Edit: /usr/include/boost/units/heterogeneous_system.hpp (12258B)
// 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_HETEROGENEOUS_SYSTEM_HPP
#define BOOST_UNITS_HETEROGENEOUS_SYSTEM_HPP
/// \file
/// \brief A heterogeneous system is a sorted list of base unit/exponent pairs.
#include
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namespace boost {
namespace units {
namespace detail {
// A normal system is a sorted list of base units.
// A heterogeneous system is a sorted list of base unit/exponent pairs.
// As long as we don't need to convert heterogeneous systems
// directly everything is cool.
template
struct is_zero : mpl::false_ {};
template<>
struct is_zero > : mpl::true_ {};
} // namespace detail
/// INTERNAL ONLY
template
struct heterogeneous_system_impl
{
typedef L type;
typedef Dimensions dimensions;
typedef Scale scale;
};
/// INTERNAL ONLY
typedef dimensionless_type no_scale;
/// A system that can represent any possible combination
/// of units at the expense of not preserving information
/// about how it was created. Do not create specializations
/// of this template directly. Instead use @c reduce_unit and
/// @c base_unit<...>::unit_type.
template
struct heterogeneous_system : T {};
/// INTERNAL ONLY
struct heterogeneous_system_dim_tag {};
/// INTERNAL ONLY
template
struct heterogeneous_system_dim
{
typedef heterogeneous_system_dim_tag tag;
typedef heterogeneous_system_dim type;
typedef Unit tag_type;
typedef Exponent value_type;
};
/// INTERNAL ONLY
#define BOOST_UNITS_MAKE_HETEROGENEOUS_UNIT(BaseUnit, Dimensions) \
boost::units::unit< \
Dimensions, \
boost::units::heterogeneous_system< \
boost::units::heterogeneous_system_impl< \
boost::units::list< \
boost::units::heterogeneous_system_dim< \
BaseUnit, \
boost::units::static_rational<1> \
>, \
boost::units::dimensionless_type \
>, \
Dimensions, \
boost::units::no_scale \
> \
> \
>
} // namespace units
} // namespace boost
#if BOOST_UNITS_HAS_BOOST_TYPEOF
#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::heterogeneous_system_impl, (class)(class)(class))
BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::heterogeneous_system, (class))
BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::heterogeneous_system_dim, (class)(class))
#endif
namespace boost {
namespace mpl {
/// INTERNAL ONLY
template<>
struct less_impl
{
template
struct apply : mpl::less {};
};
}
namespace units {
namespace detail {
template
struct is_empty_dim > : detail::is_zero {};
} // namespace detail
} // namespace units
namespace mpl {
/// INTERNAL ONLY
template<>
struct plus_impl
{
template
struct apply
{
typedef boost::units::heterogeneous_system_dim<
typename T0::tag_type,
typename mpl::plus::type
> type;
};
};
/// INTERNAL ONLY
template<>
struct times_impl
{
template
struct apply
{
typedef boost::units::heterogeneous_system_dim<
typename T0::tag_type,
typename mpl::times::type
> type;
};
};
/// INTERNAL ONLY
template<>
struct divides_impl
{
template
struct apply
{
typedef boost::units::heterogeneous_system_dim<
typename T0::tag_type,
typename mpl::divides::type
> type;
};
};
/// INTERNAL ONLY
template<>
struct negate_impl
{
template
struct apply
{
typedef boost::units::heterogeneous_system_dim::type> type;
};
};
} // namespace mpl
namespace units {
namespace detail {
template
struct make_heterogeneous_system_impl
{
template
struct apply
{
typedef typename push_front_if::value)>::template apply<
typename make_heterogeneous_system_impl::template apply<
typename UnitsBegin::next,
typename ExponentsBegin::next
>::type,
heterogeneous_system_dim
>::type type;
};
};
template<>
struct make_heterogeneous_system_impl<0>
{
template
struct apply
{
typedef dimensionless_type type;
};
};
template
struct make_heterogeneous_system
{
typedef typename calculate_base_unit_exponents::type exponents;
BOOST_MPL_ASSERT_MSG((!boost::is_same::value), the_specified_dimension_is_not_representible_in_the_given_system, (types));
typedef typename make_heterogeneous_system_impl::template apply<
typename System::type,
exponents
>::type unit_list;
typedef heterogeneous_system > type;
};
template
struct make_heterogeneous_system >
{
typedef heterogeneous_system type;
};
template
struct multiply_systems
{
typedef heterogeneous_system<
heterogeneous_system_impl<
typename mpl::times::type,
typename mpl::times::type,
typename mpl::times::type
>
> type;
};
template
struct divide_systems
{
typedef heterogeneous_system<
heterogeneous_system_impl<
typename mpl::divides::type,
typename mpl::divides::type,
typename mpl::divides::type
>
> type;
};
} // namespace detail
/// INTERNAL ONLY
template
struct static_power, static_rational >
{
typedef heterogeneous_system<
heterogeneous_system_impl<
typename static_power >::type,
typename static_power >::type,
typename static_power >::type
>
> type;
};
/// INTERNAL ONLY
template
struct static_root, static_rational >
{
typedef heterogeneous_system<
heterogeneous_system_impl<
typename static_root >::type,
typename static_root >::type,
typename static_root >::type
>
> type;
};
namespace detail {
template
struct unscale_heterogeneous_system_impl
{
template
struct apply
{
typedef typename push_front_or_add<
typename unscale_heterogeneous_system_impl::template apply<
typename Begin::next
>::type,
typename unscale::type
>::type type;
};
};
template<>
struct unscale_heterogeneous_system_impl<0>
{
template
struct apply
{
typedef dimensionless_type type;
};
};
} // namespace detail
/// Unscale all the base units. e.g
/// km s -> m s
/// cm km -> m^2
/// INTERNAL ONLY
template
struct unscale >
{
typedef heterogeneous_system<
heterogeneous_system_impl<
typename detail::unscale_heterogeneous_system_impl<
T::type::size::value
>::template apply<
typename T::type
>::type,
typename T::dimensions,
no_scale
>
> type;
};
/// INTERNAL ONLY
template
struct unscale >
{
typedef heterogeneous_system_dim::type, Exponent> type;
};
namespace detail {
template
struct get_scale_list_of_heterogeneous_system_impl
{
template
struct apply
{
typedef typename mpl::times<
typename get_scale_list_of_heterogeneous_system_impl::template apply<
typename Begin::next
>::type,
typename get_scale_list::type
>::type type;
};
};
template<>
struct get_scale_list_of_heterogeneous_system_impl<0>
{
template
struct apply
{
typedef dimensionless_type type;
};
};
} // namespace detail
/// INTERNAL ONLY
template
struct get_scale_list >
{
typedef typename mpl::times<
typename detail::get_scale_list_of_heterogeneous_system_impl<
T::type::size::value
>::template apply::type,
typename T::scale
>::type type;
};
/// INTERNAL ONLY
template
struct get_scale_list >
{
typedef typename static_power::type, Exponent>::type type;
};
namespace detail {
template
struct check_system : mpl::false_ {};
template
struct check_system >, Dimension> : mpl::true_ {};
} // namespace detail
} // namespace units
} // namespace boost
#endif