Hi!
is the order of the list of interfaces implemented by an object subject
to internal changes?
I have identified the need for such a pattern:
iface = object.interface()
with:
class someObject(object):
implements(IMainInterface, ISecondaryInterface, ...)
def interface():
"""Return the most specific interface implemented by the element."""
return list(providedBy(self))[0]
to be able in that case to get access to the first interface implemented
by an object, as a sort of main object type.
the zope/app/component/registration.txt documentation mentions:
"""
We can now write another `IComponentRegistration` implementation that knows
about the interface; in fact, it will pick the most specific one of the
component:
>>> from zope.interface import providedBy
>>> class SomethingRegistration(Registration):
...
... def interface(self):
... return list(providedBy(self._component))[0]
... interface = property(interface)
"""
but I haven't seen it used anywhere else. Is it safe to use this?
regards /JM
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