enumerate emulation in C++ with boost

gistfile1.cpp

#include <boost/iterator/zip_iterator.hpp>
#include <boost/range.hpp>
#include <iostream>
#include <boost/range/counting_range.hpp>
#include <list>

template <typename... T>
auto zip(const T &... containers)
    -> boost::iterator_range<boost::zip_iterator<
        decltype(boost::make_tuple(std::begin(containers)...))>> {
  auto zip_begin =
      boost::make_zip_iterator(boost::make_tuple(std::begin(containers)...));
  auto zip_end =
      boost::make_zip_iterator(boost::make_tuple(std::end(containers)...));
  return boost::make_iterator_range(zip_begin, zip_end);
}

template <typename T> auto enumerate(const T &container) {
  return zip(boost::counting_range(0, static_cast<int>(container.size())),
             container);
}

int main() {
  std::list<std::string> a{"a", "b", "c"};
  for (auto tup : enumerate(a)) {
    int i;
    std::string el;
    boost::tie(i, el) = tup;
    std::cout << i << " " << el << std::endl;
  }
}