1.0.0[][src]Trait nom::lib::std::prelude::v1::v1::Ord

#[lang = "ord"]
pub trait Ord: Eq + PartialOrd<Self> {
    fn cmp(&self, other: &Self) -> Ordering;

    fn max(self, other: Self) -> Self { ... }
fn min(self, other: Self) -> Self { ... }
fn clamp(self, min: Self, max: Self) -> Self { ... } }

Trait for types that form a total order.

An order is a total order if it is (for all a, b and c):

  • total and antisymmetric: exactly one of a < b, a == b or a > b is true; and
  • transitive, a < b and b < c implies a < c. The same must hold for both == and >.

Derivable

This trait can be used with #[derive]. When derived on structs, it will produce a lexicographic ordering based on the top-to-bottom declaration order of the struct's members. When derived on enums, variants are ordered by their top-to-bottom declaration order.

How can I implement Ord?

Ord requires that the type also be PartialOrd and Eq (which requires PartialEq).

Then you must define an implementation for cmp(). You may find it useful to use cmp() on your type's fields.

Implementations of PartialEq, PartialOrd, and Ord must agree with each other. That is, a.cmp(b) == Ordering::Equal if and only if a == b and Some(a.cmp(b)) == a.partial_cmp(b) for all a and b. It's easy to accidentally make them disagree by deriving some of the traits and manually implementing others.

Here's an example where you want to sort people by height only, disregarding id and name:

use std::cmp::Ordering;

#[derive(Eq)]
struct Person {
    id: u32,
    name: String,
    height: u32,
}

impl Ord for Person {
    fn cmp(&self, other: &Self) -> Ordering {
        self.height.cmp(&other.height)
    }
}

impl PartialOrd for Person {
    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
        Some(self.cmp(other))
    }
}

impl PartialEq for Person {
    fn eq(&self, other: &Self) -> bool {
        self.height == other.height
    }
}

Required methods

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

By convention, self.cmp(&other) returns the ordering matching the expression self <operator> other if true.

Examples

use std::cmp::Ordering;

assert_eq!(5.cmp(&10), Ordering::Less);
assert_eq!(10.cmp(&5), Ordering::Greater);
assert_eq!(5.cmp(&5), Ordering::Equal);
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Provided methods

fn max(self, other: Self) -> Self1.21.0

Compares and returns the maximum of two values.

Returns the second argument if the comparison determines them to be equal.

Examples

assert_eq!(2, 1.max(2));
assert_eq!(2, 2.max(2));

fn min(self, other: Self) -> Self1.21.0

Compares and returns the minimum of two values.

Returns the first argument if the comparison determines them to be equal.

Examples

assert_eq!(1, 1.min(2));
assert_eq!(2, 2.min(2));

fn clamp(self, min: Self, max: Self) -> Self

🔬 This is a nightly-only experimental API. (clamp)

Restrict a value to a certain interval.

Returns max if self is greater than max, and min if self is less than min. Otherwise this returns self.

Panics

Panics if min > max.

Examples

#![feature(clamp)]

assert!((-3).clamp(-2, 1) == -2);
assert!(0.clamp(-2, 1) == 0);
assert!(2.clamp(-2, 1) == 1);
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Implementations on Foreign Types

impl Ord for CString[src]

impl<'_> Ord for Components<'_>[src]

impl Ord for Ipv4Addr[src]

impl Ord for IpAddr[src]

impl Ord for OsString[src]

impl Ord for OsStr[src]

impl Ord for Path[src]

impl Ord for ErrorKind[src]

impl Ord for Ipv6Addr[src]

impl Ord for Instant[src]

impl<'a> Ord for Component<'a>[src]

impl Ord for PathBuf[src]

impl<'_> Ord for PrefixComponent<'_>[src]

impl Ord for SystemTime[src]

impl Ord for CStr[src]

impl<'a> Ord for Prefix<'a>[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, J, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D> Ord for unsafe extern "C" fn(A, B, C, D, VaListImpl) -> Ret[src]

impl Ord for NonZeroU8[src]

impl<A, B, C, D, E, F, G, H, I, J, K, L> Ord for (A, B, C, D, E, F, G, H, I, J, K, L) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord,
    G: Ord,
    H: Ord,
    I: Ord,
    J: Ord,
    K: Ord,
    L: Ord + ?Sized
[src]

