| 1 | 13a14,15
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| 2 | > #include <boost/type_traits/is_base_of.hpp>
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| 3 | > #include <boost/utility/enable_if.hpp>
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| 4 | 45a48,51
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| 5 | >
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| 6 | > // Implicit conversion from child-type reference_wrapper
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| 7 | > template <typename FromT>
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| 8 | > reference_wrapper(reference_wrapper<FromT> const& wrapper,typename boost::enable_if<boost::is_base_of<T,FromT> >::type* =0): t_(wrapper.t_) {}
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| 9 | 51a58,61
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| 10 | >
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| 11 | > // Implicit conversion to parent-type references
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| 12 | > template <typename ToT>
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| 13 | > operator typename boost::enable_if<boost::is_base_of<ToT,T>,ToT>::type () const { return *t_ ; }
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| 14 | 55a66
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| 15 | > template <typename OtherT> friend class reference_wrapper;
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