distance

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 1.5. Parameters

Parameter	Requirement	Description
`i`, `j`	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>

typedef vector<int,int,int> vec;

vec v(1,2,3);
assert(distance(begin(v), next(next(begin(v)))) == 2);