[Swig-user] Strange behaviour with lua and pointers

[<gle...@gm...>]

Yesterday doing some tests with one framework that I'm programming I  
had some troubles with classes and their instances. They're having an  
strange behaviour treating instance class/local variables as static  
ones... . I don't understand why It's working in that way. Maybe I  
would go to swig forums because it's a behaviour derived of swig  
wrapping?

Imagine the next situation:

class timer : public plugin {
	int starttime;
	void start(void) {
		starttime = getTick();
	}
	int getMs(void) {
		return getTick() - starttime;
	}
}

class effect : public plugin {
void render(plugin *timer) {
	timer.exec("start");
}
}

exec(char *f) is a function which takes the name of a function and  
executes it. Inherited by plugin class.

test1.lua:

require('timer');

a=timer.timer(); a:start();
b=timer.timer();

while (escaped not pressed) do
	b.start();
end

print(a.getMs());
print(b.getMs());

expected & returned:
a the miliseconds counted until escape was pressed.
b aproximately 0.

test2.lua

require('effect')
require('timer');

f=effect.effect();

a=timer.timer(); a:start();
b=timer.timer();

while(escaped not pressed) do
	f:render(b);
end

print(a.getMs());
print(b.getMs());

expected:
a the miliseconds counted until escape was pressed.
b aproximately 0.

returned:
a aproximately 0.
b aproximately 0.

I found that in the first case the starttime memory places of a and b  
are different. In the second case a and b have starttime in the same  
memory place.

This info was taken inside de render function, if a do a function to  
print the pointer of the same class, the pointer is well retrieved.  
(ex.: a:getpluginpointer() GOOD, f.render(a) and inside call  
a:getpluginpointer(), a and b return the same plugin pointer)

'a': 	pointer: 0x1141d0
'b': 	pointer: 0x1141d0

Why? :\

Thanks in advance.

Gorka Lertxundi Osa