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Returns the type that will be returned by dereferencing an iterator.
template< typename I > struct deref { typedef unspecified type; };
Table 1.12. Parameters
Parameter |
Requirement |
Description |
---|---|---|
I |
Model of Forward Iterator |
Operation's argument |
result_of::deref<I>::type
Return type: Any type
Semantics: Returns the result of dereferencing an iterator of type I.
/iterator/deref.hpp>
typedef vector<int,int&> vec; typedef const vec const_vec; typedef result_of::begin<vec>::type first; typedef result_of::next<first>::type second; typedef result_of::begin<const_vec>::type const_first; typedef result_of::next<const_first>::type const_second; BOOST_MPL_ASSERT((boost::is_same<result_of::deref<first>::type, int&>)); BOOST_MPL_ASSERT((boost::is_same<result_of::deref<second>::type, int&>));