// 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 |