Data inheritance problem
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- Subject: Data inheritance problem
- From: Pete Gardner <pete@...>
- Date: 2000年11月15日 12:21:09 -0800
I'm looking for a solution/workaround/explanation for the following
inheritance problem:
This test code assumes the settagmethod and clone functions are initialized
and defined...
-- Define counter Object
counter_base = {}
function counter_base:new()
self.parent = nil
self.num = 0
end
function counter_base:inc()
self.num = self.num + 1
end
function counter_base:out()
print (format("%03d ",self.num))
end
-- Implement
counter_base:new()
counter_base:out()
counter_base:inc() -- inc() works just fine here
counter_base:out()
print ("-------Child Object-------")
-- Clone a child object and further define it
counter = clone(counter_base)
function counter:new()
self.parent = counter_base
end
function counter:child_inc()
self.parent:inc() -- here's the problem code line
-- Other code
print ("Wazoo")
end
-- Implement
counter:new()
counter:out()
counter:inc() -- this works fine
counter:out()
counter:child_inc() -- but this works on counter_base's data, not
counter's
counter:out()
Am I overlooking something? Is this expected behaviour? How can I make
child_inc() work on it's own data?
Thanks very much,
Pete Gardner
Helikon Technologies Inc.
http://www.helikon.com