#include <boost/range/adaptor/strided.hpp>
#include <vector>
#include <iostream>
#include <ostream>
#include <algorithm>

template<typename It>
It Prev1(It i)
{ 
  --i; 
  return i;
}

template<typename It>
It Prev2(It i)
{ return i - 1; }

template<typename Con>
void check_container(const Con& con)
{
  std::cout << std::distance(con.begin(), con.end()) << std::endl;
  std::cout << std::distance(con.begin(), Prev1(con.end())) << std::endl;
  std::cout << std::distance(con.begin(), Prev2(con.end())) << std::endl;
}

int main(void)
{
  std::vector<int> v;
  v.push_back(1);
  check_container(v | boost::adaptors::strided(2));
}