is_quantity.hpp 916 B

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  1. // Boost.Units - A C++ library for zero-overhead dimensional analysis and
  2. // unit/quantity manipulation and conversion
  3. //
  4. // Copyright (C) 2003-2008 Matthias Christian Schabel
  5. // Copyright (C) 2008 Steven Watanabe
  6. //
  7. // Distributed under the Boost Software License, Version 1.0. (See
  8. // accompanying file LICENSE_1_0.txt or copy at
  9. // http://www.boost.org/LICENSE_1_0.txt)
  10. #ifndef BOOST_UNITS_IS_QUANTITY_HPP
  11. #define BOOST_UNITS_IS_QUANTITY_HPP
  12. ///
  13. /// \file
  14. /// \brief Check that a type is a quantity.
  15. ///
  16. #include <boost/mpl/bool.hpp>
  17. #include <boost/units/units_fwd.hpp>
  18. namespace boost {
  19. namespace units {
  20. /// Check that a type is a quantity.
  21. template<typename T>
  22. struct is_quantity :
  23. public mpl::false_
  24. { };
  25. template<class Unit,
  26. class Y>
  27. struct is_quantity< quantity<Unit,Y> > :
  28. public mpl::true_
  29. { };
  30. } // namespace units
  31. } // namespace boost
  32. #endif // BOOST_UNITS_IS_QUANTITY_HPP