165 lines
6.3 KiB
C++
165 lines
6.3 KiB
C++
// 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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