441 lines
13 KiB
Plaintext
441 lines
13 KiB
Plaintext
// 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) 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_UNIT_HPP
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#define BOOST_UNITS_UNIT_HPP
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#include <boost/static_assert.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/units/config.hpp>
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#include <boost/units/dimension.hpp>
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#include <boost/units/operators.hpp>
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#include <boost/units/units_fwd.hpp>
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#include <boost/units/homogeneous_system.hpp>
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#include <boost/units/heterogeneous_system.hpp>
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#include <boost/units/is_dimension_list.hpp>
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#include <boost/units/reduce_unit.hpp>
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#include <boost/units/static_rational.hpp>
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namespace boost {
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namespace units {
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/// class representing a model-dependent unit with no associated value
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/// (e.g. meters, Kelvin, feet, etc...)
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template<class Dim,class System, class Enable>
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class unit
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{
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public:
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typedef unit<Dim, System> unit_type;
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typedef unit<Dim,System> this_type;
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typedef Dim dimension_type;
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typedef System system_type;
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unit() { }
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unit(const this_type&) { }
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//~unit() { }
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this_type& operator=(const this_type&) { return *this; }
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// sun will ignore errors resulting from templates
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// instantiated in the return type of a function.
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// Make sure that we get an error anyway by putting.
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// the check in the destructor.
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#ifdef __SUNPRO_CC
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~unit() {
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BOOST_MPL_ASSERT((detail::check_system<System, Dim>));
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BOOST_MPL_ASSERT((is_dimension_list<Dim>));
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}
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#else
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private:
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BOOST_MPL_ASSERT((detail::check_system<System, Dim>));
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BOOST_MPL_ASSERT((is_dimension_list<Dim>));
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#endif
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};
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}
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}
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#if BOOST_UNITS_HAS_BOOST_TYPEOF
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#include BOOST_TYPEOF_INCREMENT_REGISTRATION_GROUP()
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BOOST_TYPEOF_REGISTER_TEMPLATE(boost::units::unit, 2)
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#endif
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namespace boost {
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namespace units {
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/// Returns a unique type for every unit.
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template<class Dim, class System>
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struct reduce_unit<unit<Dim, System> >
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{
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typedef unit<
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Dim,
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typename detail::make_heterogeneous_system<
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Dim,
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System
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>::type
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> type;
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};
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/// INTERNAL ONLY
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template<class S1,class S2>
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struct is_implicitly_convertible :
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boost::is_same<typename reduce_unit<S1>::type, typename reduce_unit<S2>::type>
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{ };
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/// unit unary plus typeof helper
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/// INTERNAL ONLY
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template<class Dim,class System>
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struct unary_plus_typeof_helper< unit<Dim,System> >
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{
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typedef unit<Dim,System> type;
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};
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/// unit unary minus typeof helper
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/// INTERNAL ONLY
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template<class Dim,class System>
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struct unary_minus_typeof_helper< unit<Dim,System> >
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{
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typedef unit<Dim,System> type;
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};
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/// unit add typeof helper
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/// INTERNAL ONLY
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template<class Dim,
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class System>
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struct add_typeof_helper< unit<Dim,System>,unit<Dim,System> >
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{
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typedef unit<Dim,System> type;
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};
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/// unit subtract typeof helper
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/// INTERNAL ONLY
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template<class Dim,
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class System>
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struct subtract_typeof_helper< unit<Dim,System>,unit<Dim,System> >
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{
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typedef unit<Dim,System> type;
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};
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/// unit multiply typeof helper for two identical homogeneous systems
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System>
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struct multiply_typeof_helper< unit<Dim1,homogeneous_system<System> >,
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unit<Dim2,homogeneous_system<System> > >
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{
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typedef unit<typename mpl::times<Dim1,Dim2>::type,homogeneous_system<System> > type;
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};
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/// unit multiply typeof helper for two different homogeneous systems
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct multiply_typeof_helper< unit<Dim1,homogeneous_system<System1> >,
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unit<Dim2,homogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::times<Dim1,Dim2>::type,
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typename detail::multiply_systems<
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typename detail::make_heterogeneous_system<Dim1, System1>::type,
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typename detail::make_heterogeneous_system<Dim2, System2>::type
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>::type
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> type;
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};
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/// unit multiply typeof helper for a heterogeneous and a homogeneous system
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct multiply_typeof_helper< unit<Dim1,heterogeneous_system<System1> >,
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unit<Dim2,homogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::times<Dim1,Dim2>::type,
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typename detail::multiply_systems<
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heterogeneous_system<System1>,
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typename detail::make_heterogeneous_system<Dim2, System2>::type
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>::type
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> type;
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};
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/// unit multiply typeof helper for a homogeneous and a heterogeneous system
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct multiply_typeof_helper< unit<Dim1,homogeneous_system<System1> >,
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unit<Dim2,heterogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::times<Dim1,Dim2>::type,
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typename detail::multiply_systems<
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typename detail::make_heterogeneous_system<Dim1, System1>::type,
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heterogeneous_system<System2>
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>::type
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> type;
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};
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/// unit multiply typeof helper for two heterogeneous systems
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct multiply_typeof_helper< unit<Dim1,heterogeneous_system<System1> >,
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unit<Dim2,heterogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::times<Dim1,Dim2>::type,
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typename detail::multiply_systems<
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heterogeneous_system<System1>,
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heterogeneous_system<System2>
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>::type
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> type;
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};
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/// unit divide typeof helper for two identical homogeneous systems
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System>
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struct divide_typeof_helper< unit<Dim1,homogeneous_system<System> >,
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unit<Dim2,homogeneous_system<System> > >
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{
