C++0x for_each with index

for_each_i.hpp

template <typename Iterator, typename Function>
Function for_each_i(Iterator begin, Iterator end, Function f)
{
    typedef decltype(*begin) value_type;
    int i = 0;
    return std::move(std::for_each(begin, end, [&](value_type& e) {f(i++, e);}));
}