avail_rust_client::ext::scale_info::prelude::cmp

Trait Eq

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.

Eq

Trait Eq Copy item path

§Derivable

§How can I implement Eq?

Dyn Compatibility§

Implementors§

impl Eq for avail_rust_client::MultiAddress

impl Eq for BlockState

impl Eq for FromHexError

impl Eq for avail_rust_client::ext::primitive_types::Error

impl Eq for avail_rust_client::ext::subxt_core::alloc::collections::TryReserveErrorKind

impl Eq for avail_rust_client::ext::subxt_core::alloc::slice::GetDisjointMutError

impl Eq for SearchStep

impl Eq for PolkadotConfig

impl Eq for SubstrateConfig

impl Eq for DigestItem

impl Eq for avail_rust_client::ext::subxt_core::config::substrate::NumberOrHex

impl Eq for Phase

impl Eq for BitsOrderFormat

impl Eq for BitsStoreFormat

impl Eq for avail_rust_client::ext::subxt_core::ext::scale_decode::ext::scale_type_resolver::Primitive

impl Eq for UnhandledKind

impl Eq for avail_rust_client::ext::subxt_core::ext::scale_decode::ext::scale_type_resolver::portable_registry::Error

impl Eq for avail_rust_client::ext::subxt_core::ext::scale_decode::visitor::DecodeError

impl Eq for Unexpected

impl Eq for avail_rust_client::ext::subxt_core::ext::scale_encode::error::Kind

impl Eq for avail_rust_client::ext::subxt_core::ext::scale_value::Primitive

impl Eq for TransactionVersion

impl Eq for avail_rust_client::ext::subxt_core::utils::bits::Lsb0

impl Eq for avail_rust_client::ext::subxt_core::utils::bits::Msb0

impl Eq for Era

impl Eq for avail_rust_client::ext::subxt_core::utils::MultiSignature

impl Eq for ArchiveCallResult

impl Eq for MethodResponse

impl Eq for RuntimeEvent

impl Eq for StorageQueryType

impl Eq for StorageResultType

impl Eq for avail_rust_client::ext::subxt_rpcs::methods::legacy::NumberOrHex

impl Eq for AsciiChar

impl Eq for Infallible

impl Eq for FromBytesWithNulError

impl Eq for AtomicOrdering

impl Eq for avail_rust_client::ext::subxt_signer::bip39::core::net::IpAddr

impl Eq for Ipv6MulticastScope

impl Eq for SocketAddr

impl Eq for avail_rust_client::ext::subxt_signer::bip39::Error

impl Eq for avail_rust_client::ext::subxt_signer::bip39::Language

impl Eq for DeriveJunction

impl Eq for PathError

impl Eq for TypeDefPrimitive

impl Eq for MetaForm

impl Eq for PortableForm

impl Eq for avail_rust_client::ext::scale_info::prelude::fmt::Alignment

impl Eq for DebugAsHex

impl Eq for Sign

impl Eq for FpCategory

impl Eq for IntErrorKind

impl Eq for avail_rust_client::ext::scale_info::prelude::cmp::Ordering

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

impl Eq for BacktraceStatus

impl Eq for VarError

impl Eq for 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 avail_rust_core::types::substrate::MultiSignature

impl Eq for RuntimePhase

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 base64ct::errors::Error

impl Eq for LineEnding

impl Eq for byte_slice_cast::Error

impl Eq for byteorder::BigEndian

impl Eq for byteorder::LittleEndian

Trait Eq

§How can I implement `Eq`?