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Returns the distance between two iterators.
template< typename I, typename J > struct distance { typedef unspecified type; };
Table 1.16. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                     | Models of Forward Iterator into the same sequence | The start and end points of the distance to be measured | 
result_of::distance<I, J>::type
Return type: A model of MPL Integral Constant.
          Semantics: Returns the distance between
          iterators of types I and
          J.
        
#include <boost/fusion/iterator/distance.hpp> #include <boost/fusion/include/distance.hpp>
typedefvector<int,double,char> vec; typedefresult_of::begin<vec>::type first; typedefresult_of::next<first>::type second; typedefresult_of::next<second>::type third; typedefresult_of::distance<first,third>::type dist; BOOST_MPL_ASSERT_RELATION(dist::value, ==, 2);