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1225 lines
44 KiB
1225 lines
44 KiB
/////////////////////////////////////////////////////////////////////////////// |
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/// \file traits.hpp |
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/// Contains definitions for child\<\>, child_c\<\>, left\<\>, |
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/// right\<\>, tag_of\<\>, and the helper functions child(), child_c(), |
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/// value(), left() and right(). |
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// |
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// Copyright 2008 Eric Niebler. Distributed under the Boost |
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// Software License, Version 1.0. (See accompanying file |
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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#ifndef BOOST_PROTO_ARG_TRAITS_HPP_EAN_04_01_2005 |
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#define BOOST_PROTO_ARG_TRAITS_HPP_EAN_04_01_2005 |
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#include <boost/config.hpp> |
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#include <boost/detail/workaround.hpp> |
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#include <boost/preprocessor/iteration/iterate.hpp> |
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#include <boost/preprocessor/repetition/enum.hpp> |
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#include <boost/preprocessor/repetition/enum_params.hpp> |
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
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#include <boost/preprocessor/repetition/repeat.hpp> |
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#include <boost/preprocessor/repetition/repeat_from_to.hpp> |
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#include <boost/preprocessor/facilities/intercept.hpp> |
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#include <boost/preprocessor/arithmetic/sub.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/proto/detail/template_arity.hpp> |
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#include <boost/type_traits/is_pod.hpp> |
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#include <boost/type_traits/is_same.hpp> |
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#include <boost/type_traits/add_const.hpp> |
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#include <boost/proto/proto_fwd.hpp> |
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#include <boost/proto/args.hpp> |
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#include <boost/proto/domain.hpp> |
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#include <boost/proto/transform/pass_through.hpp> |
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#if BOOST_WORKAROUND( BOOST_MSVC, >= 1400 ) |
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#pragma warning(push) |
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#pragma warning(disable: 4180) // warning C4180: qualifier applied to function type has no meaning; ignored |
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#endif |
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namespace boost { namespace proto |
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{ |
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namespace detail |
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{ |
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template<typename T, typename Void = void> |
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struct if_vararg |
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{}; |
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template<typename T> |
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struct if_vararg<T, typename T::proto_is_vararg_> |
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: T |
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{}; |
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template<typename T, typename Void = void> |
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struct is_callable2_ |
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: mpl::false_ |
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{}; |
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template<typename T> |
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struct is_callable2_<T, typename T::proto_is_callable_> |
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: mpl::true_ |
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{}; |
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template<typename T BOOST_PROTO_TEMPLATE_ARITY_PARAM(long Arity = boost::proto::detail::template_arity<T>::value)> |
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struct is_callable_ |
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: is_callable2_<T> |
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{}; |
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} |
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/// \brief Boolean metafunction which detects whether a type is |
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/// a callable function object type or not. |
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/// |
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/// <tt>is_callable\<\></tt> is used by the <tt>when\<\></tt> transform |
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/// to determine whether a function type <tt>R(A1,A2,...AN)</tt> is a |
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/// callable transform or an object transform. (The former are evaluated |
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/// using <tt>call\<\></tt> and the later with <tt>make\<\></tt>.) If |
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/// <tt>is_callable\<R\>::value</tt> is \c true, the function type is |
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/// a callable transform; otherwise, it is an object transform. |
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/// |
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/// Unless specialized for a type \c T, <tt>is_callable\<T\>::value</tt> |
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/// is computed as follows: |
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/// |
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/// \li If \c T is a template type <tt>X\<Y0,Y1,...YN\></tt>, where all \c Yx |
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/// are types for \c x in <tt>[0,N]</tt>, <tt>is_callable\<T\>::value</tt> |
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/// is <tt>is_same\<YN, proto::callable\>::value</tt>. |
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/// \li If \c T has a nested type \c proto_is_callable_ that is a typedef |
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/// for \c void, <tt>is_callable\<T\>::value</tt> is \c true. (Note: this is |
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/// the case for any type that derives from \c proto::callable.) |
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/// \li Otherwise, <tt>is_callable\<T\>::value</tt> is \c false. |
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template<typename T> |
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struct is_callable |
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: proto::detail::is_callable_<T> |
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{}; |
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/// INTERNAL ONLY |
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/// |
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template<> |
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struct is_callable<proto::_> |
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: mpl::true_ |
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{}; |
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/// INTERNAL ONLY |
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/// |
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template<> |
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struct is_callable<proto::callable> |
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: mpl::false_ |
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{}; |
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/// INTERNAL ONLY |
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/// |
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template<typename PrimitiveTransform, typename X> |
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struct is_callable<proto::transform<PrimitiveTransform, X> > |
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: mpl::false_ |
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{}; |
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#if BOOST_WORKAROUND(__GNUC__, == 3) || (__GNUC__ == 4 && __GNUC_MINOR__ == 0) |
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// work around GCC bug |
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template<typename Tag, typename Args, long N> |
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struct is_callable<proto::expr<Tag, Args, N> > |
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: mpl::false_ |
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{}; |
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// work around GCC bug |
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template<typename Tag, typename Args, long N> |
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struct is_callable<proto::basic_expr<Tag, Args, N> > |
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: mpl::false_ |
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{}; |
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#endif |
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namespace detail |
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{ |
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template<typename T, typename Void /*= void*/> |
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struct is_transform_ |
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: mpl::false_ |
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{}; |
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template<typename T> |
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struct is_transform_<T, typename T::proto_is_transform_> |
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: mpl::true_ |
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{}; |
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} |
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/// \brief Boolean metafunction which detects whether a type is |
