Trait scrypto::prelude::Eq

1.0.0 · source ·

pub trait Eq: PartialEq { }

Expand description

Trait for comparisons corresponding to equivalence relations.

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

reflexive: a == a;
symmetric: a == b implies b == a (required by PartialEq as well); and
transitive: a == b and b == c implies a == c (required by PartialEq as well).

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

Implement Eq in addition to PartialEq if it’s guaranteed that PartialEq::eq(a, a) always returns true (reflexivity), in addition to the symmetric and transitive properties already required by PartialEq.

§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 {}

Object Safety§

This trait is not object safe.

Trait scrypto::prelude::Eq

§Derivable

§How can I implement Eq?

Object Safety§

Implementors§

impl Eq for AddressBech32DecodeError

impl Eq for AddressBech32EncodeError

impl Eq for AttachedModuleId

impl Eq for KeyValueStoreDataSchema

impl Eq for ModuleId

impl Eq for FallToOwner

impl Eq for MetadataConversionError

impl Eq for Proposer

impl Eq for Role

impl Eq for DefaultDepositRule

impl Eq for ResourcePreference

impl Eq for TimePrecisionV1

impl Eq for TimePrecisionV2

impl Eq for BlueprintPartitionType

impl Eq for BlueprintPayloadDef

impl Eq for BlueprintPayloadIdentifier

impl Eq for BlueprintType

impl Eq for FunctionAuth

impl Eq for InputOrOutput

impl Eq for KeyOrValue

impl Eq for MethodAuthTemplate

impl Eq for PartitionDescription

impl Eq for RoleSpecification

impl Eq for SystemInstruction

impl Eq for VmType

impl Eq for AccessRule

impl Eq for AccessRuleNode

impl Eq for GlobalCaller

impl Eq for MethodAccessibility

impl Eq for NonFungibleDataSchema

impl Eq for OwnerRole

impl Eq for OwnerRoleUpdater

impl Eq for ParseNonFungibleGlobalIdError

impl Eq for ProofRule

impl Eq for ResourceError

impl Eq for ResourceFeature

impl Eq for ResourceOrNonFungible

impl Eq for ResourceType

impl Eq for WithdrawStrategy

impl Eq for InstructionOutput

impl Eq for ComponentCastError

impl Eq for ObjectStubHandle

impl Eq for ParseBlsPublicKeyError

impl Eq for ParseBlsSignatureError

impl Eq for ParseEd25519PublicKeyError

impl Eq for ParseEd25519SignatureError

impl Eq for ParseHashError

impl Eq for ParseSecp256k1PublicKeyError

impl Eq for ParseSecp256k1SignatureError

impl Eq for scrypto::crypto::PublicKey

impl Eq for PublicKeyHash

impl Eq for ManifestCustomExtension

impl Eq for ManifestCustomTraversal

impl Eq for ManifestCustomValue

impl Eq for ManifestCustomValueKind

impl Eq for ManifestToRustValueError

impl Eq for RustToManifestValueError

impl Eq for ManifestAddress

impl Eq for ManifestExpression

impl Eq for ManifestNonFungibleLocalId

impl Eq for ManifestNonFungibleLocalIdValidationError

impl Eq for ParseManifestAddressReservationError

impl Eq for ParseManifestBlobRefError

impl Eq for ParseManifestBucketError

impl Eq for ParseManifestDecimalError

impl Eq for ParseManifestExpressionError

impl Eq for ParseManifestPreciseDecimalError

impl Eq for ParseManifestProofError

impl Eq for OwnValidation

impl Eq for ReferenceValidation

impl Eq for ScryptoCustomTraversal

impl Eq for ScryptoCustomTypeKind

impl Eq for ScryptoCustomTypeValidation

impl Eq for ScryptoCustomValue

impl Eq for ScryptoCustomValueKind

§How can I implement `Eq`?