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+// Boost.Units - A C++ library for zero-overhead dimensional analysis and
+// unit/quantity manipulation and conversion
+//
+// Copyright (C) 2003-2008 Matthias Christian Schabel
+// Copyright (C) 2008 Steven Watanabe
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#ifndef BOOST_UNITS_ABSOLUTE_IMPL_HPP
+#define BOOST_UNITS_ABSOLUTE_IMPL_HPP
+
+#include <iosfwd>
+
+#include <boost/units/config.hpp>
+#include <boost/units/conversion.hpp>
+#include <boost/units/heterogeneous_system.hpp>
+#include <boost/units/units_fwd.hpp>
+
+namespace boost {
+
+namespace units {
+
+/// INTERNAL ONLY
+template<class D, class S>
+struct reduce_unit<absolute<unit<D, S> > >
+{
+ typedef absolute<typename reduce_unit<unit<D, S> >::type> type;
+};
+
+namespace detail {
+
+struct undefined_affine_conversion_base {
+ static const bool is_defined = false;
+};
+
+} // namespace detail
+
+/// INTERNAL ONLY
+template<class From, class To>
+struct affine_conversion_helper : detail::undefined_affine_conversion_base { };
+
+namespace detail {
+
+template<bool IsDefined, bool ReverseIsDefined>
+struct affine_conversion_impl;
+
+template<bool ReverseIsDefined>
+struct affine_conversion_impl<true, ReverseIsDefined>
+{
+ template<class Unit1, class Unit2, class T0, class T1>
+ struct apply {
+ static T1 value(const T0& t0)
+ {
+ return(
+ t0 *
+ conversion_factor(Unit1(), Unit2()) +
+ affine_conversion_helper<typename reduce_unit<Unit1>::type, typename reduce_unit<Unit2>::type>::value());
+ }
+ };
+};
+
+template<>
+struct affine_conversion_impl<false, true>
+{
+ template<class Unit1, class Unit2, class T0, class T1>
+ struct apply
+ {
+ static T1 value(const T0& t0)
+ {
+ return(
+ (t0 - affine_conversion_helper<typename reduce_unit<Unit2>::type, typename reduce_unit<Unit1>::type>::value()) *
+ conversion_factor(Unit1(), Unit2()));
+ }
+ };
+};
+
+} // namespace detail
+
+/// INTERNAL ONLY
+template<class Unit1, class T1, class Unit2, class T2>
+struct conversion_helper<quantity<absolute<Unit1>, T1>, quantity<absolute<Unit2>, T2> >
+{
+ typedef quantity<absolute<Unit1>, T1> from_quantity_type;
+ typedef quantity<absolute<Unit2>, T2> to_quantity_type;
+ static to_quantity_type convert(const from_quantity_type& source)
+ {
+ return(
+ to_quantity_type::from_value(
+ detail::affine_conversion_impl<
+ affine_conversion_helper<typename reduce_unit<Unit1>::type, typename reduce_unit<Unit2>::type>::is_defined,
+ affine_conversion_helper<typename reduce_unit<Unit2>::type, typename reduce_unit<Unit1>::type>::is_defined
+ >::template apply<Unit1, Unit2, T1, T2>::value(source.value())
+ )
+ );
+ }
+};
+
+} // namespace units
+
+} // namespace boost
+
+#endif // BOOST_UNITS_ABSOLUTE_IMPL_HPP