ceph/src/boost/libs/units/include/boost/units/is_dimension_list.hpp

   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
  11 #ifndef BOOST_UNITS_IS_DIMENSION_LIST_HPP
  12 #define BOOST_UNITS_IS_DIMENSION_LIST_HPP
  13
  14 ///
  15 /// \file
  16 /// \brief Check that a type is a valid dimension list.
  17 ///
  18
  19 #include <boost/mpl/bool.hpp>
  20
  21 #include <boost/units/units_fwd.hpp>
  22
  23 namespace boost {
  24
  25 namespace units {
  26
  27 /// Check that a type is a valid dimension list.
  28 template<typename Seq>
  29 struct is_dimension_list :
  30     public mpl::false_
  31 { };
  32
  33 template<typename Item, typename Next>
  34 struct is_dimension_list<list<Item, Next> > :
  35     public mpl::true_
  36 { };
  37
  38 template<>
  39 struct is_dimension_list<dimensionless_type> :
  40     public mpl::true_
  41 { };
  42
  43 } // namespace units
  44
  45 } // namespace boost
  46
  47 #endif // BOOST_UNITS_IS_DIMENSION_LIST_HPP