Newbie: Inheriting with tolua from C++ class
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- Subject: Newbie: Inheriting with tolua from C++ class
- From: "thedentde" <thedent@...>
- Date: 2002年3月03日 14:19:12 -0000
Hi there,
i'am trying around with tolua an lua since yesterday, so i'am a
newbie and maybe you will forgive me if my question is somewhat
stupid.
i tried to do the following:
i wrote a c++ class foo and "exported" it to lua with the aid of
tolua. Everithing went just fine.
later, i tried the inheritance example with the Point and ColorPoint
class from the tolua homepage
which goes like this:
---------------------------------------------------------------------
----------------------------------------------------------------------
- define a Point class
classPoint = { x=0, y=0 }
tolua.class(classPoint) -- set as a class
-- define print method
function classPoint:print ()
print(self.x,self.y)
end
-- define add method
function classPoint:add (p2)
return Point{x=self.x+p2.x,y=self.y+p2.y}
end
-- define a Point constructor
function Point (p)
tolua.instance(p,classPoint) -- set as an instance of classPoint
return p end
-- define a Color Point class
classColorPoint = { color = 'black' }
tolua.class(classColorPoint,classPoint) -- set as class inheriting
from classPoint
-- define class methods
function classColorPoint:print ()
print(self.x,self.y,self.color)
end
-- define Color Point constructor
function ColorPoint (p)
tolua.instance(p,classColorPoint) -- set as an instance of
classColorPoint
return p
end
---------------------------------------------------------------------
---------------------------------------------------------------------
again, everything fine, everyone happy.
now as the next step I changed the line 3 to
tolua.class(classPoint, foo) -- set as a class and inherit from c++
class foo
now, that does not semm to work as i expected it. I hoped, that if i
call
x = ColorPoint{}
then there would magicaly a new intance of the c++ class foo
generated... but this semms to be not the case...
on the other hand, using a line like
x = ColorPoint:new()
does the instantiation of an foo-object, but then the type of x is
not ColorPoint (I think???).
Now the question:
Why is that so?
did i make a mistake?
Is there NO way to inherit from a c++ class exposed by tolua?
Any help appreciated,
thanks and cheers,
David Strippgen