FunctionType class abstract

The type of a function, method, constructor, getter, or setter. Function types come in three variations:

  • The types of functions that only have required parameters. These have the general form (T1, …, Tn) → T.
  • The types of functions with optional positional parameters. These have the general form (T1, …, Tn, T<sub>n+1</sub> &hellip;, T<sub>n+k</sub>) → T.
  • The types of functions with named parameters. These have the general form (T1, …, Tn, {Tx1 x1, …, Txk xk}) → T.

Clients may not extend, implement or mix-in this class.

Implemented types

Constructors

FunctionType()

Properties

alias → InstantiatedTypeAliasElement?
If this type is an instantiation of a type alias, information about the alias element, and the type arguments. Otherwise return null.
no setterinherited
element → Null
Return the element representing the declaration of this type, or null if the type is not associated with an element.
no setteroverride
element3 → Element2?
Return the element representing the declaration of this type, or null if the type is not associated with an element.
no setterinherited
extensionTypeErasure → DartType
The extension type erasure of this type.
no setterinherited
formalParameters → List<FormalParameterElement>
The formal parameters.
no setter
hashCode → int
The hash code for this object.
no setterinherited
isBottom → bool
Return true if this type represents the bottom type.
no setterinherited
isDartAsyncFuture → bool
Return true if this type represents the type 'Future' defined in the dart:async library.
no setterinherited
isDartAsyncFutureOr → bool
Return true if this type represents the type FutureOr<T> defined in the dart:async library.
no setterinherited
isDartAsyncStream → bool
Return true if this type represents the type 'Stream' defined in the dart:async library.
no setterinherited
isDartCoreBool → bool
Return true if this type represents the type 'bool' defined in the dart:core library.
no setterinherited
isDartCoreDouble → bool
Return true if this type represents the type 'double' defined in the dart:core library.
no setterinherited
isDartCoreEnum → bool
Return true if this type represents the type 'Enum' defined in the dart:core library.
no setterinherited
isDartCoreFunction → bool
Return true if this type represents the type 'Function' defined in the dart:core library.
no setterinherited
isDartCoreInt → bool
Return true if this type represents the type 'int' defined in the dart:core library.
no setterinherited
isDartCoreIterable → bool
Returns true if this type represents the type 'Iterable' defined in the dart:core library.
no setterinherited
isDartCoreList → bool
Returns true if this type represents the type 'List' defined in the dart:core library.
no setterinherited
isDartCoreMap → bool
Returns true if this type represents the type 'Map' defined in the dart:core library.
no setterinherited
isDartCoreNull → bool
Return true if this type represents the type 'Null' defined in the dart:core library.
no setterinherited
isDartCoreNum → bool
Return true if this type represents the type 'num' defined in the dart:core library.
no setterinherited
isDartCoreObject → bool
Return true if this type represents the type Object defined in the dart:core library.
no setterinherited
isDartCoreRecord → bool
Return true if this type represents the type 'Record' defined in the dart:core library.
no setterinherited
isDartCoreSet → bool
Returns true if this type represents the type 'Set' defined in the dart:core library.
no setterinherited
isDartCoreString → bool
Return true if this type represents the type 'String' defined in the dart:core library.
no setterinherited
isDartCoreSymbol → bool
Returns true if this type represents the type 'Symbol' defined in the dart:core library.
no setterinherited
isDartCoreType → bool
Return true if this type represents the type 'Type' defined in the dart:core library.
no setterinherited
name → String?
Return the name of this type, or null if the type does not have a name, such as when the type represents the type of an unnamed function.
no setterinherited
namedParameterTypes → Map<String, DartType>
A map from the names of named parameters to the types of the named parameters of this type of function.
no setter
normalParameterTypes → List<DartType>
A list containing the types of the normal parameters of this type of function.
no setter
nullabilitySuffix → NullabilitySuffix
If this type ends in a suffix (? or *), the suffix it ends with; otherwise NullabilitySuffix.none.
no setterinherited
optionalParameterTypes → List<DartType>
A map from the names of optional (positional) parameters to the types of the optional parameters of this type of function.
no setter
parameters → List<ParameterElement>
A list containing the parameters elements of this type of function.
no setter
positionalParameterTypes → List<DartType>
All the positional parameter types, starting with the required ones, and followed by the optional ones.
no setterinherited
requiredPositionalParameterCount → int
The number of elements of positionalParameterTypes that are required parameters.
no setterinherited
returnType → DartType
The type of object returned by this type of function.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
sortedNamedParameters → List<ParameterElement>
All the named parameters, sorted by name.
no setterinherited
typeFormals → List<TypeParameterElement>
The formal type parameters of this generic function; for example, <T> T -> T.
no setter
typeParameters → List<TypeParameterElement2>
The type parameters.
no setter

Methods

accept<R>(TypeVisitor<R> visitor) → R
Use the given visitor to visit this type.
inherited
acceptWithArgument<R, A>(TypeVisitorWithArgument<R, A> visitor, A argument) → R
Use the given visitor to visit this type.
inherited
asInstanceOf(InterfaceElement element) → InterfaceType?
Return the canonical interface that this type implements for element, or null if such an interface does not exist.
inherited
asInstanceOf2(InterfaceElement2 element) → InterfaceType?
Return the canonical interface that this type implements for element, or null if such an interface does not exist.
inherited
getDisplayString({bool withNullability = true}) → String
Return the presentation of this type as it should appear when presented to users in contexts such as error messages.
inherited
instantiate(List<DartType> argumentTypes) → FunctionType
Produces a new function type by substituting type parameters of this function type with the given argumentTypes.
isStructurallyEqualTo(SharedTypeStructure<DartType> other) → bool
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited