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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) 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) // $Id: lambda.hpp 27 2008-06-16 14:50:58Z maehne $ #ifndef BOOST_UNITS_LAMBDA_HPP #define BOOST_UNITS_LAMBDA_HPP //////////////////////////////////////////////////////////////////////// /// /// \file lambda.hpp /// /// \brief Definitions to ease the usage of Boost.Units' quantity, /// unit, and absolute types in functors created with the /// Boost.Lambda library. /// /// \author Torsten Maehne /// \date 2008-06-16 /// /// Boost.Lambda's return type deduction system is extented to make /// use of Boost.Units' typeof_helper trait classes for Boost.Units' /// quantity, absolute, and unit template classes. /// //////////////////////////////////////////////////////////////////////// #include <boost/lambda/lambda.hpp> #include <boost/units/units_fwd.hpp> #include <boost/units/detail/dimensionless_unit.hpp> #include <boost/units/operators.hpp> namespace boost { namespace lambda { /// Partial specialization of return type trait for action /// unit<Dim, System> * Y. template<typename System, typename Dim, typename Y> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::unit<Dim, System>, Y > { typedef typename boost::units::multiply_typeof_helper< boost::units::unit<Dim, System>, Y >::type type; }; } // namespace lambda namespace units { template<typename System, typename Dim, typename Arg> struct multiply_typeof_helper<boost::units::unit<Dim, System>, boost::lambda::lambda_functor<Arg> > { typedef boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::arithmetic_action<boost::lambda::multiply_action>, tuple<typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type, boost::lambda::lambda_functor<Arg> > > > type; }; /// Disambiguating overload for action /// unit<Dim, System> * lambda_functor<Arg> /// based on \<boost/lambda/detail/operators.hpp\>. template<typename System, typename Dim, typename Arg> inline const typename multiply_typeof_helper<boost::units::unit<Dim, System>, boost::lambda::lambda_functor<Arg> >::type operator*(const boost::units::unit<Dim, System>& a, const boost::lambda::lambda_functor<Arg>& b) { return typename multiply_typeof_helper<boost::units::unit<Dim, System>, boost::lambda::lambda_functor<Arg> >::type::inherited (tuple<typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type, boost::lambda::lambda_functor<Arg> > (a, b)); } } // namespace units namespace lambda { /// Partial specialization of return type trait for action /// unit<Dim, System> / Y. template<typename System, typename Dim, typename Y> struct plain_return_type_2<arithmetic_action<divide_action>, boost::units::unit<Dim, System>, Y > { typedef typename boost::units::divide_typeof_helper< boost::units::unit<Dim, System>, Y >::type type; }; } // namespace lambda namespace units { template<typename System, typename Dim, typename Arg> struct divide_typeof_helper<boost::units::unit<Dim, System>, boost::lambda::lambda_functor<Arg> > { typedef boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::arithmetic_action<boost::lambda::divide_action>, tuple<typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type, boost::lambda::lambda_functor<Arg> > > > type; }; /// Disambiguating overload for action /// unit<Dim, System> / lambda_functor<Arg> /// based on \<boost/lambda/detail/operators.hpp\>. template<typename System, typename Dim, typename Arg> inline const typename divide_typeof_helper<boost::units::unit<Dim, System>, boost::lambda::lambda_functor<Arg> >::type operator/(const boost::units::unit<Dim, System>& a, const boost::lambda::lambda_functor<Arg>& b) { return typename divide_typeof_helper<boost::units::unit<Dim, System>, boost::lambda::lambda_functor<Arg> >::type::inherited (tuple<typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type, boost::lambda::lambda_functor<Arg> > (a, b)); } } // namespace units namespace lambda { /// Partial specialization of return type trait for action /// Y * unit<Dim, System>. template<typename System, typename Dim, typename Y> struct plain_return_type_2<arithmetic_action<multiply_action>, Y, boost::units::unit<Dim, System> > { typedef typename boost::units::multiply_typeof_helper< Y, boost::units::unit<Dim, System> >::type type; }; } // namespace lambda namespace units { template<typename System, typename Dim, typename Arg> struct multiply_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::unit<Dim, System> > { typedef boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::arithmetic_action<boost::lambda::multiply_action>, tuple<boost::lambda::lambda_functor<Arg>, typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type> > > type; }; /// Disambiguating overload for action /// lambda_functor<Arg> * unit<Dim, System> /// based on \<boost/lambda/detail/operators.hpp\>. template<typename System, typename Dim, typename Arg> inline const typename multiply_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::unit<Dim, System> >::type operator*(const boost::lambda::lambda_functor<Arg>& a, const boost::units::unit<Dim, System>& b) { return typename