/prelude/delimited_ostream.hpp

http://github.com/Eelis/geordi · C++ Header · 48 lines · 36 code · 12 blank · 0 comment · 1 complexity · 4c5cec86435f94bbb17e228e837918ac MD5 · raw file 

    

  1. #ifndef DELIMITED_OSTREAM_HPP
    2. 

  2. #define DELIMITED_OSTREAM_HPP
    3. 

  3. 

  4. #include <iostream>
    5. 

  5. #include <ios>
    6. 

  6. 

  7. #if __cplusplus >= 201103
    8. 

  8. 

  9. #include <type_traits>
    10. 

  10. 

  11. namespace del_ostream_detail
    12. 

  12. {
    13. 

  13.   template<typename T> constexpr bool take_by_value()
    14. 

  14.   { return std::is_integral<T>::value || std::is_enum<T>::value; }
    15. 

  15. }
    16. 

  16. 

  17. template <typename Ch, typename Tr, typename T>
    18. 

  18. inline typename std::enable_if<
    19. 

  19.     !del_ostream_detail::take_by_value<T>(),
    20. 

  20.     std::basic_ostream<Ch, Tr> >::type &
    21. 

  21.   operator,(std::basic_ostream<Ch, Tr> & o, T const & t)
    22. 

  22. { return o << ", " << t; }
    23. 

  23. 

  24. template <typename Ch, typename Tr, typename T>
    25. 

  25. inline typename std::enable_if<
    26. 

  26.     del_ostream_detail::take_by_value<T>(),
    27. 

  27.     std::basic_ostream<Ch, Tr> >::type &
    28. 

  28.   operator,(std::basic_ostream<Ch, Tr> & o, T const t)
    29. 

  29. { return o << ", " << t; }
    30. 

  30. 

  31. #else
    32. 

  32. 

  33. template <typename Ch, typename Tr, typename T>
    34. 

  34. inline std::basic_ostream<Ch, Tr> &
    35. 

  35.   operator,(std::basic_ostream<Ch, Tr> & o, T const & t)
    36. 

  36. { return o << ", " << t; }
    37. 

  37. 

  38. #endif
    39. 

  39. 

  40. template <typename Ch, typename Tr>
    41. 

  41. std::basic_ostream<Ch, Tr> & operator, (std::basic_ostream<Ch, Tr> & o, std::ios_base & (* const f) (std::ios_base &))
    42. 

  42. { return o << f; }
    43. 

  43. 

  44. template <typename Ch, typename Tr>
    45. 

  45. std::basic_ostream<Ch, Tr> & operator, (std::basic_ostream<Ch, Tr> & o, std::basic_ostream<Ch, Tr> & (* const f) (std::basic_ostream<Ch, Tr> &))
    46. 

  46. { return o << f; }
    47. 

  47. 

  48. #endif // header guard
    49.