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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 |
---|---|---|
I |
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.
/iterator/prior.hpp>
typedef vector<int,double> vec; typedef result_of::next<result_of::begin<vec>::type>::type second; BOOST_MPL_ASSERT((boost::is_same<result_of::value_of<second>::type, double>)); typedef result_of::prior<second>::type first; BOOST_MPL_ASSERT((boost::is_same<result_of::value_of<first>::type, int>));