multiply_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::unit<Dim, System> >::type::inherited (tuple<boost::lambda::lambda_functor<Arg>, typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type> (a, b)); } } // namespace units namespace lambda { /// Partial specialization of return type trait for action /// Y / unit<Dim, System>. template<typename System, typename Dim, typename Y> struct plain_return_type_2<arithmetic_action<divide_action>, Y, boost::units::unit<Dim, System> > { typedef typename boost::units::divide_typeof_helper< Y, boost::units::unit<Dim, System> >::type type; }; } // namespace lambda namespace units { template<typename System, typename Dim, typename Arg> struct divide_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::unit<Dim, System> > { typedef boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::arithmetic_action<boost::lambda::divide_action>, tuple<boost::lambda::lambda_functor<Arg>, typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type> > > type; }; /// Disambiguating overload for action /// lambda_functor<Arg> / unit<Dim, System> /// based on \<boost/lambda/detail/operators.hpp\>. template<typename System, typename Dim, typename Arg> inline const typename divide_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::unit<Dim, System> >::type operator/(const boost::lambda::lambda_functor<Arg>& a, const boost::units::unit<Dim, System>& b) { return typename divide_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::unit<Dim, System> >::type::inherited (tuple<boost::lambda::lambda_functor<Arg>, typename boost::lambda::const_copy_argument<const boost::units::unit<Dim, System> >::type> (a, b)); } } // namespace units namespace lambda { /// Partial specialization of return type trait for action /// quantity<Unit, X> * X. template<typename Unit, typename X> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::quantity<Unit, X>, X> { typedef typename boost::units::multiply_typeof_helper< boost::units::quantity<Unit, X>, X>::type type; }; /// Partial specialization of return type trait for action /// X * quantity<Unit, X>. template<typename Unit, typename X> struct plain_return_type_2<arithmetic_action<multiply_action>, X, boost::units::quantity<Unit, X> > { typedef typename boost::units::multiply_typeof_helper< X, boost::units::quantity<Unit, X> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit, X> / X. template<typename Unit, typename X> struct plain_return_type_2<arithmetic_action<divide_action>, boost::units::quantity<Unit, X>, X> { typedef typename boost::units::divide_typeof_helper< boost::units::quantity<Unit, X>, X>::type type; }; /// Partial specialization of return type trait for action /// X / quantity<Unit, X>. template<typename Unit, typename X> struct plain_return_type_2<arithmetic_action<divide_action>, X, boost::units::quantity<Unit, X> > { typedef typename boost::units::divide_typeof_helper< X, boost::units::quantity<Unit, X> >::type type; }; /// Partial specialization of return type trait for action /// unit<Dim1, System1> * quantity<Unit2, Y>. template<typename System1, typename Dim1, typename Unit2, typename Y> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::unit<Dim1, System1>, boost::units::quantity<Unit2, Y> > { typedef typename boost::units::multiply_typeof_helper< boost::units::unit<Dim1, System1>, boost::units::quantity<Unit2, Y> >::type type; }; /// Partial specialization of return type trait for action /// unit<Dim1, System1> / quantity<Unit2, Y>. template<typename System1, typename Dim1, typename Unit2, typename Y> struct plain_return_type_2<arithmetic_action<divide_action>, boost::units::unit<Dim1, System1>, boost::units::quantity<Unit2, Y> > { typedef typename boost::units::divide_typeof_helper< boost::units::unit<Dim1, System1>, boost::units::quantity<Unit2, Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit1, Y> * unit<Dim2, System2>. template<typename Unit1, typename Y, typename System2, typename Dim2> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::quantity<Unit1, Y>, boost::units::unit<Dim2, System2> > { typedef typename boost::units::multiply_typeof_helper< boost::units::quantity<Unit1, Y>, boost::units::unit<Dim2, System2> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit1, Y> / unit<Dim2, System2>. template<typename Unit1, typename Y, typename System2, typename Dim2> struct plain_return_type_2<arithmetic_action<divide_action>, boost::units::quantity<Unit1, Y>, boost::units::unit<Dim2, System2> > { typedef typename boost::units::divide_typeof_helper< boost::units::quantity<Unit1, Y>, boost::units::unit<Dim2, System2> >::type type; }; /// Partial specialization of return type trait for action /// +quantity<Unit, Y>. template<typename Unit, typename Y> struct plain_return_type_1<unary_arithmetic_action<plus_action>, boost::units::quantity<Unit, Y> > { typedef typename boost::units::unary_plus_typeof_helper< boost::units::quantity<Unit, Y> >::type type; }; /// Partial specialization of return type trait for action /// -quantity<Unit, Y>. template<typename Unit, typename Y> struct plain_return_type_1<unary_arithmetic_action<minus_action>, boost::units::quantity<Unit, Y> > { typedef