6.171 ValueHolder

Defined in namespace Smalltalk

Category: Language-Data types

I store my value in a variable, and know whether I have been initialized or not. If you ask for my value and I have not been initialized, I suspend the process until a value has been assigned.

6.171.1 ValueHolder class: creating instances		(class)
6.171.2 ValueHolder: accessing		(instance)
6.171.3 ValueHolder: initializing		(instance)

6.171.1 ValueHolder class: creating instances

new

Create a ValueHolder whose starting value is nil

null

Answer the sole instance of NullValueHolder

with: anObject

Create a ValueHolder whose starting value is anObject

6.171.2 ValueHolder: accessing

value

Get the value of the receiver.

value: anObject

Set the value of the receiver.

6.171.3 ValueHolder: initializing

initialize

Private - set the initial value of the receiver