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Returns the type of the previous iterator in a sequence.
template< typename I > struct prior { typedef unspecified type; };
Table 1.14. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                     | Model of Bidirectional Iterator | Operation's argument | 
result_of::prior<I>::type
          Return type: A model of the same iterator
          concept as I.
        
          Semantics: Returns an iterator to the
          previous element in the sequence before I.
        
#include <boost/fusion/iterator/prior.hpp> #include <boost/fusion/include/prior.hpp>
typedefvector<int,double> vec; typedefresult_of::next<result_of::begin<vec>::type>::type second; BOOST_MPL_ASSERT((boost::is_same<result_of::value_of<second>::type, double>)); typedefresult_of::prior<second>::type first; BOOST_MPL_ASSERT((boost::is_same<result_of::value_of<first>::type, int>));