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#include <tuple>
#include <iostream>
 
template<int N> using  Int = std::integral_constant<int, N>;
template<bool B> using  Bool = std::integral_constant<Bool, N>;
template<typename Tuple> using TupleSize = typename std::tuple_size<Tuple>::type;
 
template<class Ch, class Tr, class Tuple, std::size_t I>
void print_tuple(std::basic_ostream<Ch,Tr>& os, Tuple const& t, Int<I>){
  do_the_printing(std::get<I>(t), Bool<I != 0>{} /* tells whether to have delimiters before */);
  print_tuple(os, t, int_<I+1>{});
}
 
// also handles empty tuples nicely
template<class Ch, class Tr, class Tuple>
void print_tuple(std::basic_ostream<Ch,Tr>& os, Tuple const& t, TupleSize<Tuple>) {}
 
template<class Ch, class Traits, class Tuple>
void print(std::basic_ostream<Ch,Traits>& os, Tuple const& t){
  os << "(";
  print_tuple(os, t, int_<0>{});
  os << ")";
}
 
int main(){
  print(std::cout, std::make_tuple(5, "Hello", -0.1));
}

prog.cpp:4:17: error: expected unqualified-id before 'using'
prog.cpp:5:18: error: expected unqualified-id before 'using'
prog.cpp:6:26: error: expected unqualified-id before 'using'
prog.cpp:9:65: error: 'Int' has not been declared
prog.cpp:9:68: error: expected ',' or '...' before '<' token
prog.cpp: In function 'void print_tuple(std::basic_ostream<_CharT, _Traits>&, const Tuple&, int)':
prog.cpp:10:35: error: 'Bool' was not declared in this scope
prog.cpp:10:47: error: expected primary-expression before '{' token
prog.cpp:11:22: error: 'int_' was not declared in this scope
prog.cpp:11:31: error: expected primary-expression before '{' token
prog.cpp: At global scope:
prog.cpp:16:65: error: 'TupleSize' has not been declared
prog.cpp:16:74: error: expected ',' or '...' before '<' token
prog.cpp: In function 'void print(std::basic_ostream<_CharT, _Traits>&, const Tuple&)':
prog.cpp:21:22: error: 'int_' was not declared in this scope
prog.cpp:21:29: error: expected primary-expression before '{' token

Standard output is empty