comparable.hpp 902 B

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  1. /*!
  2. @file
  3. Defines `boost::hana::Comparable`.
  4. Copyright Louis Dionne 2013-2022
  5. Distributed under the Boost Software License, Version 1.0.
  6. (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
  7. */
  8. #ifndef BOOST_HANA_CONCEPT_COMPARABLE_HPP
  9. #define BOOST_HANA_CONCEPT_COMPARABLE_HPP
  10. #include <boost/hana/fwd/concept/comparable.hpp>
  11. #include <boost/hana/config.hpp>
  12. #include <boost/hana/core/default.hpp>
  13. #include <boost/hana/core/tag_of.hpp>
  14. #include <boost/hana/detail/integral_constant.hpp>
  15. #include <boost/hana/equal.hpp>
  16. namespace boost { namespace hana {
  17. template <typename T>
  18. struct Comparable
  19. : hana::integral_constant<bool,
  20. !is_default<equal_impl<typename tag_of<T>::type,
  21. typename tag_of<T>::type>>::value
  22. >
  23. { };
  24. }} // end namespace boost::hana
  25. #endif // !BOOST_HANA_CONCEPT_COMPARABLE_HPP