typename boost::units::unary_minus_typeof_helper< boost::units::quantity<Unit, Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit1, X> + quantity<Unit2, Y>. template<typename Unit1, typename X, typename Unit2, typename Y> struct plain_return_type_2<arithmetic_action<plus_action>, boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> > { typedef typename boost::units::add_typeof_helper< boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<dimensionless, X> + Y. template<typename System, typename X, typename Y> struct plain_return_type_2<arithmetic_action<plus_action>, boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), X>, Y> { typedef typename boost::units::add_typeof_helper< boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), X>, Y>::type type; }; /// Partial specialization of return type trait for action /// X + quantity<dimensionless, Y>. template<typename System, typename X, typename Y> struct plain_return_type_2<arithmetic_action<plus_action>, X, boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y> > { typedef typename boost::units::add_typeof_helper< X, boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit1, X> - quantity<Unit2, Y>. template<typename Unit1, typename X, typename Unit2, typename Y> struct plain_return_type_2<arithmetic_action<minus_action>, boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> > { typedef typename boost::units::subtract_typeof_helper< boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<dimensionless, X> - Y. template<typename System, typename X, typename Y> struct plain_return_type_2<arithmetic_action<minus_action>, boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), X>, Y> { typedef typename boost::units::subtract_typeof_helper< boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), X>, Y>::type type; }; /// Partial specialization of return type trait for action /// X - quantity<dimensionless, Y>. template<typename System, typename X, typename Y> struct plain_return_type_2<arithmetic_action<minus_action>, X, boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y> > { typedef typename boost::units::subtract_typeof_helper< X, boost::units::quantity<BOOST_UNITS_DIMENSIONLESS_UNIT(System), Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit1, X> * quantity<Unit2, Y>. template<typename Unit1, typename X, typename Unit2, typename Y> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> > { typedef typename boost::units::multiply_typeof_helper< boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> >::type type; }; /// Partial specialization of return type trait for action /// quantity<Unit1, X> / quantity<Unit2, Y>. template<typename Unit1, typename X, typename Unit2, typename Y> struct plain_return_type_2<arithmetic_action<divide_action>, boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> > { typedef typename boost::units::divide_typeof_helper< boost::units::quantity<Unit1, X>, boost::units::quantity<Unit2, Y> >::type type; }; //////////////////////////////////////////////////////////////////////// // Partial specialization of Boost.Lambda's trait classes for all // operators overloaded in <boost/units/unit.hpp> //////////////////////////////////////////////////////////////////////// /// Partial specialization of return type trait for action /// +unit<Dim, System>. template<typename Dim, typename System> struct plain_return_type_1<unary_arithmetic_action<plus_action>, boost::units::unit<Dim, System> > { typedef typename boost::units::unary_plus_typeof_helper< boost::units::unit<Dim, System> >::type type; }; /// Partial specialization of return type trait for action /// -unit<Dim, System>. template<typename Dim, typename System> struct plain_return_type_1<unary_arithmetic_action<minus_action>, boost::units::unit<Dim, System> > { typedef typename boost::units::unary_minus_typeof_helper< boost::units::unit<Dim, System> >::type type; }; /// Partial specialization of return type trait for action /// unit<Dim1, System1> + unit<Dim2, System2>. template<typename Dim1, typename Dim2, typename System1, typename System2> struct plain_return_type_2<arithmetic_action<plus_action>, boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> > { typedef typename boost::units::add_typeof_helper< boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> >::type type; }; /// Partial specialization of return type trait for action /// unit<Dim1, System1> - unit<Dim2, System2>. template<typename Dim1, typename Dim2, typename System1, typename System2> struct plain_return_type_2<arithmetic_action<minus_action>, boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> > { typedef typename boost::units::subtract_typeof_helper< boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> >::type type; }; /// Partial specialization of return type trait for action /// unit<Dim1, System1> * unit<Dim2, System2>. template<typename Dim1, typename Dim2, typename System1, typename System2> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> > { typedef typename boost::units::multiply_typeof_helper< boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> >::type