Trait wasmtime_environ::__core::prelude::rust_2018::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 wasmtime_environ::__core::prelude::rust_2018::Eq

Derivable

How can I implement Eq?

Implementors§

impl Eq for EntityIndex

impl Eq for FlagValue

impl Eq for GlobalInit

impl Eq for Trap

impl Eq for WasmType

impl Eq for BlockType

impl Eq for CanonicalOption

impl Eq for ComponentExternalKind

impl Eq for ComponentOuterAliasKind

impl Eq for ComponentTypeRef

impl Eq for ComponentValType

impl Eq for wasmtime_environ::wasmparser::Encoding

impl Eq for ExternalKind

impl Eq for FrameKind

impl Eq for InstantiationArgKind

impl Eq for OuterAliasKind

impl Eq for PrimitiveValType

impl Eq for TypeBounds

impl Eq for ValType

impl Eq for wasmtime_environ::__core::cmp::Ordering

impl Eq for Infallible

impl Eq for wasmtime_environ::__core::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 wasmtime_environ::__core::sync::atomic::Ordering

impl Eq for TryReserveErrorKind

impl Eq for BacktraceStatus

impl Eq for VarError

impl Eq for SeekFrom

impl Eq for ErrorKind

impl Eq for Shutdown

impl Eq for BacktraceStyle

impl Eq for RecvTimeoutError

impl Eq for TryRecvError

impl Eq for DwarfFileType

impl Eq for Format

impl Eq for gimli::common::SectionId

impl Eq for RunTimeEndian

impl Eq for Pointer

impl Eq for gimli::read::Error

impl Eq for ColumnType

impl Eq for ValueType

impl Eq for log::Level

impl Eq for LevelFilter

impl Eq for AddressSize

impl Eq for object::common::Architecture

impl Eq for object::common::BinaryFormat

impl Eq for ComdatKind

impl Eq for FileFlags

impl Eq for RelocationEncoding

impl Eq for RelocationKind

impl Eq for SectionFlags

impl Eq for SectionKind

impl Eq for SegmentFlags

impl Eq for SymbolKind

impl Eq for SymbolScope

impl Eq for object::endian::Endianness

impl Eq for CompressionFormat

impl Eq for FileKind

impl Eq for ObjectKind

impl Eq for RelocationTarget

impl Eq for object::read::SymbolSection

impl Eq for Mangling

impl Eq for StandardSection

impl Eq for StandardSegment

impl Eq for object::write::SymbolSection

impl Eq for CDataModel

impl Eq for Size

impl Eq for target_lexicon::parse_error::ParseError

impl Eq for Aarch64Architecture

impl Eq for target_lexicon::targets::Architecture

How can I implement `Eq`?