89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
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// Boost.Units - A C++ library for zero-overhead dimensional analysis and
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// unit/quantity manipulation and conversion
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//
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// Copyright (C) 2003-2008 Matthias Christian Schabel
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// Copyright (C) 2007-2008 Steven Watanabe
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_UNITS_DETAIL_DIMENSIONLESS_UNIT_HPP
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#define BOOST_UNITS_DETAIL_DIMENSIONLESS_UNIT_HPP
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#include <boost/mpl/bool.hpp>
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#include <boost/units/units_fwd.hpp>
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namespace boost {
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namespace units {
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template<class T>
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struct heterogeneous_system;
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template<class T>
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struct homogeneous_system;
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template<class T1, class T2, class Scale>
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struct heterogeneous_system_impl;
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typedef boost::units::heterogeneous_system<
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boost::units::heterogeneous_system_impl<
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boost::units::dimensionless_type,
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boost::units::dimensionless_type,
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boost::units::dimensionless_type
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>
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> heterogeneous_dimensionless_system;
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namespace detail {
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template<class System>
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struct void_if_dimensionless {
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typedef int type;
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};
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template<class T>
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struct void_if_dimensionless<boost::units::homogeneous_system<T> > {
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typedef void type;
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};
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template<>
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struct void_if_dimensionless<heterogeneous_dimensionless_system> {
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typedef void type;
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};
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template<class System, class Test = void>
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struct void_if_heterogeneous {
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typedef void type;
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};
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template<class System>
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struct void_if_heterogeneous<System, typename void_if_dimensionless<System>::type> {
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typedef int type;
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};
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template<class System, class Enable=void>
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struct is_dimensionless_system : mpl::false_ {};
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template<class System>
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struct is_dimensionless_system<System, typename void_if_dimensionless<System>::type> : mpl::true_ {};
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#define BOOST_UNITS_DIMENSIONLESS_UNIT(T)\
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boost::units::unit<\
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boost::units::dimensionless_type,\
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T,\
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typename ::boost::units::detail::void_if_dimensionless<T>::type\
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>
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#define BOOST_UNITS_HETEROGENEOUS_DIMENSIONLESS_UNIT(T)\
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boost::units::unit<\
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boost::units::dimensionless_type,\
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T,\
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typename ::boost::units::detail::void_if_heterogeneous<T>::type\
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>
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}
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}
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}
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#endif
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