Trait frame_support::dispatch::marker::StructuralPartialEq

source ·

pub trait StructuralPartialEq { }

🔬This is a nightly-only experimental API. (structural_match)

Expand description

Required trait for constants used in pattern matches.

Any type that derives PartialEq automatically implements this trait, regardless of whether its type-parameters implement Eq.

If a const item contains some type that does not implement this trait, then that type either (1.) does not implement PartialEq (which means the constant will not provide that comparison method, which code generation assumes is available), or (2.) it implements its own version of PartialEq (which we assume does not conform to a structural-equality comparison).

In either of the two scenarios above, we reject usage of such a constant in a pattern match.

See also the structural match RFC, and issue 63438 which motivated migrating from attribute-based design to this trait.

Trait frame_support::dispatch::marker::StructuralPartialEq

Implementors§

impl StructuralPartialEq for aho_corasick::ahocorasick::MatchKind

impl StructuralPartialEq for aho_corasick::packed::api::MatchKind

impl StructuralPartialEq for Colour

impl StructuralPartialEq for array_bytes::Error

impl StructuralPartialEq for PrintFmt

impl StructuralPartialEq for base16ct::error::Error

impl StructuralPartialEq for FromBase58Error

impl StructuralPartialEq for DecodeError

impl StructuralPartialEq for Language

impl StructuralPartialEq for byte_slice_cast::Error

impl StructuralPartialEq for byteorder::BigEndian

impl StructuralPartialEq for byteorder::LittleEndian

impl StructuralPartialEq for SecondsFormat

impl StructuralPartialEq for Fixed

impl StructuralPartialEq for Numeric

impl StructuralPartialEq for Pad

impl StructuralPartialEq for ParseErrorKind

impl StructuralPartialEq for Month

impl StructuralPartialEq for RoundingError

impl StructuralPartialEq for Weekday

impl StructuralPartialEq for const_oid::error::Error

impl StructuralPartialEq for CFComparisonResult

impl StructuralPartialEq for ArrayType

impl StructuralPartialEq for BaseUnresolvedName

impl StructuralPartialEq for BuiltinType

impl StructuralPartialEq for CallOffset

impl StructuralPartialEq for ClassEnumType

impl StructuralPartialEq for CtorDtorName

impl StructuralPartialEq for Decltype

impl StructuralPartialEq for DestructorName

impl StructuralPartialEq for cpp_demangle::ast::Encoding

impl StructuralPartialEq for ExprPrimary

impl StructuralPartialEq for cpp_demangle::ast::Expression

impl StructuralPartialEq for GlobalCtorDtor

impl StructuralPartialEq for LocalName

impl StructuralPartialEq for MangledName

impl StructuralPartialEq for Name

impl StructuralPartialEq for NestedName

impl StructuralPartialEq for OperatorName

impl StructuralPartialEq for cpp_demangle::ast::Prefix

impl StructuralPartialEq for PrefixHandle

impl StructuralPartialEq for RefQualifier

impl StructuralPartialEq for SimpleOperatorName

impl StructuralPartialEq for SpecialName

impl StructuralPartialEq for StandardBuiltinType

impl StructuralPartialEq for Substitution

impl StructuralPartialEq for TemplateArg

impl StructuralPartialEq for TemplateTemplateParamHandle

impl StructuralPartialEq for cpp_demangle::ast::Type

impl StructuralPartialEq for TypeHandle

impl StructuralPartialEq for UnqualifiedName

impl StructuralPartialEq for UnresolvedName

impl StructuralPartialEq for UnresolvedType

impl StructuralPartialEq for UnresolvedTypeHandle

impl StructuralPartialEq for UnscopedName

impl StructuralPartialEq for UnscopedTemplateNameHandle

impl StructuralPartialEq for VectorType

impl StructuralPartialEq for WellKnownComponent

impl StructuralPartialEq for DemangleNodeType

impl StructuralPartialEq for cpp_demangle::error::Error

impl StructuralPartialEq for Reloc

impl StructuralPartialEq for CursorPosition

impl StructuralPartialEq for DataValueCastFailure

impl StructuralPartialEq for AtomicRmwOp

impl StructuralPartialEq for FloatCC

impl StructuralPartialEq for IntCC

impl StructuralPartialEq for ValueDef

impl StructuralPartialEq for AnyEntity

impl StructuralPartialEq for ValueLabelAssignments

impl StructuralPartialEq for ArgumentExtension

impl StructuralPartialEq for ArgumentPurpose

impl StructuralPartialEq for ExternalName

impl StructuralPartialEq for UserFuncName

impl StructuralPartialEq for GlobalValueData

impl StructuralPartialEq for HeapStyle

impl StructuralPartialEq for InstructionData

impl StructuralPartialEq for InstructionFormat

impl StructuralPartialEq for Opcode