DataType<T> class abstract

Descriptor of a data type T, how it is efficiently represented and stored in memory, and strategy of how common operations work.

Implementers
Annotations
  • @immutable

Constructors

DataType()
Abstract const constructor.
const

Properties

defaultValue → T
Returns the default value, typically equivalent to the zero or null value.
no setter
equality → Equality<T>
Returns an equality relation.
no setter
field → Field<T>
Returns a mathematical field, if available.
no setter
hashCode → int
The hash code for this object.
no setterinherited
isNullable → bool
Returns true, if this DataType supports null values.
no setter
name → String
Returns the name of this DataType.
no setter
nullable → DataType<T?>
Returns a DataType that supports null values.
no setter
printer → Printer<T>
Returns a default printer for this data type.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited

Methods

cast(dynamic value) → T
Casts the argument to this data type, otherwise throw an ArgumentError.
castList(Iterable<Object?> elements) → List<T>
Casts an existing iterable to this data type.
comparator(T a, T b) → int
Returns a Comparator that compares one element to another.
copyList(Iterable<T> iterable, {int? length, T? fillValue, bool readonly = false}) → List<T>
Creates a fixed-length list copy of the iterable, possibly with a modified length and if necessary populated with fillValue.
newList(int length, {Map1<int, T>? generate, T? fillValue, bool readonly = false}) → List<T>
Creates a fixed-length list of this data type.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
override

Operators

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

Static Properties

float ↔ FloatDataType<List<double>>
Configurable default data type for floating point arithmetic.
getter/setter pair
index ↔ IntegerDataType<List<int>>
Configurable default data type to index collections, rows, columns, etc.
getter/setter pair
integer ↔ IntegerDataType<List<int>>
Configurable default data type for integer arithmetic.
getter/setter pair

Static Methods

fromInstance<T>(T instance) → DataType<T>
Derives a fitting DataType from instance.
fromIterable<T>(Iterable<T> iterable) → DataType<T>
Derives a fitting DataType from an iterable.
fromType<T>() → DataType<T>
Derives a fitting DataType from T.
modulo<T>(DataType<T> delegate, T modulus) → ModuloDataType<T>
Return an modulo data type.
nullableObject<T>([T? defaultValue]) → ObjectDataType<T?>
Return a nullable object type T with the optional defaultValue.
object<T>(T defaultValue) → ObjectDataType<T>
Return an object type T with the given defaultValue.

Constants

bigInt → const BigIntDataType
BigInt object data type.
boolean → const BooleanDataType
bool object data type.
complex → const ComplexDataType
Complex object data type.
dynamicType → const DynamicDataType
Dynamic object type that can hold any Object or null.
float32 → const FloatDataType<List<double>>
32-bit double data type.
float64 → const FloatDataType<List<double>>
64-bit double data type.
fraction → const FractionDataType
Fraction object data type.
int8 → const IntegerDataType<List<int>>
Signed 8-bit int data type.
int16 → const IntegerDataType<List<int>>
Signed 16-bit int data type.
int32 → const IntegerDataType<List<int>>
Signed 32-bit int data type.
int64 → const IntegerDataType<List<int>>
Signed 64-bit int data type.
numeric → const NumericDataType
num object data type.
quaternion → const QuaternionDataType
Quaternion object data type.
string → const StringDataType
String object data type.
uint8 → const IntegerDataType<List<int>>
Unsigned 8-bit int data type.
uint16 → const IntegerDataType<List<int>>
Unsigned 16-bit int data type.
uint32 → const IntegerDataType<List<int>>
Unsigned 32-bit int data type.
uint64 → const IntegerDataType<List<int>>
Unsigned 64-bit int data type.