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88 lines
2.2 KiB
88 lines
2.2 KiB
// 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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