Declare interfaces implemented by instances of a class
This function is called in a class definition.
The arguments are one or more interfaces or interface
specifications (IDeclaration objects).
The interfaces given (including the interfaces in the
specifications) are added to any interfaces previously
declared.
Previous declarations include declarations for base classes
unless implementsOnly was used.
This function is provided for convenience. It provides a more
convenient way to call classImplements. For example:
implements(I1)
is equivalent to calling:
classImplements(C, I1)
after the class has been created.
Consider the following example:
>>> from zope.interface import Interface
>>> class IA1(Interface): pass
...
>>> class IA2(Interface): pass
...
>>> class IB(Interface): pass
...
>>> class IC(Interface): pass
...
>>> class A(object): implements(IA1, IA2)
...
>>> class B(object): implements(IB)
...
>>> class C(A, B):
... implements(IC)
>>> ob = C()
>>> int(IA1 in providedBy(ob))
1
>>> int(IA2 in providedBy(ob))
1
>>> int(IB in providedBy(ob))
1
>>> int(IC in providedBy(ob))
1
Instances of C implement I1, I2, and whatever interfaces
instances of A and B implement.
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