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_QUANTITY_OF_SYSTEM_HPP
12 #define BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
13 
14 ///
15 /// \file
16 /// \brief Check that a type is a quantity in a specified system.
17 ///
18 
19 #include <boost/mpl/bool.hpp>
20 #include <boost/units/units_fwd.hpp>
21 #include <boost/units/is_unit_of_system.hpp>
22 
23 namespace boost {
24 
25 namespace units {
26 
27 /// Check that a type is a quantity in a specified system.
28 template<class T,class System>
29 struct is_quantity_of_system :
30     public mpl::false_
31 { };
32 
33 template<class Unit,class Y,class System>
34 struct is_quantity_of_system< quantity< Unit,Y>,System > :
35     public is_unit_of_system<Unit, System>
36 { };
37 
38 } // namespace units
39 
40 } // namespace boost
41 
42 #endif // BOOST_UNITS_IS_QUANTITY_OF_SYSTEM_HPP
43