Enum static_cow::ChangeOrKeep

pub enum ChangeOrKeep<'o, T>where
    T: ToOwning<'o>,{
    Change(T),
    Keep(T::Owning),
}

An Idempotent implementation whose owning-ness is determined at runtime.

Variants

Change(T)

A T that has not yet been transformed.

Keep(T::Owning)

A T::Owning which has already been transformed from a T.

Trait Implementations

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

fn to_ref(&self) -> IdemRef<'_, 'o, T>

Get a reference to either a T or a T::Owning.

fn to_mut(&mut self) -> IdemMut<'_, 'o, T>

Get a mutable reference to either a T or a T::Owning.

fn into_kept(self) -> T::Owning

Converts self into a T::Owning; equivalent to into_owning().0.

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

fn into_owning(self) -> Self::Owning

Converts an object which owns its contents into one which borrows them.

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>

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

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

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