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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) 2007-2008 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_DETAIL_UNSCALE_HPP_INCLUDED
#define BOOST_UNITS_DETAIL_UNSCALE_HPP_INCLUDED
#include <string>
#include <boost/mpl/bool.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/begin.hpp>
#include <boost/mpl/next.hpp>
#include <boost/mpl/deref.hpp>
#include <boost/mpl/plus.hpp>
#include <boost/mpl/times.hpp>
#include <boost/mpl/negate.hpp>
#include <boost/mpl/less.hpp>
#include <boost/units/config.hpp>
#include <boost/units/dimension.hpp>
#include <boost/units/scale.hpp>
#include <boost/units/static_rational.hpp>
#include <boost/units/units_fwd.hpp>
#include <boost/units/detail/one.hpp>
namespace boost {
namespace units {
template<class T>
struct heterogeneous_system;
template<class T, class D, class Scale>
struct heterogeneous_system_impl;
template<class T, class E>
struct heterogeneous_system_dim;
template<class S, class Scale>
struct scaled_base_unit;
/// removes all scaling from a unit or a base unit.
template<class T>
struct unscale
{
#ifndef BOOST_UNITS_DOXYGEN
typedef T type;
#else
typedef detail::unspecified type;
#endif
};
/// INTERNAL ONLY
template<class S, class Scale>
struct unscale<scaled_base_unit<S, Scale> >
{
typedef typename unscale<S>::type type;
};
/// INTERNAL ONLY
template<class D, class S>
struct unscale<unit<D, S> >
{
typedef unit<D, typename unscale<S>::type> type;
};
/// INTERNAL ONLY
template<class Scale>
struct scale_list_dim;
/// INTERNAL ONLY
template<class T>
struct get_scale_list
{
typedef dimensionless_type type;
};
/// INTERNAL ONLY
template<class S, class Scale>
struct get_scale_list<scaled_base_unit<S, Scale> >
{
typedef typename mpl::times<list<scale_list_dim<Scale>, dimensionless_type>, typename get_scale_list<S>::type>::type type;
};
/// INTERNAL ONLY
template<class D, class S>
struct get_scale_list<unit<D, S> >
{
typedef typename get_scale_list<S>::type type;
};
/// INTERNAL ONLY
struct scale_dim_tag {};
/// INTERNAL ONLY
template<class Scale>
struct scale_list_dim : Scale
{
typedef scale_dim_tag tag;
typedef scale_list_dim type;
};
} // namespace units
#ifndef BOOST_UNITS_DOXYGEN
namespace mpl {
/// INTERNAL ONLY
template<>
struct less_impl<boost::units::scale_dim_tag, boost::units::scale_dim_tag>
{
template<class T0, class T1>
struct apply : mpl::bool_<((T0::base) < (T1::base))> {};
};
}
#endif
namespace units {
namespace detail {
template<class Scale>
struct is_empty_dim<scale_list_dim<Scale> > : mpl::false_ {};
template<long N>
struct is_empty_dim<scale_list_dim<scale<N, static_rational<0, 1> > > > : mpl::true_ {};
template<int N>
struct eval_scale_list_impl
{
template<class Begin>
struct apply
{
typedef typename eval_scale_list_impl<N-1>::template apply<typename Begin::next> next_iteration;
typedef typename multiply_typeof_helper<typename next_iteration::type, typename Begin::item::value_type>::type type;
static BOOST_CONSTEXPR type value()
{
return(next_iteration::value() * Begin::item::value());
}
};
};
template<>
struct eval_scale_list_impl<0>
{
template<class Begin>
struct apply
{
typedef one type;
static BOOST_CONSTEXPR one value()
{
return(one());
}
};
};
}
/// INTERNAL ONLY
template<class T>
struct eval_scale_list : detail::eval_scale_list_impl<T::size::value>::template apply<T> {};
} // namespace units
#ifndef BOOST_UNITS_DOXYGEN
namespace mpl {
/// INTERNAL ONLY
template<>
struct plus_impl<boost::units::scale_dim_tag, boost::units::scale_dim_tag>
{
template<class T0, class T1>
struct apply
{
typedef boost::units::scale_list_dim<
boost::units::scale<
(T0::base),
typename mpl::plus<typename T0::exponent, typename T1::exponent>::type
>
> type;
};
};
/// INTERNAL ONLY
template<>
struct negate_impl<boost::units::scale_dim_tag>
{
template<class T0>
struct apply
{
typedef boost::units::scale_list_dim<
boost::units::scale<
(T0::base),
typename mpl::negate<typename T0::exponent>::type
>
> type;
};
};
/// INTERNAL ONLY
template<>
struct times_impl<boost::units::scale_dim_tag, boost::units::detail::static_rational_tag>
{
template<class T0, class T1>
struct apply
{
typedef boost::units::scale_list_dim<
boost::units::scale<
(T0::base),
typename mpl::times<typename T0::exponent, T1>::type
>
> type;
};
};
/// INTERNAL ONLY
template<>
struct divides_impl<boost::units::scale_dim_tag, boost::units::detail::static_rational_tag>
{
template<class T0, class T1>
struct apply
{
typedef boost::units::scale_list_dim<
boost::units::scale<
(T0::base),
typename mpl::divides<typename T0::exponent, T1>::type
>
> type;
};
};
} // namespace mpl
#endif
} // namespace boost
#endif