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[SVN r22044]
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Lvalue Iterator Concept
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.......................
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The *Lvalue Iterator* concept adds the requirement that the return
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type of ``operator*`` type be a reference to the value type of the
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iterator.
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+-------------------------------------------------------------+
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| Lvalue Iterator Requirements |
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+-------------+-----------+-----------------------------------+
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|Expression |Return Type|Note/Assertion |
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+=============+===========+===================================+
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|``*a`` | ``T&`` |``T`` is *cv* |
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| | |``iterator_traits<X>::value_type`` |
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| | |where *cv* is an optional |
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| | |cv-qualification. |
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| | |pre: ``a`` is |
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| | |dereferenceable. If ``a |
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| | |== b`` then ``*a`` is |
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| | |equivalent to ``*b``. |
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+-------------+-----------+-----------------------------------+
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