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Viewing changes to bzrlib/_static_tuple_py.py

  • Committer: John Arbash Meinel
  • Date: 2009-10-13 18:00:16 UTC
  • mto: This revision was merged to the branch mainline in revision 4755.
  • Revision ID: john@arbash-meinel.com-20091013180016-y9ciypkm8lor58fx
Implement StaticTuple.from_sequence()

This allows casting from something that *might* be a StaticTuple
into something that is definitely a StaticTuple, without having to
create a new instance.

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Lines of Context:
bzrlib/_static_tuple_py.py
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    def intern(self):
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        return _interned_tuples.setdefault(self, self)
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    @staticmethod
 
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    def from_sequence(seq):
 
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        """Convert a sequence object into a StaticTuple instance."""
 
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        if isinstance(seq, StaticTuple):
 
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            # it already is
 
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            return seq
 
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        return StaticTuple(*seq)
 
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# Have to set it to None first, so that __new__ can determine whether
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# the _empty_tuple singleton has been created yet or not.