scala.util

# DynamicVariable

#### class DynamicVariable[T] extends AnyRef

`DynamicVariables` provide a binding mechanism where the current value is found through dynamic scope, but where access to the variable itself is resolved through static scope.

The current value can be retrieved with the value method. New values should be pushed using the `withValue` method. Values pushed via `withValue` only stay valid while the `withValue`'s second argument, a parameterless closure, executes. When the second argument finishes, the variable reverts to the previous value.

    someDynamicVariable.withValue(newValue) {
    // ... code called in here that calls value ...
    // ... will be given back the newValue ...
    }

Each thread gets its own stack of bindings. When a new thread is created, the `DynamicVariable` gets a copy of the stack of bindings from the parent thread, and from then on the bindings for the new thread are independent of those for the original thread.

Version

  1.1, 2007-5-21

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Inherited

1. DynamicVariable
2. AnyRef
3. Any

Implicitly

1. by any2stringadd
2. by StringFormat
3. by Ensuring
4. by ArrowAssoc

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### Instance Constructors

1. #### new DynamicVariable(init: T)

### Value Members

1. #### final def !=(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

2. #### final def ##(): Int

   Definition Classes
     AnyRef → Any

3. #### def +(other: String): String

   Implicit information
     This member is added by an implicit conversion from DynamicVariable[T] to any2stringadd[DynamicVariable[T]] performed by method any2stringadd in scala.Predef.
   Definition Classes
     any2stringadd

4. #### def ->[B](y: B): (DynamicVariable[T], B)

   Implicit information
     This member is added by an implicit conversion from DynamicVariable[T] to ArrowAssoc[DynamicVariable[T]] performed by method ArrowAssoc in scala.Predef.
   Definition Classes
     ArrowAssoc
   Annotations
     @inline()

5. #### final def ==(arg0: Any): Boolean

   Definition Classes
     AnyRef → Any

6. #### final def asInstanceOf[T0]: T0

   Definition Classes
     Any

7. #### def clone(): AnyRef

   Attributes
     protected[java.lang]
   Definition Classes
     AnyRef
   Annotations
     @throws( ... )

8. #### def ensuring(cond: (DynamicVariable[T]) ⇒ Boolean, msg: ⇒ Any): DynamicVariable[T]

   Implicit information
     This member is added by an implicit conversion from DynamicVariable[T] to Ensuring[DynamicVariable[T]] performed by method Ensuring in scala.Predef.
   Definition Classes
     Ensuring

9. #### def ensuring(cond: (DynamicVariable[T]) ⇒ Boolean): DynamicVariable[T]

   Implicit information
     This member is added by an implicit conversion from DynamicVariable[T] to Ensuring[DynamicVariable[T]] performed by method Ensuring in scala.Predef.
   Definition Classes
     Ensuring

10. #### def ensuring(cond: Boolean, msg: ⇒ Any): DynamicVariable[T]

    Implicit information
      This member is added by an implicit conversion from DynamicVariable[T] to Ensuring[DynamicVariable[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

11. #### def ensuring(cond: Boolean): DynamicVariable[T]

    Implicit information
      This member is added by an implicit conversion from DynamicVariable[T] to Ensuring[DynamicVariable[T]] performed by method Ensuring in scala.Predef.
    Definition Classes
      Ensuring

12. #### final def eq(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

13. #### def equals(arg0: Any): Boolean

    Definition Classes
      AnyRef → Any

14. #### def finalize(): Unit

    Attributes
      protected[java.lang]
    Definition Classes
      AnyRef
    Annotations
      @throws( classOf[java.lang.Throwable] )

15. #### def formatted(fmtstr: String): String

    Returns string formatted according to given `format` string.

    Returns string formatted according to given `format` string. Format strings are as for `String.format` (@see java.lang.String.format).

    Implicit information
      This member is added by an implicit conversion from DynamicVariable[T] to StringFormat[DynamicVariable[T]] performed by method StringFormat in scala.Predef.
    Definition Classes
      StringFormat
    Annotations
      @inline()

16. #### final def getClass(): Class[_]

    Definition Classes
      AnyRef → Any

17. #### def hashCode(): Int

    Definition Classes
      AnyRef → Any

18. #### final def isInstanceOf[T0]: Boolean

    Definition Classes
      Any

19. #### final def ne(arg0: AnyRef): Boolean

    Definition Classes
      AnyRef

20. #### final def notify(): Unit

    Definition Classes
      AnyRef

21. #### final def notifyAll(): Unit

    Definition Classes
      AnyRef

22. #### final def synchronized[T0](arg0: ⇒ T0): T0

    Definition Classes
      AnyRef

23. #### def toString(): String

    Definition Classes
      DynamicVariable → AnyRef → Any

24. #### def value: T

    Retrieve the current value

25. #### def value_=(newval: T): Unit

    Change the currently bound value, discarding the old value.

    Change the currently bound value, discarding the old value. Usually withValue() gives better semantics.

26. #### final def wait(): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

27. #### final def wait(arg0: Long, arg1: Int): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

28. #### final def wait(arg0: Long): Unit

    Definition Classes
      AnyRef
    Annotations
      @throws( ... )

29. #### def withValue[S](newval: T)(thunk: ⇒ S): S

    Set the value of the variable while executing the specified thunk.

    Set the value of the variable while executing the specified thunk.

    newval

      The value to which to set the variable

    thunk

      The code to evaluate under the new setting

30. #### def →[B](y: B): (DynamicVariable[T], B)

    Implicit information
      This member is added by an implicit conversion from DynamicVariable[T] to ArrowAssoc[DynamicVariable[T]] performed by method ArrowAssoc in scala.Predef.
    Definition Classes
      ArrowAssoc

### Inherited from AnyRef

### Inherited from Any

### Inherited by implicit conversion any2stringadd from DynamicVariable[T] to any2stringadd[DynamicVariable[T]]

### Inherited by implicit conversion StringFormat from DynamicVariable[T] to StringFormat[DynamicVariable[T]]

### Inherited by implicit conversion Ensuring from DynamicVariable[T] to Ensuring[DynamicVariable[T]]

### Inherited by implicit conversion ArrowAssoc from DynamicVariable[T] to ArrowAssoc[DynamicVariable[T]]

### Ungrouped