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) 2007-2008 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_MAKE_SCALED_UNIT_HPP_INCLUDED
12 #define BOOST_UNITS_MAKE_SCALED_UNIT_HPP_INCLUDED
13 
14 #include <boost/units/units_fwd.hpp>
15 #include <boost/units/heterogeneous_system.hpp>
16 #include <boost/units/unit.hpp>
17 
18 namespace boost {
19 namespace units {
20 
21 template<class Unit, class Scale>
22 struct make_scaled_unit {
23     typedef typename make_scaled_unit<typename reduce_unit<Unit>::type, Scale>::type type;
24 };
25 
26 template<class Dimension, class UnitList, class OldScale, class Scale>
27 struct make_scaled_unit<unit<Dimension, heterogeneous_system<heterogeneous_system_impl<UnitList, Dimension, OldScale> > >, Scale> {
28     typedef unit<
29         Dimension,
30         heterogeneous_system<
31             heterogeneous_system_impl<
32                 UnitList,
33                 Dimension,
34                 typename mpl::times<
35                     OldScale,
36                     list<scale_list_dim<Scale>, dimensionless_type>
37                 >::type
38             >
39         >
40     > type;
41 };
42 
43 template<class Dimension, class UnitList, class OldScale, long Base>
44 struct make_scaled_unit<unit<Dimension, heterogeneous_system<heterogeneous_system_impl<UnitList, Dimension, OldScale> > >, scale<Base, static_rational<0> > > {
45     typedef unit<
46         Dimension,
47         heterogeneous_system<
48             heterogeneous_system_impl<
49                 UnitList,
50                 Dimension,
51                 OldScale
52             >
53         >
54     > type;
55 };
56 
57 }
58 }
59 
60 #endif
61