rocket::mtls::x509::der_parser::asn1_rs::nom::lib::std::cmp

Trait Eq

1.0.0 · Source

pub trait Eq: PartialEq { }

Available on crate feature mtls only.

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 CliColors

impl Eq for Entity

impl Eq for rocket::http::Method

impl Eq for SameSite

impl Eq for StatusClass

impl Eq for PathError

impl Eq for Endpoint

impl Eq for Value

impl Eq for Feature

impl Eq for Sig

impl Eq for rocket::tls::CipherSuite

impl Eq for TraceFormat

impl Eq for Sign

impl Eq for ASN1TimeZone

impl Eq for Class

impl Eq for DerConstraint

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::Error

impl Eq for Explicit

impl Eq for Implicit

impl Eq for Length

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::Needed

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::nom::error::ErrorKind

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::nom::number::Endianness

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::nom::lib::std::collections::TryReserveErrorKind

impl Eq for Infallible

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::nom::lib::std::fmt::Alignment

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::nom::lib::std::str::pattern::SearchStep

impl Eq for rocket::mtls::x509::der_parser::asn1_rs::nom::lib::std::cmp::Ordering

impl Eq for AsciiChar

impl Eq for core::net::ip_addr::IpAddr

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

impl Eq for FpCategory

impl Eq for IntErrorKind

impl Eq for core::sync::atomic::Ordering

impl Eq for BacktraceStatus

impl Eq for VarError

impl Eq for std::io::SeekFrom

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

impl Eq for Shutdown

impl Eq for BacktraceStyle

impl Eq for RecvTimeoutError

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

impl Eq for allocator_api2::stable::raw_vec::TryReserveErrorKind

impl Eq for TlsProtocolId

impl Eq for AlgorithmId

impl Eq for OperatingMode

impl Eq for BlockCipherId

impl Eq for KeySize

impl Eq for point_conversion_form_t

impl Eq for ParseAlphabetError

impl Eq for base64::decode::DecodeError

impl Eq for DecodeSliceError

impl Eq for EncodeSliceError

impl Eq for DecodePaddingMode

impl Eq for BigEndian

impl Eq for LittleEndian

impl Eq for const_oid::error::Error

impl Eq for Expiration

impl Eq for cookie::parse::ParseError

impl Eq for BitOrder

impl Eq for DecodeKind

impl Eq for CoderResult

impl Eq for DecoderResult

impl Eq for EncoderResult

impl Eq for Latin1Bidi

impl Eq for PollNext

impl Eq for ErrorLevel

impl Eq for hashbrown::TryReserveError

impl Eq for httparse::Error

impl Eq for InlinableString

impl Eq for intrusive_collections::rbtree::Color

impl Eq for fsconfig_command

impl Eq for membarrier_cmd

impl Eq for membarrier_cmd_flag

Trait Eq

§How can I implement `Eq`?