type; }; /// Partial specialization of return type trait for action /// unit<Dim1, System1> / unit<Dim2, System2>. template<typename Dim1, typename Dim2, typename System1, typename System2> struct plain_return_type_2<arithmetic_action<divide_action>, boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> > { typedef typename boost::units::divide_typeof_helper< boost::units::unit<Dim1, System1>, boost::units::unit<Dim2, System2> >::type type; }; //////////////////////////////////////////////////////////////////////// // Partial specialization of Boost.Lambda's trait classes for all // operators overloaded in <boost/units/absolute.hpp> //////////////////////////////////////////////////////////////////////// /// Partial specialization of return type trait for action /// absolute<Y> + Y. template<typename Y> struct plain_return_type_2<arithmetic_action<plus_action>, boost::units::absolute<Y>, Y> { typedef typename boost::units::absolute<Y> type; }; /// Partial specialization of return type trait for action /// Y + absolute<Y>. template<typename Y> struct plain_return_type_2<arithmetic_action<plus_action>, Y, boost::units::absolute<Y> > { typedef typename boost::units::absolute<Y> type; }; /// Partial specialization of return type trait for action /// absolute<Y> - Y. template<typename Y> struct plain_return_type_2<arithmetic_action<minus_action>, boost::units::absolute<Y>, Y> { typedef typename boost::units::absolute<Y> type; }; /// Partial specialization of return type trait for action /// absolute<Y> - absolute<Y>. template<typename Y> struct plain_return_type_2<arithmetic_action<minus_action>, boost::units::absolute<Y>, boost::units::absolute<Y> > { typedef Y type; }; /// Partial specialization of return type trait for action /// T * absolute<unit<D, S> >. template<typename D, typename S, typename T> struct plain_return_type_2<arithmetic_action<multiply_action>, T, boost::units::absolute<boost::units::unit<D, S> > > { typedef typename boost::units::quantity< boost::units::absolute<boost::units::unit<D, S> >, T> type; }; } // namespace lambda namespace units { template<typename System, typename Dim, typename Arg> struct multiply_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::absolute<boost::units::unit<Dim, System> > > { typedef boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::arithmetic_action<boost::lambda::multiply_action>, tuple<boost::lambda::lambda_functor<Arg>, typename boost::lambda::const_copy_argument<const boost::units::absolute<boost::units::unit<Dim, System> > >::type> > > type; }; /// Disambiguating overload for action /// lambda_functor<Arg> * absolute<unit<Dim, System> > /// based on \<boost/lambda/detail/operators.hpp\>. template<typename System, typename Dim, typename Arg> inline const typename multiply_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::absolute<boost::units::unit<Dim, System> > >::type operator*(const boost::lambda::lambda_functor<Arg>& a, const boost::units::absolute<boost::units::unit<Dim, System> >& b) { return typename multiply_typeof_helper<boost::lambda::lambda_functor<Arg>, boost::units::absolute<boost::units::unit<Dim, System> > >::type::inherited (tuple<boost::lambda::lambda_functor<Arg>, typename boost::lambda::const_copy_argument<const boost::units::absolute<boost::units::unit<Dim, System> > >::type> (a, b)); } } // namespace units namespace lambda { /// Partial specialization of return type trait for action /// absolute<unit<D, S> > * T. template<typename D, typename S, typename T> struct plain_return_type_2<arithmetic_action<multiply_action>, boost::units::absolute<boost::units::unit<D, S> >, T> { typedef typename boost::units::quantity< boost::units::absolute<boost::units::unit<D, S> >, T> type; }; } // namespace lambda namespace units { template<typename System, typename Dim, typename Arg> struct multiply_typeof_helper<boost::units::absolute<boost::units::unit<Dim, System> >, boost::lambda::lambda_functor<Arg> > { typedef boost::lambda::lambda_functor< boost::lambda::lambda_functor_base< boost::lambda::arithmetic_action<boost::lambda::multiply_action>, tuple<typename boost::lambda::const_copy_argument<const boost::units::absolute<boost::units::unit<Dim, System> > >::type, boost::lambda::lambda_functor<Arg> > > > type; }; /// Disambiguating overload for action /// absolute<unit<Dim, System> > * lambda_functor<Arg> /// based on \<boost/lambda/detail/operators.hpp\>. template<typename System, typename Dim, typename Arg> inline const typename multiply_typeof_helper<boost::units::absolute<boost::units::unit<Dim, System> >, boost::lambda::lambda_functor<Arg> >::type operator*(const boost::units::absolute<boost::units::unit<Dim, System> >& a, const boost::lambda::lambda_functor<Arg>& b) { return typename multiply_typeof_helper<boost::units::absolute<boost::units::unit<Dim, System> >, boost::lambda::lambda_functor<Arg> >::type::inherited (tuple<typename boost::lambda::const_copy_argument<const boost::units::absolute<boost::units::unit<Dim, System> > >::type, boost::lambda::lambda_functor<Arg> > (a, b)); } } // namespace units } // namespace boost #endif // BOOST_UNITS_LAMBDA_HPP