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typedef unit<typename mpl::divides<Dim1,Dim2>::type,homogeneous_system<System> > type;
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};
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/// unit divide typeof helper for two different homogeneous systems
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct divide_typeof_helper< unit<Dim1,homogeneous_system<System1> >,
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unit<Dim2,homogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::divides<Dim1,Dim2>::type,
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typename detail::divide_systems<
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typename detail::make_heterogeneous_system<Dim1, System1>::type,
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typename detail::make_heterogeneous_system<Dim2, System2>::type
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>::type
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> type;
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};
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/// unit divide typeof helper for a heterogeneous and a homogeneous system
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct divide_typeof_helper< unit<Dim1,heterogeneous_system<System1> >,
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unit<Dim2,homogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::divides<Dim1,Dim2>::type,
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typename detail::divide_systems<
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heterogeneous_system<System1>,
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typename detail::make_heterogeneous_system<Dim2, System2>::type
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>::type
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> type;
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};
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/// unit divide typeof helper for a homogeneous and a heterogeneous system
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct divide_typeof_helper< unit<Dim1,homogeneous_system<System1> >,
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unit<Dim2,heterogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::divides<Dim1,Dim2>::type,
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typename detail::divide_systems<
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typename detail::make_heterogeneous_system<Dim1, System1>::type,
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heterogeneous_system<System2>
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>::type
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> type;
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};
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/// unit divide typeof helper for two heterogeneous systems
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/// INTERNAL ONLY
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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struct divide_typeof_helper< unit<Dim1,heterogeneous_system<System1> >,
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unit<Dim2,heterogeneous_system<System2> > >
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{
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typedef unit<
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typename mpl::divides<Dim1,Dim2>::type,
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typename detail::divide_systems<
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heterogeneous_system<System1>,
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heterogeneous_system<System2>
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>::type
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> type;
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};
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/// raise unit to a @c static_rational power
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template<class Dim,class System,long N,long D>
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struct power_typeof_helper<unit<Dim,System>,static_rational<N,D> >
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{
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typedef unit<typename static_power<Dim,static_rational<N,D> >::type,typename static_power<System, static_rational<N,D> >::type> type;
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static type value(const unit<Dim,System>&)
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{
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return type();
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}
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};
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/// take the @c static_rational root of a unit
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template<class Dim,class System,long N,long D>
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struct root_typeof_helper<unit<Dim,System>,static_rational<N,D> >
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{
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typedef unit<typename static_root<Dim,static_rational<N,D> >::type,typename static_root<System, static_rational<N,D> >::type> type;
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static type value(const unit<Dim,System>&)
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{
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return type();
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}
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};
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/// unit runtime unary plus
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template<class Dim,class System>
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typename unary_plus_typeof_helper< unit<Dim,System> >::type
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operator+(const unit<Dim,System>&)
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{
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typedef typename unary_plus_typeof_helper< unit<Dim,System> >::type type;
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return type();
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}
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/// unit runtime unary minus
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template<class Dim,class System>
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typename unary_minus_typeof_helper< unit<Dim,System> >::type
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operator-(const unit<Dim,System>&)
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{
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typedef typename unary_minus_typeof_helper< unit<Dim,System> >::type type;
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return type();
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}
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/// runtime add two units
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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typename add_typeof_helper< unit<Dim1,System1>,
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unit<Dim2,System2> >::type
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operator+(const unit<Dim1,System1>&,const unit<Dim2,System2>&)
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{
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BOOST_STATIC_ASSERT((boost::is_same<System1,System2>::value == true));
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typedef System1 system_type;
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typedef typename add_typeof_helper< unit<Dim1,system_type>,
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unit<Dim2,system_type> >::type type;
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return type();
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}
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/// runtime subtract two units
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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typename subtract_typeof_helper< unit<Dim1,System1>,
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unit<Dim2,System2> >::type
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operator-(const unit<Dim1,System1>&,const unit<Dim2,System2>&)
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{
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BOOST_STATIC_ASSERT((boost::is_same<System1,System2>::value == true));
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typedef System1 system_type;
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typedef typename subtract_typeof_helper< unit<Dim1,system_type>,
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unit<Dim2,system_type> >::type type;
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return type();
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}
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/// runtime multiply two units
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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typename multiply_typeof_helper< unit<Dim1,System1>,
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unit<Dim2,System2> >::type
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operator*(const unit<Dim1,System1>&,const unit<Dim2,System2>&)
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{
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typedef typename multiply_typeof_helper< unit<Dim1,System1>,
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unit<Dim2,System2> >::type type;
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return type();
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}
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/// runtime divide two units
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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typename divide_typeof_helper< unit<Dim1,System1>,
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unit<Dim2,System2> >::type
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operator/(const unit<Dim1,System1>&,const unit<Dim2,System2>&)
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{
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typedef typename divide_typeof_helper< unit<Dim1,System1>,
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unit<Dim2,System2> >::type type;
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return type();
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}
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/// unit runtime @c operator==
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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inline
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bool
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operator==(const unit<Dim1,System1>&,const unit<Dim2,System2>&)
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{
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return boost::is_same<typename reduce_unit<unit<Dim1,System1> >::type, typename reduce_unit<unit<Dim2,System2> >::type>::value;
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}
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/// unit runtime @c operator!=
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template<class Dim1,
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class Dim2,
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class System1,
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class System2>
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inline
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bool
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operator!=(const unit<Dim1,System1>&,const unit<Dim2,System2>&)
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{
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return !boost::is_same<typename reduce_unit<unit<Dim1,System1> >::type, typename reduce_unit<unit<Dim2,System2> >::type>::value;
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}
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} // namespace units
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} // namespace boost
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#endif // BOOST_UNITS_UNIT_HPP
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