trait Expr[S <: Sys[S], +A] extends Obj[S] with Publisher[S, Change[A]]

An expression is a computation that reduces to a single value of type A. Expressions can be understood as dataflow variables. When a tree is composed, a change in the root of the tree propagates through to the leaves in the form of an emitted Change event that carries the old and new value (according to the particular node of the tree).

Basic expression types are Expr.Const - it simply wraps a constant value and thus will never change or fire an event - and Expr.Var which can be thought of as a mutable variable carrying a peer expression. When the variable assignment changes, the expression currently held is evaluated and propagated as an event. Intermediate nodes or expressions might modify the value, such as a binary operator (e.g., an integer expression that sums two input integer expressions).

Linear Supertypes
Obj[S], Mutable[S.ID, S.Tx], Identifiable[S.ID], Elem[S], Publisher[S, Change[A]], Disposable[S.Tx], Writable, AnyRef, Any
Known Subclasses
Artifact, Modifiable, ArtifactLocation, Tuple1, Tuple2, BooleanObj, Tuple1, Tuple2, DoubleObj, DoubleVector, Const, Var, Tuple1, Tuple2, IntObj, Tuple1, Tuple2, LongObj, Tuple2, Tuple1, Tuple2, SpanLikeObj, SpanObj, Tuple2, StringObj, ConstImpl, ConstImpl, VarImpl, NodeImpl, Tuple1, Tuple2, VarImpl
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Inherited
  1. Expr
  2. Obj
  3. Mutable
  4. Identifiable
  5. Elem
  6. Publisher
  7. Disposable
  8. Writable
  9. AnyRef
  10. Any
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Visibility
  1. Public
  2. All

Abstract Value Members

  1. abstract def changed: EventLike[S, Change[A]]
    Definition Classes
    Publisher
  2. abstract def dispose()(implicit tx: S.Tx): Unit
    Definition Classes
    Disposable
  3. abstract def id: S.ID
    Definition Classes
    Identifiable
  4. abstract def tpe: Type
    Definition Classes
    Obj → Elem
  5. abstract def value(implicit tx: S.Tx): A
  6. abstract def write(out: DataOutput): Unit
    Definition Classes
    Writable

Concrete Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##(): Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. final def attr(implicit tx: S.Tx): AttrMap[S]
    Definition Classes
    Obj
  6. def clone(): AnyRef
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  7. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  8. def equals(that: Any): Boolean
    Definition Classes
    Identifiable → AnyRef → Any
  9. def finalize(): Unit
    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )
  10. final def getClass(): Class[_]
    Definition Classes
    AnyRef → Any
  11. def hashCode(): Int
    Definition Classes
    Identifiable → AnyRef → Any
  12. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  14. final def notify(): Unit
    Definition Classes
    AnyRef
  15. final def notifyAll(): Unit
    Definition Classes
    AnyRef
  16. final def synchronized[T0](arg0: ⇒ T0): T0
    Definition Classes
    AnyRef
  17. def toString(): String
    Definition Classes
    Obj → AnyRef → Any
  18. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  19. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  20. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from Obj[S]

Inherited from Mutable[S.ID, S.Tx]

Inherited from Identifiable[S.ID]

Inherited from Elem[S]

Inherited from Publisher[S, Change[A]]

Inherited from Disposable[S.Tx]

Inherited from Writable

Inherited from AnyRef

Inherited from Any

Ungrouped