impl<Ret, A, B> Ord for fn(A, B) -> Ret[src]

impl<Ret, A, B, C, D, E, F> Ord for extern "C" fn(A, B, C, D, E, F, VaListImpl) -> Ret[src]

impl Ord for NonZeroU32[src]

impl<Ret, A, B, C, D, E, F> Ord for unsafe fn(A, B, C, D, E, F) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J> Ord for unsafe fn(A, B, C, D, E, F, G, H, I, J) -> Ret[src]

impl<Ret, A, B> Ord for unsafe extern "C" fn(A, B, VaListImpl) -> Ret[src]

impl Ord for NonZeroI32[src]

impl Ord for CpuidResult[src]

impl<A, B, C, D, E, F, G> Ord for (A, B, C, D, E, F, G) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord,
    G: Ord + ?Sized
[src]

impl<T> Ord for RefCell<T> where
    T: Ord + ?Sized
[src]

fn cmp(&self, other: &RefCell<T>) -> Ordering[src]

Panics

Panics if the value in either RefCell is currently borrowed.

impl<Ret, A, B, C> Ord for unsafe fn(A, B, C) -> Ret[src]

impl<A, B, C, D, E> Ord for (A, B, C, D, E) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord + ?Sized
[src]

impl Ord for u8[src]

impl<Ret, A, B, C, D> Ord for extern "C" fn(A, B, C, D) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Ord for fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I> Ord for fn(A, B, C, D, E, F, G, H, I) -> Ret[src]

impl<Ret, A, B, C, D> Ord for extern "C" fn(A, B, C, D, VaListImpl) -> Ret[src]

impl Ord for NonZeroU64[src]

impl Ord for NonZeroIsize[src]

impl Ord for char[src]

impl<Ret, A, B, C, D, E, F> Ord for fn(A, B, C, D, E, F) -> Ret[src]

impl<Ret, A, B, C> Ord for unsafe extern "C" fn(A, B, C) -> Ret[src]

impl<Ret, A, B> Ord for extern "C" fn(A, B) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G> Ord for extern "C" fn(A, B, C, D, E, F, G) -> Ret[src]

impl Ord for NonZeroU128[src]

impl Ord for ![src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, VaListImpl) -> Ret[src]

impl<Ret, A, B, C> Ord for extern "C" fn(A, B, C, VaListImpl) -> Ret[src]

impl<A, B, C> Ord for (A, B, C) where
    A: Ord,
    B: Ord,
    C: Ord + ?Sized
[src]

impl<'_, A> Ord for &'_ mut A where
    A: Ord + ?Sized
[src]

impl<Ret, A> Ord for unsafe extern "C" fn(A) -> Ret[src]

impl Ord for u64[src]

impl<Ret, A, B, C, D, E, F, G, H> Ord for fn(A, B, C, D, E, F, G, H) -> Ret[src]

impl Ord for u128[src]

impl Ord for PhantomPinned[src]

impl<'_, A> Ord for &'_ A where
    A: Ord + ?Sized
[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D, E> Ord for unsafe extern "C" fn(A, B, C, D, E) -> Ret[src]

impl<Ret, A, B, C, D> Ord for unsafe fn(A, B, C, D) -> Ret[src]

impl<Ret, A, B, C> Ord for extern "C" fn(A, B, C) -> Ret[src]

impl<Ret, A> Ord for unsafe extern "C" fn(A, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, VaListImpl) -> Ret[src]

impl<A, B, C, D, E, F, G, H, I, J, K> Ord for (A, B, C, D, E, F, G, H, I, J, K) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord,
    G: Ord,
    H: Ord,
    I: Ord,
    J: Ord,
    K: Ord + ?Sized
[src]

impl<Ret, A, B, C, D, E, F, G> Ord for unsafe fn(A, B, C, D, E, F, G) -> Ret[src]

impl Ord for i16[src]

impl<Ret, A, B> Ord for unsafe fn(A, B) -> Ret[src]

impl<A, B, C, D> Ord for (A, B, C, D) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord + ?Sized
[src]

impl Ord for NonZeroI8[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Ord for unsafe fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G) -> Ret[src]

impl Ord for bool[src]

impl Ord for i32[src]

impl<Ret, A, B, C, D, E, F, G> Ord for fn(A, B, C, D, E, F, G) -> Ret[src]

impl Ord for Duration[src]

