DynamicVariable

scala.util.DynamicVariable
class DynamicVariable[T](init: T)

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.

Attributes

Source:
DynamicVariable.scala
Graph
Supertypes
class Object
trait Matchable
class Any

Members list

Concise view

Value members

Concrete methods

override def toString: String

Returns a string representation of the object.

Returns a string representation of the object.

The default representation is platform dependent.

Attributes

Returns:

a string representation of the object.

Definition Classes
Source:
DynamicVariable.scala
def value: T

Retrieve the current value

Retrieve the current value

Attributes

Source:
DynamicVariable.scala
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.

Attributes

Source:
DynamicVariable.scala
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.

Attributes

newval

The value to which to set the variable

thunk

The code to evaluate under the new setting

Source:
DynamicVariable.scala