1.0.0[][src]Trait nom::lib::std::cmp::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 { ... } }

Trait for types that form a total order.

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

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. 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: &Person) -> Ordering {
        self.height.cmp(&other.height)
    }
}

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

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

Required Methods

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);

Provided Methods

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));

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));

Implementations on Foreign Types

impl Ord for OsStr
[src]

impl Ord for IpAddr
[src]

impl Ord for CStr
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impl Ord for PathBuf
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impl<'a> Ord for Components<'a>
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impl<'a> Ord for Component<'a>
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impl Ord for Ipv6Addr
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impl Ord for CString
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impl Ord for Path
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impl Ord for ErrorKind
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impl<'a> Ord for PrefixComponent<'a>
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impl Ord for SystemTime
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impl Ord for Instant
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impl Ord for OsString
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impl Ord for Ipv4Addr
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impl<'a> Ord for Prefix<'a>
[src]

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

Panics

Panics if the value in either RefCell is currently borrowed.

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

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

impl<T> Ord for [T; 8] where
    T: Ord
[src]

impl Ord for NonZeroU64
[src]

impl<T> Ord for [T; 28] where
    T: Ord
[src]

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

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

impl Ord for Pinned
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impl<T> Ord for [T; 29] where
    T: Ord
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impl<Ret, A, B, C, D, E, F> Ord for extern "C" fn(A, B, C, D, E, F, ...) -> Ret
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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 UnicodeVersion
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impl Ord for i16
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impl<Ret, A, B, C, D, E, F> Ord for unsafe extern "C" fn(A, B, C, D, E, F) -> Ret
[src]

impl<T> Ord for [T; 2] where
    T: Ord
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impl<T> Ord for [T; 21] where
    T: Ord
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impl<T> Ord for [T; 9] where
    T: Ord
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impl<T> Ord for [T; 18] where
    T: Ord
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impl Ord for NonZeroU128
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impl<A> Ord for (A,) where
    A: Ord + ?Sized
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impl<Ret, A, B, C, D> Ord for unsafe fn(A, B, C, D) -> Ret
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impl<T> Ord for [T; 25] where
    T: Ord
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impl<T> Ord for [T; 6] where
    T: Ord
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impl<Ret, A, B> Ord for unsafe extern "C" fn(A, B, ...) -> Ret
[src]

impl Ord for u8
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impl<Ret> Ord for extern "C" fn() -> Ret
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impl<T> Ord for Cell<T> where
    T: Copy + Ord
[src]

impl<T> Ord for [T; 0] where
    T: Ord
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impl<T> Ord for [T; 26] where
    T: Ord
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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 unsafe extern "C" fn(A, B, C, D) -> Ret
[src]

impl<Ret, A, B, C> Ord for fn(A, B, C) -> Ret
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impl<Ret, A, B, C, D, E, F> Ord for unsafe extern "C" fn(A, B, C, D, E, F, ...) -> 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<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<T> Ord for [T; 17] where
    T: Ord
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impl Ord for u16
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impl Ord for Duration
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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
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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<'a, A> Ord for &'a mut A where
    A: Ord + ?Sized
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impl<Ret, A, B, C, D, E> Ord for unsafe fn(A, B, C, D, E) -> Ret
[src]

impl<T> Ord for [T; 27] where
    T: Ord
[src]

impl<T> Ord for NonNull<T> where
    T: ?Sized
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impl Ord for NonZeroU32
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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<Ret, A, B, C> Ord for extern "C" fn(A, B, C) -> Ret
[src]

impl<Ret, A> Ord for fn(A) -> Ret
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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> Ord for unsafe extern "C" fn(A, B, C, ...) -> 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<T> Ord for [T; 19] where
    T: 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<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<T> Ord for [T; 22] where
    T: Ord
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impl Ord for i32
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impl<Ret, A, B> Ord for fn(A, B) -> Ret
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impl<T> Ord for [T; 20] where
    T: Ord
[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<A, B, C, D> Ord for (A, B, C, D) where
    A: Ord,
    B: Ord,
    C: Ord,
    D: Ord + ?Sized
[src]

impl Ord for bool
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impl<T> Ord for [T; 10] where
    T: Ord
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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<T> Ord for [T; 24] where
    T: Ord
[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<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> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, ...) -> Ret
[src]

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

impl<T> Ord for [T; 16] where
    T: Ord
[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<T> Ord for Wrapping<T> where
    T: Ord
[src]

impl Ord for u32
[src]

impl<Ret, A, B, C, D> Ord for extern "C" fn(A, B, C, D, ...) -> Ret
[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<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 [T; 11] where
    T: Ord
[src]

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

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

impl<T> Ord for [T; 31] where
    T: Ord
[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 Ord for isize
[src]

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

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

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

impl Ord for !
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impl<T> Ord for [T; 4] where
    T: Ord
[src]

impl<T> Ord for [T; 3] where
    T: Ord
[src]

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

impl<T> Ord for [T; 30] where
    T: Ord
[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 fn(A, B, C) -> Ret
[src]

impl Ord for NonZeroU8
[src]

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

impl Ord for NonZeroU16
[src]

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

impl<Ret, A> Ord for unsafe extern "C" fn(A) -> 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<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 u64
[src]

impl<Ret> Ord for fn() -> Ret
[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> 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, H, I, J, K> Ord for unsafe extern "C" 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, 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 i8
[src]

impl<T> Ord for [T; 5] where
    T: Ord
[src]

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

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

impl<T> Ord for [T; 12] where
    T: Ord
[src]

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

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

impl Ord for i128
[src]

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

Implements comparison of vectors lexicographically.

impl<T> Ord for [T; 1] where
    T: Ord
[src]

impl Ord for usize
[src]

impl<Ret, A> Ord for extern "C" fn(A) -> 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<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, 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 [T; 32] where
    T: Ord
[src]

impl Ord for NonZeroUsize
[src]

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

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

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

impl Ord for i64
[src]

impl<T> Ord for [T; 7] where
    T: Ord
[src]

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

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

impl Ord for TypeId
[src]

impl<T> Ord for [T; 13] where
    T: Ord
[src]

impl<T> Ord for [T; 23] where
    T: Ord
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impl<Ret, A, B, C, D, E> Ord for extern "C" fn(A, B, C, D, E) -> Ret
[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> Ord for unsafe extern "C" fn(A, B, C, D, E, F, G, H, ...) -> Ret
[src]

impl Ord for char
[src]

impl<T> Ord for [T; 15] where
    T: Ord
[src]

impl Ord for u128
[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<T> Ord for [T; 14] where
    T: Ord
[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<Ret, A> Ord for extern "C" fn(A, ...) -> 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 Arc<T> where
    T: Ord + ?Sized
[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]

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

Implementors

impl Ord for Ordering
[src]

impl Ord for Error
[src]

impl Ord for NoneError
[src]

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

impl<T> Ord for BTreeSet<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]