text: // Copyright Louis Dionne 2013-2017
  // Distributed under the Boost Software License, Version 1.0.
  // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
  
  #include <boost/hana/cartesian_product.hpp>
  #include <boost/hana/equal.hpp>
  #include <boost/hana/tuple.hpp>
  #include <boost/hana/type.hpp>
  namespace hana = boost::hana;
  
  
  constexpr auto tuples = hana::make_tuple(
      hana::make_tuple(1, 2, 3),
      hana::make_tuple('a', 'b'),
      hana::make_tuple(hana::type_c<int>, hana::type_c<char>)
  );
  
  constexpr auto prod = hana::make_tuple(
      hana::make_tuple(1, 'a', hana::type_c<int>),
      hana::make_tuple(1, 'a', hana::type_c<char>),
      hana::make_tuple(1, 'b', hana::type_c<int>),
      hana::make_tuple(1, 'b', hana::type_c<char>),
  
      hana::make_tuple(2, 'a', hana::type_c<int>),
      hana::make_tuple(2, 'a', hana::type_c<char>),
      hana::make_tuple(2, 'b', hana::type_c<int>),
      hana::make_tuple(2, 'b', hana::type_c<char>),
  
      hana::make_tuple(3, 'a', hana::type_c<int>),
      hana::make_tuple(3, 'a', hana::type_c<char>),
      hana::make_tuple(3, 'b', hana::type_c<int>),
      hana::make_tuple(3, 'b', hana::type_c<char>)
  );
  
  static_assert(hana::cartesian_product(tuples) == prod, "");
  
  int main() { }
  