[C++-sig] return_self_policy

[Nikolay Mladenov]

Posting return_self policy implementation

Nikolay
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'''
>>> from return_self import *
>>> l1=Label()
>>> l1 is l1.label("bar")
1
>>> l1 is l1.label("bar").sensitive(0)
1
>>> l1.label("foo").sensitive(0) is l1.sensitive(1).label("bar")
1


'''

def run(args = None):
    import sys
    import doctest

    if args is not None:
        sys.argv = args
    return doctest.testmod(sys.modules.get(__name__))
    
if __name__ == '__main__':
    print "running..."
    import sys
    sys.exit(run()[0])
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