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Returns the distance between 2 iterators.
template<
    typename I,
    typename J
    >
typename result_of::distance<I, J>::type distance(I const& i, J const& j);
Table 1.4. Parameters
| Parameter | Requirement | Description | 
|---|---|---|
| 
                     | Models of Forward Iterator into the same sequence | The start and end points of the distance to be measured | 
distance(i,j);
          Return type: int
        
          Semantics: Returns the distance between
          iterators i and j.
        
#include <boost/fusion/iterator/distance.hpp> #include <boost/fusion/include/distance.hpp>
typedefvector<int,int,int> vec; vec v(1,2,3); assert(distance(begin(v),next(next(begin(v)))) == 2);