Philipp Hofmann
4/12/2008 6:35:00 PM
On Sun, Apr 13, 2008 at 02:17:37AM +0900, Tim Hunter wrote:
> Ryan Lewis wrote:
>> I need to make a way to run a method when class' instance variable
>> changes from false to true and only run it once. But I have no idea how
>> to do this.
>>
>> Any ideas?
>
> Check out the observer library.
>
>
why bother with observer if this can be nicely achieved with an
appropriate setter? something like ...
class SomeClass
def initialize
@switch = false
end
def switch=(value)
on_switch_becomes_true if !@switch && (@switch = value)
end
def on_switch_becomes_true
# ...
end
end
g phil