U8Type class final

8-bit unsigned integer type (0 to 255).

Represents unsigned 8-bit integers for smart contracts. Range: 0 to 255, encoded as single byte with no sign bit.

Example

final byte1 = U8Type.create(100);
final byte2 = U8Type.create(255); // Max value
final zero = U8Type.create(0);

print(byte1.nativeValue); // 100
print(byte2.toBytes()); // [255]
print(zero.toBytes()); // [0]

// Use in struct definitions
final structType = StructType(
  name: 'Counter',
  fieldDefinitions: [
    FieldDefinition(name: 'count', type: U8Type.type),
  ],
);

Inheritance

Available extensions

Annotations

@immutable

Properties

cardinality → TypeCardinality: Type cardinality.
finalinherited
classHierarchy → List<String>: Returns full class hierarchy from most specific to most general.
no setteroverride
className → String: Returns class name for runtime type identification.
no setteroverride
firstTypeParameter → AbiType: Gets first type parameter.
no setterinherited
fullyQualifiedName → String: Returns fully qualified name including type parameters.
no setterinherited
hashCode → int: The hash code for this object.
no setterinherited
hasMetadata → bool: Whether type has metadata attached.
no setterinherited
isDynamic → bool: Whether type has dynamic (variable) length.
no setterinherited
isDynamic → bool: Available on AbiType, provided by the AbiTypeExtensions extension
Returns whether the type has dynamic length.
no setter
isGeneric → bool: Whether type is generic (has type parameters).
no setterinherited
isSigned → bool: Whether this type represents signed integers.
finalinherited
metadata → dynamic: Optional metadata.
finalinherited
name → String: Type name (e.g., 'u32', 'Address', 'List').
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
sizeInBytes → int?: Returns byte size if fixed, null if dynamic.
finalinherited
typeParameters → List<AbiType>: Type parameters for generic types.
finalinherited

Methods

canAcceptValue(dynamic nativeValue) → bool: Checks if type can accept the given native value.
inherited
createValue(dynamic nativeValue) → U8Value: Creates typed value from native Dart value.
override
createValueOrThrow<T extends TypedValue>(dynamic nativeValue) → T: Available on AbiType, provided by the AbiTypeOrThrowExtensions extension
Creates a TypedValue from native value and ensures it matches expected type.
equals(AbiType other) → bool: Checks type equality based on fully qualified names.
inherited
hasClassOrSuperclass(String name) → bool: Checks if instance is or extends the specified class.
inherited
hasExactClass(String name) → bool: Checks if instance is exactly the specified class.
inherited
isAssignableFrom(AbiType other) → bool: Checks if type can be assigned from other type.
inherited
isValidValue(dynamic value) → bool: Available on AbiType, provided by the AbiTypeExtensions extension
Checks if the value is valid for this type.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
requireType<T extends AbiType>(String message) → T: Available on AbiType, provided by the AbiTypeValidationExtensions extension
Ensures this type is an instance of T, throwing with a custom message if not.
toMap() → Map<String, dynamic>: inherited
toString() → String: A string representation of this object.
inherited

Operators

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

Static Properties

type → U8Type: Gets the singleton type instance for use in type definitions.
no setter

Static Methods

create(dynamic nativeValue) → U8Value: Creates a U8Value from native Dart int.