Mario Figueiredo wrote:
It's just a cheap global, since is ubiquitous throughout the entire
application, does behave like a singleton, and is a bit too expensive
to create. A full map in the main application takes 3 or 4 seconds to
instantiate and occupies around 2 Mb of memory.
There's nothing wrong with having only one instance. The
quesion is whether it's a good idea to make calling Map()
be the way to get hold of that instance.
I would say it's counterproductive. The implementation
is convoluted, and it makes code that calls Map()
confusing, because it looks like it's creating a new
instance when it really isn't.
I would just provide a function:
_map = None
def get_map():
global _map
if _map is None:
_map = Map()
return _map
and document the fact that you shouldn't call Map()
directly.
--
Greg
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