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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_DIMENSIONLESS_UNIT_HPP
#define BOOST_UNITS_DETAIL_DIMENSIONLESS_UNIT_HPP
#include <boost/mpl/bool.hpp>
#include <boost/units/units_fwd.hpp>
namespace boost {
namespace units {
template<class T>
struct heterogeneous_system;
template<class T>
struct homogeneous_system;
template<class T1, class T2, class Scale>
struct heterogeneous_system_impl;
typedef boost::units::heterogeneous_system<
boost::units::heterogeneous_system_impl<
boost::units::dimensionless_type,
boost::units::dimensionless_type,
boost::units::dimensionless_type
>
> heterogeneous_dimensionless_system;
namespace detail {
template<class System>
struct void_if_dimensionless {
typedef int type;
};
template<class T>
struct void_if_dimensionless<boost::units::homogeneous_system<T> > {
typedef void type;
};
template<>
struct void_if_dimensionless<heterogeneous_dimensionless_system> {
typedef void type;
};
template<class System, class Test = void>
struct void_if_heterogeneous {
typedef void type;
};
template<class System>
struct void_if_heterogeneous<System, typename void_if_dimensionless<System>::type> {
typedef int type;
};
template<class System, class Enable=void>
struct is_dimensionless_system : mpl::false_ {};
template<class System>
struct is_dimensionless_system<System, typename void_if_dimensionless<System>::type> : mpl::true_ {};
#define BOOST_UNITS_DIMENSIONLESS_UNIT(T)\
boost::units::unit<\
boost::units::dimensionless_type,\
T,\
typename ::boost::units::detail::void_if_dimensionless<T>::type\
>
#define BOOST_UNITS_HETEROGENEOUS_DIMENSIONLESS_UNIT(T)\
boost::units::unit<\
boost::units::dimensionless_type,\
T,\
typename ::boost::units::detail::void_if_heterogeneous<T>::type\
>
}
}
}
#endif
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