text: // Copyright (c) 2019-2020 Daniel Frey
  // Please see LICENSE for license or visit https://github.com/taocpp/sequences/
  
  #include <tao/seq/integer_sequence.hpp>
  #include <tao/seq/prod.hpp>
  
  int main()
  {
     using namespace tao::seq;
  
     static_assert( prod< int >::value == 1, "oops" );
     static_assert( prod< int, -1, 4, 5 >::value == -20, "oops" );
     static_assert( prod< index_sequence<> >::value == 1, "oops" );
     static_assert( prod< integer_sequence< int, -1, 4, 5 > >::value == -20, "oops" );
  }
  