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DualExistentialContainer
tevelee edited this page Jul 21, 2026
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An existential container is a type in Swift that contains some struct or class with information of what the type it's containing is, and the witness tables needed that the existential (protocol) is. Dual supports an existential that is composed of two protocols. E.g. X & Y
public struct DualExistentialContainer ABI Stability: Stable since the following
| macOS | iOS/tvOS | watchOS | Linux | Windows |
|-------|----------|---------|-------|---------|
| 10.14 | 12.2 | 5.2 | NA | NA |
The base any existential, also known as Any.
public var base: AnyExistentialContainerA pointer to witness tables.
public var witnessTables: (WitnessTable, WitnessTable)Generated at 2026-07-27T11:49:06+0000 using swift-doc 1.0.0-rc.1.
Types
- AccessibleFunction
- AccessibleFunctionFlags
- AnonymousDescriptor
- AnonymousDescriptor.Flags
- AnyExistentialContainer
- AsyncContinuationFlags
- BoxPair
- ClassDescriptor
- ClassMetadata
- ClassMetadata.Flags
- ConformanceDescriptor
- ConformanceDescriptor.Flags
- ContextDescriptorFlags
- ContextDescriptorKind
- ContinuationStatus
- CoroutineAllocator
- CoroutineAllocatorFlags
- CoroutineAllocatorKind
- DefaultOverrideTableHeader
- DualExistentialContainer
- DynamicCastFlags
- DynamicReplacementChainEntry
- DynamicReplacementDescriptor
- DynamicReplacementKey
- DynamicReplacementScope
- EnumDescriptor
- EnumMetadata
- EnumValueWitnessTable
- ExistentialContainer
- ExistentialMetadata
- ExistentialMetadata.Flags
- ExistentialProtocolReference
- ExistentialProtocolReference.Kind
- ExtendedExistentialMetadata
- ExtendedExistentialTypeShape
- ExtendedExistentialTypeShape.Flags
- ExtendedExistentialTypeShape.SpecialKind
- ExtendedFunctionTypeFlags
- ExtensionDescriptor
- ExtraClassDescriptorFlags
- FieldDescriptor
- FieldDescriptor.Kind
- FieldRecord
- FieldRecord.Flags
- FixedArrayMetadata
- ForeignClassMetadata
- ForeignMetadataInitialization
- ForeignReferenceTypeMetadata
- FunctionConvention
- FunctionMetadata
- FunctionMetadata.DifferentiabilityKind
- FunctionMetadata.Flags
- FunctionMetadata.ParamFlags
- GenericArgument
- GenericClassMetadataPattern
- GenericContext
- GenericContextDescriptorFlags
- GenericEnvironment
- GenericEnvironmentFlags
- GenericMetadataPartialPattern
- GenericMetadataPattern
- GenericMetadataPattern.Flags
- GenericPackKind
- GenericPackShapeDescriptor
- GenericPackShapeHeader
- GenericParameterDescriptor
- GenericParameterKind
- GenericRequirementDescriptor
- GenericRequirementDescriptor.Flags
- GenericRequirementKind
- GenericRequirementLayoutKind
- GenericSignatureHeader
- GenericValueDescriptor
- GenericValueHeader
- GenericValueMetadataPattern
- GenericValueType
- GenericWitnessTable
- GlobalActorReference
- HeapGenericLocalVariableMetadata
- HeapLocalVariableMetadata
- HeapObject
- InvertibleProtocolKind
- InvertibleProtocolSet
- JobFlags
- JobKind
- JobPriority
- KeyPathComponentHeader
- KeyPathComponentHeader.ComputedIdentifierKind
- KeyPathComponentHeader.ComputedIdentifierResolution
- KeyPathComponentHeader.ComputedPropertyKind
- KeyPathComponentHeader.Kind
- KeyPathComponentHeader.OptionalOperation
- KeyPathComponentHeader.StoredOffsetKind
- KnownMetadata
- KnownMetadata.Builtin
- MetadataAccessFunction
- MetadataBounds
- MetadataInitializationKind
- MetadataKind
- MetadataPack
- MetadataRequest
- MetadataResponse
- MetadataState
- MetadataTrailingFlags
- MetatypeMetadata
- MethodDefaultOverrideDescriptor
- MethodDescriptor
- MethodDescriptor.Flags
- MethodDescriptor.Kind
- MethodOverrideDescriptor
- ModuleDescriptor
- NonUniqueExtendedExistentialTypeShape
- ObjCClassWrapperMetadata
- OpaqueDescriptor
- OpaqueMetadata
- OpaqueTypeReplacement
- OverrideTableHeader
- PackLifetime
- ProtocolDescriptor
- ProtocolDescriptor.Flags
- ProtocolDispatchStrategy
- ProtocolRequirement
- ProtocolRequirement.Flags
- ProtocolRequirement.Kind
- ReferenceStorageKind
- RelativeWitnessTable
- ResilientClassMetadataPattern
- ResilientWitness
- SerialExecutorReference
- SerialExecutorReference.Kind
- SingletonMetadataInitialization
- SpecialProtocol
- StructDescriptor
- StructMetadata
- TaskCreateFlags
- TaskExecutorReference
- TaskExecutorReference.Kind
- TaskGroupFlags
- TaskOptionRecordFlags
- TaskOptionRecordKind
- TaskStatusRecordFlags
- TaskStatusRecordKind
- TupleMetadata
- TupleMetadata.Element
- TypeContextDescriptorFlags
- TypeGenericContext
- TypeImportInfo
- TypeReferenceKind
- UnknownMetadata
- VTableDescriptorHeader
- ValueOwnership
- ValueWitnessTable
- ValueWitnessTable.Flags
- WitnessTable
- WitnessTablePack
Global Typealiases
Global Variables
Global Functions
- container(for:)
- findConformance(to:)
- findConformance(toProtocolNamed:)
- lookupSection(_:segment:section:do:)
- reflect(_:)
- reflectClass(_:)
- reflectEnum(_:)
- reflectStruct(_:)
- registerAccessibleFunctions(section:size:)
- registerDynamicReplacementScopes(section:size:)
- registerOpaqueTypeReplacements(section:size:)
- registerProtocolConformances(section:size:)
- registerProtocols(section:size:)
- registerTypeMetadata(section:size:)
- swift_allocBox(for:)
- swift_allocObject(for:size:alignment:)
- swift_conformsToProtocol(metadata:protocol:)
- swift_conformsToProtocol(type:protocol:)
- swift_getTypeName(for:qualified:)
- withProjectedValue(of:_:)
- withProjectedValues(of:_:)