wyal.lang

Class WyalFile.Type.Void

java.lang.Object

wybs.lang.SyntacticElement.Impl

wybs.util.AbstractSyntacticItem

wyal.lang.WyalFile.Type.Atom

wyal.lang.WyalFile.Type.Void

All Implemented Interfaces:

Cloneable, Comparable<wybs.lang.SyntacticItem>, WyalFile.Type, WyalFile.Type.Primitive, wybs.lang.SyntacticElement, wybs.lang.SyntacticItem

Enclosing interface:

WyalFile.Type

public static class WyalFile.Type.Void
extends WyalFile.Type.Atom
implements WyalFile.Type.Primitive

A void type represents the type whose variables cannot exist! That is, they cannot hold any possible value. Void is used to represent the return type of a function which does not return anything. However, it is also used to represent the element type of an empty list of set. NOTE: the void type is a subtype of everything; that is, it is bottom in the type lattice.

Author:

David J. Pearce

Nested Class Summary

Nested classes/interfaces inherited from interface wyal.lang.WyalFile.Type

WyalFile.Type.Any, WyalFile.Type.Array, WyalFile.Type.Atom, WyalFile.Type.Bool, WyalFile.Type.Byte, WyalFile.Type.Function, WyalFile.Type.FunctionOrMacroOrInvariant, WyalFile.Type.FunctionOrMethodOrProperty, WyalFile.Type.Int, WyalFile.Type.Intersection, WyalFile.Type.Invariant, WyalFile.Type.Method, WyalFile.Type.Negation, WyalFile.Type.Nominal, WyalFile.Type.Null, WyalFile.Type.Primitive, WyalFile.Type.Property, WyalFile.Type.Record, WyalFile.Type.Reference, WyalFile.Type.Union, WyalFile.Type.UnionOrIntersection, WyalFile.Type.Void

Nested classes/interfaces inherited from interface wybs.lang.SyntacticItem

wybs.lang.SyntacticItem.Data, wybs.lang.SyntacticItem.Operands, wybs.lang.SyntacticItem.Schema

Nested classes/interfaces inherited from interface wybs.lang.SyntacticElement

wybs.lang.SyntacticElement.Impl

Field Summary

Fields inherited from class wybs.util.AbstractSyntacticItem

data, opcode, operands

Fields inherited from interface wyal.lang.WyalFile.Type

Any, Bool, Int, Null, Void

Constructor Summary

Constructors

Constructor and Description
Void()

Method Summary

Modifier and Type	Method and Description
WyalFile.Type.Void	clone(wybs.lang.SyntacticItem[] operands)
String	toString()

Methods inherited from class wybs.util.AbstractSyntacticItem

allocate, compareTo, equals, get, getAll, getAncestor, getData, getHeap, getIndex, getOpcode, getParent, hashCode, match, setOpcode, setOperand, size, toArray

Methods inherited from class wybs.lang.SyntacticElement.Impl

attribute, attributes

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface wybs.lang.SyntacticItem

allocate, get, getAll, getData, getHeap, getIndex, getOpcode, getParent, setOpcode, setOperand, size

Methods inherited from interface wybs.lang.SyntacticElement

attribute, attributes

Methods inherited from interface java.lang.Comparable

compareTo

Constructor Detail

Void

public Void()

Method Detail

clone

public WyalFile.Type.Void clone(wybs.lang.SyntacticItem[] operands)

Specified by:

clone in interface wybs.lang.SyntacticItem

toString

public String toString()

Overrides:

toString in class wybs.util.AbstractSyntacticItem