should do so by calling .to_owning() on all their fields.

ToOwning's lifetime parameter 'o is the lifetime of the owning type. In most circumstances this can be 'static. This is only not the case if you have a ToOwning implementation that takes ownership of only some of its contents, while others continue to have constrained lifetime.

Required Associated Types

type Owning: 'o

The resulting type after obtaining ownership of self’s contents.

Required Methods

fn to_owning(&self) -> Self::Owning

Creates an object which owns its contents from one which borrows them.

Implementors

impl<'a, 'o, B> ToOwning<'o> for CowPhantom<'a, B>where
    B: 'o + ?Sized,

type Owning = CowPhantom<'o, B>

impl<'b, 'o, B> ToOwning<'o> for Borrowed<'b, B>where
    B: 'o + ToOwning<'o> + ?Sized,

type Owning = Owned<'o, B>

impl<'o, B> ToOwning<'o> for Owned<'o, B>where
    B: 'o + ToOwning<'o> + ?Sized,
    B::Owning: Borrow<B>,

type Owning = Owned<'o, B>

impl<'o, B> ToOwning<'o> for Bwhere
    B: ToOwned + ?Sized,
    B::Owned: 'o,

type Owning = <B as ToOwned>::Owned

impl<'o, T> ToOwning<'o> for ChangeOrKeep<'o, T>where
    T: 'o + ToOwning<'o>,
    T::Owning: ToOwning<'o, Owning = T::Owning>,

type Owning = Keep<'o, T>

impl<'o, T> ToOwning<'o> for Change<T>where
    T: 'o + ToOwning<'o>,

type Owning = Keep<'o, T>