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164 lines
6.1 KiB
164 lines
6.1 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) 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_OPERATORS_HPP |
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#define BOOST_UNITS_OPERATORS_HPP |
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/// |
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/// \file |
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/// \brief Compile time operators and typeof helper classes. |
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/// \details |
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/// These operators declare the compile-time operators needed to support dimensional |
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/// analysis algebra. They require the use of Boost.Typeof, emulation or native. |
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/// Typeof helper classes define result type for heterogeneous operators on value types. |
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/// These must be defined through specialization for powers and roots. |
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/// |
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#include <boost/static_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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namespace boost { |
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namespace units { |
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#if BOOST_UNITS_HAS_TYPEOF |
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#ifndef BOOST_UNITS_DOXYGEN |
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// to avoid need for default constructor and eliminate divide by zero errors. |
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namespace typeof_ { |
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/// INTERNAL ONLY |
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template<class T> T make(); |
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} // namespace typeof_ |
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#endif |
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#if (BOOST_UNITS_HAS_BOOST_TYPEOF) |
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template<typename X> struct unary_plus_typeof_helper |
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{ |
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, (+typeof_::make<X>())) |
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typedef typename nested::type type; |
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}; |
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template<typename X> struct unary_minus_typeof_helper |
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{ |
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, (-typeof_::make<X>())) |
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typedef typename nested::type type; |
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}; |
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template<typename X,typename Y> struct add_typeof_helper |
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{ |
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, (typeof_::make<X>()+typeof_::make<Y>())) |
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typedef typename nested::type type; |
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}; |
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template<typename X,typename Y> struct subtract_typeof_helper |
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{ |
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, (typeof_::make<X>()-typeof_::make<Y>())) |
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typedef typename nested::type type; |
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}; |
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template<typename X,typename Y> struct multiply_typeof_helper |
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{ |
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, (typeof_::make<X>()*typeof_::make<Y>())) |
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typedef typename nested::type type; |
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}; |
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template<typename X,typename Y> struct divide_typeof_helper |
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{ |
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BOOST_TYPEOF_NESTED_TYPEDEF_TPL(nested, (typeof_::make<X>()/typeof_::make<Y>())) |
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typedef typename nested::type type; |
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}; |
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#elif (BOOST_UNITS_HAS_MWERKS_TYPEOF) |
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template<typename X> struct unary_plus_typeof_helper { typedef __typeof__((+typeof_::make<X>())) type; }; |
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template<typename X> struct unary_minus_typeof_helper { typedef __typeof__((-typeof_::make<X>())) type; }; |
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template<typename X,typename Y> struct add_typeof_helper { typedef __typeof__((typeof_::make<X>()+typeof_::make<Y>())) type; }; |
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template<typename X,typename Y> struct subtract_typeof_helper { typedef __typeof__((typeof_::make<X>()-typeof_::make<Y>())) type; }; |
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template<typename X,typename Y> struct multiply_typeof_helper { typedef __typeof__((typeof_::make<X>()*typeof_::make<Y>())) type; }; |
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template<typename X,typename Y> struct divide_typeof_helper { typedef __typeof__((typeof_::make<X>()/typeof_::make<Y>())) type; }; |
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#elif (BOOST_UNITS_HAS_GNU_TYPEOF) || defined(BOOST_UNITS_DOXYGEN) |
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template<typename X> struct unary_plus_typeof_helper { typedef typeof((+typeof_::make<X>())) type; }; |
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template<typename X> struct unary_minus_typeof_helper { typedef typeof((-typeof_::make<X>())) type; }; |
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template<typename X,typename Y> struct add_typeof_helper { typedef typeof((typeof_::make<X>()+typeof_::make<Y>())) type; }; |
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template<typename X,typename Y> struct subtract_typeof_helper { typedef typeof((typeof_::make<X>()-typeof_::make<Y>())) type; }; |
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template<typename X,typename Y> struct multiply_typeof_helper { typedef typeof((typeof_::make<X>()*typeof_::make<Y>())) type; }; |
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template<typename X,typename Y> struct divide_typeof_helper { typedef typeof((typeof_::make<X>()/typeof_::make<Y>())) type; }; |
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#endif |
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#else // BOOST_UNITS_HAS_TYPEOF |
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template<typename X> struct unary_plus_typeof_helper { typedef X type; }; |
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template<typename X> struct unary_minus_typeof_helper { typedef X type; }; |
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template<typename X,typename Y> struct add_typeof_helper { BOOST_STATIC_ASSERT((is_same<X,Y>::value == true)); typedef X type; }; |
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template<typename X,typename Y> struct subtract_typeof_helper { BOOST_STATIC_ASSERT((is_same<X,Y>::value == true)); typedef X type; }; |
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template<typename X,typename Y> struct multiply_typeof_helper { BOOST_STATIC_ASSERT((is_same<X,Y>::value == true)); typedef X type; }; |
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template<typename X,typename Y> struct divide_typeof_helper { BOOST_STATIC_ASSERT((is_same<X,Y>::value == true)); typedef X type; }; |
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#endif // BOOST_UNITS_HAS_TYPEOF |
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template<typename X,typename Y> struct power_typeof_helper; |
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template<typename X,typename Y> struct root_typeof_helper; |
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#ifdef BOOST_UNITS_DOXYGEN |
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/// A helper used by @c pow to raise |
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/// a runtime object to a compile time |
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/// known exponent. This template is intended to |
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/// be specialized. All specializations must |
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/// conform to the interface shown here. |
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/// @c Exponent will be either the exponent |
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/// passed to @c pow or @c static_rational<N> |
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/// for and integer argument, N. |
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template<typename BaseType, typename Exponent> |
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struct power_typeof_helper |
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{ |
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/// specifies the result type |
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typedef detail::unspecified type; |
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/// Carries out the runtime calculation. |
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static type value(const BaseType& base); |
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}; |
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/// A helper used by @c root to take a root |
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/// of a runtime object using a compile time |
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/// known index. This template is intended to |
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/// be specialized. All specializations must |
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/// conform to the interface shown here. |
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/// @c Index will be either the type |
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/// passed to @c pow or @c static_rational<N> |
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/// for and integer argument, N. |
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template<typename Radicand, typename Index> |
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struct root_typeof_helper |
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{ |
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/// specifies the result type |
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typedef detail::unspecified type; |
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/// Carries out the runtime calculation. |
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static type value(const Radicand& base); |
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}; |
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#endif |
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} // namespace units |
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} // namespace boost |
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#endif // BOOST_UNITS_OPERATORS_HPP
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