impl<Ret, A, B, C, D, E, F, G, H> Ord for unsafe fn(A, B, C, D, E, F, G, H) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, VaListImpl) -> Ret[src]

impl<A, B, C, D, E, F, G, H, I, J> Ord for (A, B, C, D, E, F, G, H, I, J) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord,
    G: Ord,
    H: Ord,
    I: Ord,
    J: Ord + ?Sized
[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret[src]

impl<Ret, A> Ord for extern "C" fn(A, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret[src]

impl<T> Ord for Wrapping<T> where
    T: Ord
[src]

impl<A, B, C, D, E, F> Ord for (A, B, C, D, E, F) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord + ?Sized
[src]

impl<Ret, A, B, C, D, E> Ord for fn(A, B, C, D, E) -> Ret[src]

impl<Ret> Ord for unsafe fn() -> Ret[src]

impl<Ret, A, B, C, D> Ord for fn(A, B, C, D) -> Ret[src]

impl<Ret> Ord for extern "C" fn() -> Ret[src]

impl<Ret, A, B, C, D> Ord for unsafe extern "C" fn(A, B, C, D) -> Ret[src]

impl Ord for u16[src]

impl Ord for i8[src]

impl Ord for u32[src]

impl<Ret, A, B, C, D, E> Ord for unsafe fn(A, B, C, D, E) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, VaListImpl) -> Ret[src]

impl<Ret, A, B> Ord for unsafe extern "C" fn(A, B) -> Ret[src]

impl<A, B, C, D, E, F, G, H, I> Ord for (A, B, C, D, E, F, G, H, I) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord,
    G: Ord,
    H: Ord,
    I: Ord + ?Sized
[src]

impl<T> Ord for PhantomData<T> where
    T: ?Sized
[src]

impl<Ret, A> Ord for fn(A) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I> Ord for unsafe fn(A, B, C, D, E, F, G, H, I) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret[src]

impl<P> Ord for Pin<P> where
    P: Ord
[src]

impl<T> Ord for Cell<T> where
    T: Copy + Ord
[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K> Ord for unsafe fn(A, B, C, D, E, F, G, H, I, J, K) -> Ret[src]

impl<T> Ord for Poll<T> where
    T: Ord
[src]

impl<T> Ord for *mut T where
    T: ?Sized
[src]

impl<Ret, A, B, C, D, E, F, G> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H> Ord for extern "C" fn(A, B, C, D, E, F, G, H, VaListImpl) -> Ret[src]

impl Ord for NonZeroUsize[src]

impl<Ret, A, B, C, D, E, F> Ord for extern "C" fn(A, B, C, D, E, F) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Ret[src]

impl<A, B> Ord for (A, B) where
    A: Ord,
    B: Ord + ?Sized
[src]

impl Ord for usize[src]

impl<A> Ord for (A,) where
    A: Ord + ?Sized
[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret[src]

impl Ord for i64[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J, K, L, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D, E> Ord for extern "C" fn(A, B, C, D, E, VaListImpl) -> Ret[src]

impl<Ret, A, B> Ord for extern "C" fn(A, B, VaListImpl) -> Ret[src]

impl<A, B, C, D, E, F, G, H> Ord for (A, B, C, D, E, F, G, H) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord,
    E: Ord,
    F: Ord,
    G: Ord,
    H: Ord + ?Sized
[src]

impl Ord for NonZeroI64[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I, J) -> Ret[src]

impl<Ret, A, B, C> Ord for fn(A, B, C) -> Ret[src]

impl<Ret, A> Ord for extern "C" fn(A) -> Ret[src]

impl Ord for NonZeroI128[src]

impl<Ret, A, B, C, D, E, F, G, H> Ord for extern "C" fn(A, B, C, D, E, F, G, H) -> Ret[src]

impl<Ret, A, B, C, D, E, F> Ord for unsafe extern "C" fn(A, B, C, D, E, F, VaListImpl) -> Ret[src]

impl<Ret, A, B, C> Ord for unsafe extern "C" fn(A, B, C, VaListImpl) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I, J, K, L> Ord for fn(A, B, C, D, E, F, G, H, I, J, K, L) -> Ret[src]

impl<const N: usize, T> Ord for [T; N] where
    T: Ord,
    [T; N]: LengthAtMost32
[src]

impl Ord for ()[src]

impl Ord for i128[src]

impl<T> Ord for NonNull<T> where
    T: ?Sized
[src]

impl<Ret, A, B, C, D, E, F> Ord for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret[src]

impl<Ret> Ord for unsafe extern "C" fn() -> Ret[src]

impl<Ret, A> Ord for unsafe fn(A) -> Ret[src]

impl<Ret, A, B, C, D, E> Ord for unsafe extern "C" fn(A, B, C, D, E, VaListImpl) -> Ret[src]

impl Ord for isize[src]

impl<T> Ord for [T] where
    T: Ord
[src]

