Enum otter_api_tests::cmp::Ordering 1.0.0[−][src]
pub enum Ordering { Less, Equal, Greater, }
Expand description
An Ordering
is the result of a comparison between two values.
Examples
use std::cmp::Ordering; let result = 1.cmp(&2); assert_eq!(Ordering::Less, result); let result = 1.cmp(&1); assert_eq!(Ordering::Equal, result); let result = 2.cmp(&1); assert_eq!(Ordering::Greater, result);
Variants
An ordering where a compared value is less than another.
An ordering where a compared value is equal to another.
An ordering where a compared value is greater than another.
Implementations
Returns true
if the ordering is the Equal
variant.
Examples
use std::cmp::Ordering; assert_eq!(Ordering::Less.is_eq(), false); assert_eq!(Ordering::Equal.is_eq(), true); assert_eq!(Ordering::Greater.is_eq(), false);
Returns true
if the ordering is not the Equal
variant.
Examples
use std::cmp::Ordering; assert_eq!(Ordering::Less.is_ne(), true); assert_eq!(Ordering::Equal.is_ne(), false); assert_eq!(Ordering::Greater.is_ne(), true);
Returns true
if the ordering is the Less
variant.
Examples
use std::cmp::Ordering; assert_eq!(Ordering::Less.is_lt(), true); assert_eq!(Ordering::Equal.is_lt(), false); assert_eq!(Ordering::Greater.is_lt(), false);
Returns true
if the ordering is the Greater
variant.
Examples
use std::cmp::Ordering; assert_eq!(Ordering::Less.is_gt(), false); assert_eq!(Ordering::Equal.is_gt(), false); assert_eq!(Ordering::Greater.is_gt(), true);
Returns true
if the ordering is either the Less
or Equal
variant.
Examples
use std::cmp::Ordering; assert_eq!(Ordering::Less.is_le(), true); assert_eq!(Ordering::Equal.is_le(), true); assert_eq!(Ordering::Greater.is_le(), false);
Returns true
if the ordering is either the Greater
or Equal
variant.
Examples
use std::cmp::Ordering; assert_eq!(Ordering::Less.is_ge(), false); assert_eq!(Ordering::Equal.is_ge(), true); assert_eq!(Ordering::Greater.is_ge(), true);
Reverses the Ordering
.
Less
becomesGreater
.Greater
becomesLess
.Equal
becomesEqual
.
Examples
Basic behavior:
use std::cmp::Ordering; assert_eq!(Ordering::Less.reverse(), Ordering::Greater); assert_eq!(Ordering::Equal.reverse(), Ordering::Equal); assert_eq!(Ordering::Greater.reverse(), Ordering::Less);
This method can be used to reverse a comparison:
let data: &mut [_] = &mut [2, 10, 5, 8]; // sort the array from largest to smallest. data.sort_by(|a, b| a.cmp(b).reverse()); let b: &mut [_] = &mut [10, 8, 5, 2]; assert!(data == b);
Chains two orderings.
Returns self
when it’s not Equal
. Otherwise returns other
.
Examples
use std::cmp::Ordering; let result = Ordering::Equal.then(Ordering::Less); assert_eq!(result, Ordering::Less); let result = Ordering::Less.then(Ordering::Equal); assert_eq!(result, Ordering::Less); let result = Ordering::Less.then(Ordering::Greater); assert_eq!(result, Ordering::Less); let result = Ordering::Equal.then(Ordering::Equal); assert_eq!(result, Ordering::Equal); let x: (i64, i64, i64) = (1, 2, 7); let y: (i64, i64, i64) = (1, 5, 3); let result = x.0.cmp(&y.0).then(x.1.cmp(&y.1)).then(x.2.cmp(&y.2)); assert_eq!(result, Ordering::Less);
Chains the ordering with the given function.
Returns self
when it’s not Equal
. Otherwise calls f
and returns
the result.
Examples
use std::cmp::Ordering; let result = Ordering::Equal.then_with(|| Ordering::Less); assert_eq!(result, Ordering::Less); let result = Ordering::Less.then_with(|| Ordering::Equal); assert_eq!(result, Ordering::Less); let result = Ordering::Less.then_with(|| Ordering::Greater); assert_eq!(result, Ordering::Less); let result = Ordering::Equal.then_with(|| Ordering::Equal); assert_eq!(result, Ordering::Equal); let x: (i64, i64, i64) = (1, 2, 7); let y: (i64, i64, i64) = (1, 5, 3); let result = x.0.cmp(&y.0).then_with(|| x.1.cmp(&y.1)).then_with(|| x.2.cmp(&y.2)); assert_eq!(result, Ordering::Less);
Trait Implementations
This method returns an ordering between self
and other
values if one exists. Read more
This method tests less than (for self
and other
) and is used by the <
operator. Read more
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
Auto Trait Implementations
impl RefUnwindSafe for Ordering
impl UnwindSafe for Ordering
Blanket Implementations
Mutably borrows from an owned value. Read more
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<R, Global>
impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<I, A> Iterator for Box<I, A> where
A: Allocator,
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;
pub fn into_any(self: Box<T, Global>) -> Box<dyn Any + 'static, Global>ⓘNotable traits for Box<R, Global>
impl<R> Read for Box<R, Global> where
R: Read + ?Sized, impl<W> Write for Box<W, Global> where
W: Write + ?Sized, impl<I, A> Iterator for Box<I, A> where
A: Allocator,
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<F, A> Future for Box<F, A> where
A: Allocator + 'static,
F: Future + Unpin + ?Sized, type Output = <F as Future>::Output;
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
pub fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
pub fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
impl<A> DynCastExt for A
impl<A> DynCastExt for A
pub fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
T: ?Sized,
A: DynCastExtHelper<T>,
pub fn dyn_cast<T>(
self
) -> Result<<A as DynCastExtHelper<T>>::Target, <A as DynCastExtHelper<T>>::Source> where
T: ?Sized,
A: DynCastExtHelper<T>,
Use this to cast from one trait object type to another. Read more
pub fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
T: ?Sized,
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
pub fn dyn_upcast<T>(self) -> <A as DynCastExtAdvHelper<T, T>>::Target where
T: ?Sized,
A: DynCastExtAdvHelper<T, T, Source = <A as DynCastExtAdvHelper<T, T>>::Target>,
Use this to upcast a trait to one of its supertraits. Read more
pub fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
T: ?Sized,
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
pub fn dyn_cast_adv<F, T>(
self
) -> Result<<A as DynCastExtAdvHelper<F, T>>::Target, <A as DynCastExtAdvHelper<F, T>>::Source> where
T: ?Sized,
A: DynCastExtAdvHelper<F, T>,
F: ?Sized,
pub fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
pub fn dyn_cast_with_config<C>(
self
) -> Result<<A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Target, <A as DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>>::Source> where
C: DynCastConfig,
A: DynCastExtAdvHelper<<C as DynCastConfig>::Source, <C as DynCastConfig>::Target>,
Use this to cast from one trait object type to another. With this method the type parameter is a config type that uniquely specifies which cast should be preformed. Read more
Compare self to key
and return true
if they are equal.
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]
fn instrument(self, span: Span) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]Instruments this type with the provided Span
, returning an
Instrumented
wrapper. Read more
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]
fn in_current_span(self) -> Instrumented<Self>ⓘNotable traits for Instrumented<T>
impl<T> Future for Instrumented<T> where
T: Future, type Output = <T as Future>::Output;
[src]pub fn vzip(self) -> V