flams_router_vscode::server_fn::inventory::core::cmp

Trait Eq

1.6.0 · Source

pub trait Eq: PartialEq { }

Expand description

Trait for comparisons corresponding to equivalence relations.

The primary difference to PartialEq is the additional requirement for reflexivity. A type that implements PartialEq guarantees that for all a, b and c:

symmetric: a == b implies b == a and a != b implies !(a == b)
transitive: a == b and b == c implies a == c

Eq, which builds on top of PartialEq also implies:

reflexive: a == a

This property cannot be checked by the compiler, and therefore Eq is a trait without methods.

Violating this property is a logic error. The behavior resulting from a logic error is not specified, but users of the trait must ensure that such logic errors do not result in undefined behavior. This means that unsafe code must not rely on the correctness of these methods.

Floating point types such as f32 and f64 implement only PartialEq but not Eq because NaN != NaN.

§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 extra 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 {}

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Trait EqCopy item path

§Derivable

§How can I implement Eq?

Dyn Compatibility§

Implementors§

impl Eq for LoginError

impl Eq for ArchiveIndex

impl Eq for ArgMode

impl Eq for Informal

impl Eq for flams_ontology::content::terms::Term

impl Eq for flams_ontology::content::terms::Var

impl Eq for FTMLKey

impl Eq for flams_ontology::languages::Language

impl Eq for NotationComponent

impl Eq for ParagraphFormatting

impl Eq for ParagraphKind

impl Eq for CognitiveDimension

impl Eq for SectionLevel

impl Eq for ContentURI

impl Eq for URI

impl Eq for NarrativeURI

impl Eq for TermURI

impl Eq for LoginState

impl Eq for URIKind

impl Eq for FileState

impl Eq for Dependency

impl Eq for TaskState

impl Eq for CSS

impl Eq for CowStr

impl Eq for LogLevel

impl Eq for ThemeType

impl Eq for Env

impl Eq for ReloadWSProtocol

impl Eq for ServerFnErrorErr

impl Eq for flams_router_vscode::server_fn::axum_export::extract::path::ErrorKind

impl Eq for flams_router_vscode::server_fn::axum_export::extract::ws::Message

impl Eq for AsciiChar

impl Eq for flams_router_vscode::server_fn::inventory::core::convert::Infallible

impl Eq for FromBytesWithNulError

impl Eq for flams_router_vscode::server_fn::inventory::core::fmt::Alignment

impl Eq for DebugAsHex

impl Eq for flams_router_vscode::server_fn::inventory::core::fmt::Sign

impl Eq for AtomicOrdering

impl Eq for flams_router_vscode::server_fn::inventory::core::net::IpAddr

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

impl Eq for FpCategory

impl Eq for IntErrorKind

impl Eq for flams_router_vscode::server_fn::inventory::core::slice::GetDisjointMutError

impl Eq for SearchStep

impl Eq for flams_router_vscode::server_fn::inventory::core::sync::atomic::Ordering

impl Eq for flams_router_vscode::server_fn::inventory::core::cmp::Ordering

impl Eq for alloc::collections::TryReserveErrorKind

impl Eq for ConversionErrorKind

impl Eq for proc_macro::Delimiter

impl Eq for proc_macro::Spacing

impl Eq for BacktraceStatus

impl Eq for VarError

impl Eq for std::io::SeekFrom

impl Eq for std::io::error::ErrorKind

impl Eq for std::net::Shutdown

impl Eq for BacktraceStyle

impl Eq for std::sync::mpsc::RecvTimeoutError

impl Eq for std::sync::mpsc::TryRecvError

impl Eq for bincode::config::Endianness

impl Eq for IntEncoding

impl Eq for AllowedEnumVariants

impl Eq for IntegerType

impl Eq for Colons

impl Eq for Fixed

impl Eq for Numeric

impl Eq for chrono::format::OffsetPrecision

impl Eq for Pad

impl Eq for ParseErrorKind

impl Eq for SecondsFormat

impl Eq for chrono::month::Month

impl Eq for RoundingError

impl Eq for chrono::weekday::Weekday

impl Eq for FlushCompress

impl Eq for FlushDecompress

Trait Eq

§How can I implement `Eq`?