Implements comparison of vectors lexicographically.

impl<Ret, A, B, C, D, E, F, G> Ord for extern "C" fn(A, B, C, D, E, F, G, VaListImpl) -> Ret[src]

impl<Ret> Ord for fn() -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, VaListImpl) -> Ret[src]

impl Ord for TypeId[src]

impl Ord for UnicodeVersion[src]

impl<Ret, A, B, C, D, E, F, G, H, I> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I, VaListImpl) -> Ret[src]

impl<T> Ord for *const T where
    T: ?Sized
[src]

impl Ord for NonZeroI16[src]

impl Ord for str[src]

Implements ordering of strings.

Strings are ordered lexicographically by their byte values. This orders Unicode code points based on their positions in the code charts. This is not necessarily the same as "alphabetical" order, which varies by language and locale. Sorting strings according to culturally-accepted standards requires locale-specific data that is outside the scope of the str type.

impl<Ret, A, B, C, D, E, F, G, H, I, J> Ord for fn(A, B, C, D, E, F, G, H, I, J) -> Ret[src]

impl<Ret, A, B, C, D, E, F, G, H, I> Ord for extern "C" fn(A, B, C, D, E, F, G, H, I) -> Ret[src]

impl<Ret, A, B, C, D, E> Ord for extern "C" fn(A, B, C, D, E) -> Ret[src]

impl Ord for NonZeroU16[src]

impl<T> Ord for Arc<T> where
    T: Ord + ?Sized
[src]

fn cmp(&self, other: &Arc<T>) -> Ordering[src]

Comparison for two Arcs.

The two are compared by calling cmp() on their inner values.

Examples

use std::sync::Arc;
use std::cmp::Ordering;

let five = Arc::new(5);

assert_eq!(Ordering::Less, five.cmp(&Arc::new(6)));

impl<T> Ord for Rc<T> where
    T: Ord + ?Sized
[src]

fn cmp(&self, other: &Rc<T>) -> Ordering[src]

Comparison for two Rcs.

The two are compared by calling cmp() on their inner values.

Examples

use std::rc::Rc;
use std::cmp::Ordering;

let five = Rc::new(5);

assert_eq!(Ordering::Less, five.cmp(&Rc::new(6)));

impl Ord for Literal

impl Ord for Span

impl Ord for Position

impl Ord for ClassUnicodeRange

impl Ord for ClassBytesRange

impl Ord for ErrorCode[src]

impl Ord for Error[src]

impl<A> Ord for StackVec<A> where
    A: Array,
    <A as Array>::Item: Ord

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Implementors

impl Ord for Infallible[src]

impl Ord for nom::lib::std::fmt::Error[src]

impl Ord for Ordering[src]

impl Ord for NoneError[src]

impl Ord for String[src]

impl<'_, B> Ord for Cow<'_, B> where
    B: Ord + ToOwned + ?Sized
[src]

impl<A> Ord for VecDeque<A> where
    A: Ord
[src]

impl<K, V> Ord for BTreeMap<K, V> where
    K: Ord,
    V: Ord
[src]

impl<T> Ord for Option<T> where
    T: Ord
[src]

impl<T> Ord for Reverse<T> where
    T: Ord
[src]

impl<T> Ord for BTreeSet<T> where
    T: Ord
[src]

impl<T> Ord for LinkedList<T> where
    T: Ord
[src]

impl<T> Ord for ManuallyDrop<T> where
    T: Ord + ?Sized
[src]

impl<T> Ord for Box<T> where
    T: Ord + ?Sized
[src]

impl<T> Ord for Vec<T> where
    T: Ord
[src]

Implements ordering of vectors, lexicographically.

impl<T, E> Ord for Result<T, E> where
    E: Ord,
    T: Ord
[src]

impl<Y, R> Ord for GeneratorState<Y, R> where
    R: Ord,
    Y: Ord
[src]

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