boost/units/make_scaled_unit.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) 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/heterogeneous_system.hpp>
  15 #include <boost/units/unit.hpp>
  16
  17 namespace boost {
  18 namespace units {
  19
  20 template<class Unit, class Scale>
  21 struct make_scaled_unit {
  22     typedef typename make_scaled_unit<typename reduce_unit<Unit>::type, Scale>::type type;
  23 };
  24
  25 template<class Dimension, class UnitList, class OldScale, class Scale>
  26 struct make_scaled_unit<unit<Dimension, heterogeneous_system<heterogeneous_system_impl<UnitList, Dimension, OldScale> > >, Scale> {
  27     typedef unit<
  28         Dimension,
  29         heterogeneous_system<
  30             heterogeneous_system_impl<
  31                 UnitList,
  32                 Dimension,
  33                 typename mpl::times<
  34                     OldScale,
  35                     list<scale_list_dim<Scale>, dimensionless_type>
  36                 >::type
  37             >
  38         >
  39     > type;
  40 };
  41
  42 }
  43 }
  44
  45 #endif