Trait origin_studio::std::cmp::Eq

1.0.0 · source ·

pub trait Eq: PartialEq<Self> { }

Expand description

Trait for equality comparisons which are equivalence relations.

This means, that in addition to a == b and a != b being strict inverses, the equality must be (for all a, b and c):

reflexive: a == a;
symmetric: a == b implies b == a; and
transitive: a == b and b == c implies a == c.

This property cannot be checked by the compiler, and therefore Eq implies PartialEq, and has no extra methods.

Derivable

This trait can be used with #[derive]. When derived, because Eq has no extra methods, it is only informing the compiler that this is an equivalence relation rather than a partial equivalence relation. Note that the derive strategy requires all fields are Eq, which isn’t always desired.

How can I implement `Eq`?

If you cannot use the derive strategy, specify that your type implements Eq, which has no methods:

enum BookFormat { Paperback, Hardback, Ebook }
struct Book {
    isbn: i32,
    format: BookFormat,
}
impl PartialEq for Book {
    fn eq(&self, other: &Self) -> bool {
        self.isbn == other.isbn
    }
}
impl Eq for Book {}

Trait origin_studio::std::cmp::Eq

Derivable

How can I implement Eq?

Implementors§

impl Eq for AsciiChar

impl Eq for TryReserveErrorKind

impl Eq for Infallible

impl Eq for VarError

impl Eq for origin_studio::std::fmt::Alignment

impl Eq for IpAddr

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

impl Eq for FpCategory

impl Eq for IntErrorKind

impl Eq for Which

impl Eq for SearchStep

impl Eq for origin_studio::std::sync::atomic::Ordering

impl Eq for origin_studio::std::cmp::Ordering

impl Eq for rustix::backend::fs::types::Advice

impl Eq for FileType

impl Eq for FlockOperation

impl Eq for rustix::backend::mm::types::Advice

impl Eq for MembarrierCommand

impl Eq for Resource

impl Eq for FutexOperation

impl Eq for TimerfdClockId

impl Eq for ClockId

impl Eq for SeekFrom

impl Eq for Direction

impl Eq for DumpableBehavior

impl Eq for EndianMode

impl Eq for FloatingPointMode

impl Eq for MachineCheckMemoryCorruptionKillPolicy

impl Eq for PTracer

impl Eq for SpeculationFeature

impl Eq for TimeStampCounterReadability

impl Eq for TimingMethod

impl Eq for VirtualMemoryMapAddress

impl Eq for Signal

impl Eq for Capability

impl Eq for CoreSchedulingScope

impl Eq for SecureComputingMode

impl Eq for SysCallUserDispatchFastSwitch

impl Eq for LinkNameSpaceType

impl Eq for bool

impl Eq for char

impl Eq for i8

impl Eq for i16

impl Eq for i32

impl Eq for i64

impl Eq for i128

impl Eq for isize

impl Eq for !

impl Eq for str

impl Eq for u8

impl Eq for u16

impl Eq for u32

impl Eq for u64

impl Eq for u128

impl Eq for ()

impl Eq for usize

impl Eq for AllocError

impl Eq for Layout

impl Eq for LayoutError

impl Eq for TypeId

impl Eq for CpuidResult

impl Eq for CharTryFromError

impl Eq for DecodeUtf16Error

impl Eq for ParseCharError

impl Eq for TryFromCharError

impl Eq for TryReserveError

impl Eq for CString

impl Eq for FromVecWithNulError

impl Eq for IntoStringError

impl Eq for NulError

impl Eq for origin_studio::std::fmt::Error

impl Eq for PhantomPinned

impl Eq for Assume

impl Eq for AddrParseError

impl Eq for Ipv4Addr

How can I implement `Eq`?