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y_VXc@s>dZddlZejd��Zdefd��YZdS(s) A few useful function/method decorators.i����NcCsjt|dd�}|dkr.i|_}ny||SWn)tk
re|||�||<}|SXdS(s>Simple decorator to cache result of method calls without args.t__cacheN(tgetattrtNoneRtKeyError(tfunctinstancetargstkwargstcachetresult((sC/opt/alt/python27/lib/python2.7/site-packages/astroid/decorators.pytcacheds
tcachedpropertycBs8eZdZdZd�Zed��Zdd�ZRS(s� Provides a cached property equivalent to the stacking of
    @cached and @property, but more efficient.

    After first usage, the <property_name> becomes part of the object's
    __dict__. Doing:

      del obj.<property_name> empties the cache.

    Idea taken from the pyramid_ framework and the mercurial_ project.

    .. _pyramid: http://pypi.python.org/pypi/pyramid
    .. _mercurial: http://pypi.python.org/pypi/Mercurial
    twrappedcCs<y|jWn!tk
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