boost/units/is_quantity_of_system.hpp

0001 // Boost.Units - A C++ library for zero-overhead dimensional analysis and
0002 // unit/quantity manipulation and conversion
0003 //
0004 // Copyright (C) 2003-2008 Matthias Christian Schabel
0005 // Copyright (C) 2008 Steven Watanabe
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See
0008 // accompanying file LICENSE_1_0.txt or copy at
0009 // http://www.boost.org/LICENSE_1_0.txt)
0010
0011 #ifndef BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
0012 #define BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
0013
0014 ///
0015 /// \file
0016 /// \brief Check that a type is a quantity in a specified system.
0017 ///
0018
0019 #include <boost/mpl/bool.hpp>
0020 #include <boost/units/units_fwd.hpp>
0021 #include <boost/units/is_unit_of_system.hpp>
0022
0023 namespace boost {
0024
0025 namespace units {
0026
0027 /// Check that a type is a quantity in a specified system.
0028 template<class T,class System>
0029 struct is_quantity_of_system :
0030     public mpl::false_
0031 { };
0032
0033 template<class Unit,class Y,class System>
0034 struct is_quantity_of_system< quantity< Unit,Y>,System > :
0035     public is_unit_of_system<Unit, System>
0036 { };
0037
0038 } // namespace units
0039
0040 } // namespace boost
0041
0042 #endif // BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP