boost/units/is_unit_of_system.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_UNIT_OF_SYSTEM_HPP
  12 #define BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP
  13
  14 #include <boost/mpl/bool.hpp>
  15 #include <boost/units/units_fwd.hpp>
  16
  17 namespace boost {
  18
  19 namespace units {
  20
  21 /// check that a type is a unit in a specified system
  22 template<class T,class System>
  23 struct is_unit_of_system :
  24     public mpl::false_
  25 { };
  26
  27 template<class Dim,class System>
  28 struct is_unit_of_system< unit<Dim,System>,System > :
  29     public mpl::true_
  30 { };
  31
  32 template<class Dim,class System>
  33 struct is_unit_of_system< absolute<unit<Dim,System> >,System > :
  34     public mpl::true_
  35 { };
  36
  37 } // namespace units
  38
  39 } // namespace boost
  40
  41 #endif // BOOST_UNITS_IS_UNIT_OF_SYSTEM_HPP