VoidType class Null safety

The special type void is used to indicate that the value of an expression is meaningless, and intended to be discarded.

Implemented types

Constructors

VoidType()

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.
read-only, inherited
aliasArguments List<DartType>?
If this type is an instantiation of a type alias, return the type arguments used for the instantiation. Otherwise return null.
@Deprecated('Use alias instead'), read-only, inherited
aliasElement TypeAliasElement?
If this type is an instantiation of a type alias, return it. Otherwise return null.
@Deprecated('Use alias instead'), read-only, inherited
displayName String
Return the name of this type as it should appear when presented to users in contexts such as error messages. [...]
@Deprecated('Use getDisplayString instead'), read-only, inherited
element Element?
Return the element representing the declaration of this type, or null if the type has not, or cannot, be associated with an element. The former case will occur if the element model is not yet complete; the latter case will occur if this object represents an undefined type.
read-only, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
isBottom bool
Return true if this type represents the bottom type.
read-only, inherited
isDartAsyncFuture bool
Return true if this type represents the type 'Future' defined in the dart:async library.
read-only, inherited
isDartAsyncFutureOr bool
Return true if this type represents the type 'FutureOr
read-only, inherited
isDartCoreBool bool
Return true if this type represents the type 'bool' defined in the dart:core library.
read-only, inherited
isDartCoreDouble bool
Return true if this type represents the type 'double' defined in the dart:core library.
read-only, inherited
isDartCoreFunction bool
Return true if this type represents the type 'Function' defined in the dart:core library.
read-only, inherited
isDartCoreInt bool
Return true if this type represents the type 'int' defined in the dart:core library.
read-only, inherited
isDartCoreIterable bool
Returns true if this type represents the type 'Iterable' defined in the dart:core library.
read-only, inherited
isDartCoreList bool
Returns true if this type represents the type 'List' defined in the dart:core library.
read-only, inherited
isDartCoreMap bool
Returns true if this type represents the type 'Map' defined in the dart:core library.
read-only, inherited
isDartCoreNull bool
Return true if this type represents the type 'Null' defined in the dart:core library.
read-only, inherited
isDartCoreNum bool
Return true if this type represents the type 'num' defined in the dart:core library.
read-only, inherited
isDartCoreObject bool
Return true if this type represents the type Object defined in the dart:core library.
read-only, inherited
isDartCoreSet bool
Returns true if this type represents the type 'Set' defined in the dart:core library.
read-only, inherited
isDartCoreString bool
Return true if this type represents the type 'String' defined in the dart:core library.
read-only, inherited
isDartCoreSymbol bool
Returns true if this type represents the type 'Symbol' defined in the dart:core library.
read-only, inherited
isDynamic bool
Return true if this type represents the type 'dynamic'.
read-only, inherited
isVoid bool
Return true if this type represents the type 'void'.
read-only, inherited
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.
@Deprecated('Check element, or use getDisplayString()'), read-only, inherited
nullabilitySuffix NullabilitySuffix
Return the nullability suffix of this type.
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

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(ClassElement element) InterfaceType?
Return the canonical interface that this type implements for element, or null if such an interface does not exist. [...]
inherited
getDisplayString({required bool withNullability}) String
Return the presentation of this type as it should appear when presented to users in contexts such as error messages. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
resolveToBound(DartType objectType) DartType
If this type is a TypeParameterType, returns its bound if it has one, or objectType otherwise. [...]
inherited
toString() String
A string representation of this object. [...]
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited