| class Binding |
|
Index:
Objects of class
Binding encapsulate the execution context at some
particular place in the code and retain this context for future use.
The variables, methods, value of self, and possibly an iterator
block that can be accessed in this context are all retained.
Binding objects can be created using Kernel#binding, and are
made available to the callback of Kernel#set_trace_func.
These binding objects can be passed as the second argument of the
Kernel#eval method, establishing an environment for the
evaluation.
class Demo |
||
def initialize(n) |
||
@secret = n |
||
end |
||
def getBinding |
||
return binding() |
||
end |
||
end |
||
|
||
k1 = Demo.new(99) |
||
b1 = k1.getBinding |
||
k2 = Demo.new(-3) |
||
b2 = k2.getBinding |
||
|
||
eval("@secret", b1) |
-> | 99 |
eval("@secret", b2) |
-> | -3 |
eval("@secret") |
-> | nil |
Binding objects have no class-specific methods.
Extracted from the book "Programming Ruby - The Pragmatic Programmer's Guide"
Copyright © 2000 Addison Wesley Longman, Inc. Released under the terms of the Open Publication License V1.0.
This reference is available for download.