Enum yoke::either::EitherCart
source · pub enum EitherCart<C0, C1> {
A(C0),
B(C1),
}
Expand description
A cart that can be one type or the other. Enables ergonomic polymorphic carts.
EitherCart
enables yokes originating from different data sources and therefore
having different cart types to be merged into the same yoke type, but still being
able to recover the original cart type if necessary.
All relevant Cart traits are implemented for EitherCart
, and carts can be
safely wrapped in an EitherCart
.
Also see Yoke::erase_box_cart()
.
Examples
use std::borrow::Cow;
use std::rc::Rc;
use yoke::either::EitherCart;
use yoke::Yoke;
let y1: Yoke<&'static str, Rc<str>> =
Yoke::attach_to_zero_copy_cart("reference counted hello world".into());
let y2: Yoke<&'static str, &str> = Yoke::attach_to_zero_copy_cart("borrowed hello world");
type CombinedYoke<'a> = Yoke<&'static str, EitherCart<Rc<str>, &'a str>>;
// Both yokes can be combined into a single yoke type despite different carts
let y3: CombinedYoke = y1.wrap_cart_in_either_a();
let y4: CombinedYoke = y2.wrap_cart_in_either_b();
assert_eq!(*y3.get(), "reference counted hello world");
assert_eq!(*y4.get(), "borrowed hello world");
// The resulting yoke is cloneable if both cart types implement CloneableCart
let y5 = y4.clone();
assert_eq!(*y5.get(), "borrowed hello world");
Variants§
Trait Implementations§
source§impl<C0: Clone, C1: Clone> Clone for EitherCart<C0, C1>
impl<C0: Clone, C1: Clone> Clone for EitherCart<C0, C1>
source§fn clone(&self) -> EitherCart<C0, C1>
fn clone(&self) -> EitherCart<C0, C1>
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl<C0, C1, T> Deref for EitherCart<C0, C1>where
C0: Deref<Target = T>,
C1: Deref<Target = T>,
impl<C0, C1, T> Deref for EitherCart<C0, C1>where C0: Deref<Target = T>, C1: Deref<Target = T>,
source§impl<C0: PartialEq, C1: PartialEq> PartialEq for EitherCart<C0, C1>
impl<C0: PartialEq, C1: PartialEq> PartialEq for EitherCart<C0, C1>
source§fn eq(&self, other: &EitherCart<C0, C1>) -> bool
fn eq(&self, other: &EitherCart<C0, C1>) -> bool
This method tests for
self
and other
values to be equal, and is used
by ==
.impl<C0, C1> CloneableCart for EitherCart<C0, C1>where C0: CloneableCart, C1: CloneableCart,
impl<C0: Eq, C1: Eq> Eq for EitherCart<C0, C1>
impl<C0, C1, T> StableDeref for EitherCart<C0, C1>where C0: StableDeref + Deref<Target = T>, C1: StableDeref + Deref<Target = T>,
impl<C0, C1> StructuralEq for EitherCart<C0, C1>
impl<C0, C1> StructuralPartialEq for EitherCart<C0, C1>
Auto Trait Implementations§
impl<C0, C1> RefUnwindSafe for EitherCart<C0, C1>where C0: RefUnwindSafe, C1: RefUnwindSafe,
impl<C0, C1> Send for EitherCart<C0, C1>where C0: Send, C1: Send,
impl<C0, C1> Sync for EitherCart<C0, C1>where C0: Sync, C1: Sync,
impl<C0, C1> Unpin for EitherCart<C0, C1>where C0: Unpin, C1: Unpin,
impl<C0, C1> UnwindSafe for EitherCart<C0, C1>where C0: UnwindSafe, C1: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more