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/// a PrimitiveTransform type or not. |
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/// |
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/// <tt>is_transform\<\></tt> is used by the <tt>call\<\></tt> transform |
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/// to determine whether the function types <tt>R()</tt>, <tt>R(A1)</tt>, |
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/// and <tt>R(A1, A2)</tt> should be passed the expression, state and data |
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/// parameters (as needed). |
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/// |
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/// Unless specialized for a type \c T, <tt>is_transform\<T\>::value</tt> |
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/// is computed as follows: |
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/// |
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/// \li If \c T has a nested type \c proto_is_transform_ that is a typedef |
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/// for \c void, <tt>is_transform\<T\>::value</tt> is \c true. (Note: this is |
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/// the case for any type that derives from an instantiation of \c proto::transform.) |
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/// \li Otherwise, <tt>is_transform\<T\>::value</tt> is \c false. |
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template<typename T> |
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struct is_transform |
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: proto::detail::is_transform_<T> |
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{}; |
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namespace detail |
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{ |
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template<typename T, typename Void /*= void*/> |
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struct is_aggregate_ |
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: is_pod<T> |
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{}; |
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template<typename Tag, typename Args, long N> |
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struct is_aggregate_<proto::expr<Tag, Args, N>, void> |
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: mpl::true_ |
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{}; |
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template<typename Tag, typename Args, long N> |
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struct is_aggregate_<proto::basic_expr<Tag, Args, N>, void> |
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: mpl::true_ |
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{}; |
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template<typename T> |
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struct is_aggregate_<T, typename T::proto_is_aggregate_> |
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: mpl::true_ |
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{}; |
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} |
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/// \brief A Boolean metafunction that indicates whether a type requires |
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/// aggregate initialization. |
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/// |
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/// <tt>is_aggregate\<\></tt> is used by the <tt>make\<\></tt> transform |
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/// to determine how to construct an object of some type \c T, given some |
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/// initialization arguments <tt>a0,a1,...aN</tt>. |
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/// If <tt>is_aggregate\<T\>::value</tt> is \c true, then an object of |
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/// type T will be initialized as <tt>T t = {a0,a1,...aN};</tt>. Otherwise, |
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/// it will be initialized as <tt>T t(a0,a1,...aN)</tt>. |
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template<typename T> |
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struct is_aggregate |
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: proto::detail::is_aggregate_<T> |
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{}; |
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/// \brief A Boolean metafunction that indicates whether a given |
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/// type \c T is a Proto expression type. |
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/// |
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/// If \c T has a nested type \c proto_is_expr_ that is a typedef |
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/// for \c void, <tt>is_expr\<T\>::value</tt> is \c true. (Note, this |
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/// is the case for <tt>proto::expr\<\></tt>, any type that is derived |
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/// from <tt>proto::extends\<\></tt> or that uses the |
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/// <tt>BOOST_PROTO_BASIC_EXTENDS()</tt> macro.) Otherwise, |
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/// <tt>is_expr\<T\>::value</tt> is \c false. |
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template<typename T, typename Void /* = void*/> |
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struct is_expr |
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: mpl::false_ |
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{}; |
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/// \brief A Boolean metafunction that indicates whether a given |
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/// type \c T is a Proto expression type. |
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/// |
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/// If \c T has a nested type \c proto_is_expr_ that is a typedef |
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/// for \c void, <tt>is_expr\<T\>::value</tt> is \c true. (Note, this |
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/// is the case for <tt>proto::expr\<\></tt>, any type that is derived |
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/// from <tt>proto::extends\<\></tt> or that uses the |
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/// <tt>BOOST_PROTO_BASIC_EXTENDS()</tt> macro.) Otherwise, |
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/// <tt>is_expr\<T\>::value</tt> is \c false. |
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template<typename T> |
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struct is_expr<T, typename T::proto_is_expr_> |
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: mpl::true_ |
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{}; |
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template<typename T> |
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struct is_expr<T &, void> |
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: is_expr<T> |
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{}; |
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/// \brief A metafunction that returns the tag type of a |
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/// Proto expression. |
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template<typename Expr> |
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struct tag_of |
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{ |
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typedef typename Expr::proto_tag type; |
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}; |
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template<typename Expr> |
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struct tag_of<Expr &> |
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{ |
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typedef typename Expr::proto_tag type; |
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}; |
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/// \brief A metafunction that returns the arity of a |
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/// Proto expression. |
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template<typename Expr> |
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struct arity_of |
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: Expr::proto_arity |
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{}; |
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template<typename Expr> |
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struct arity_of<Expr &> |
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: Expr::proto_arity |
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{}; |
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namespace result_of |
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{ |
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/// \brief A metafunction that computes the return type of the \c as_expr() |
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/// function. |
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template<typename T, typename Domain /*= default_domain*/> |
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struct as_expr |
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{ |
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typedef typename Domain::template as_expr<T>::result_type type; |
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}; |
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/// \brief A metafunction that computes the return type of the \c as_child() |
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/// function. |
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template<typename T, typename Domain /*= default_domain*/> |
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struct as_child |
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{ |
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typedef typename Domain::template as_child<T>::result_type type; |
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}; |
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/// \brief A metafunction that returns the type of the Nth child |
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/// of a Proto expression, where N is an MPL Integral Constant. |
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/// |
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/// <tt>result_of::child\<Expr, N\></tt> is equivalent to |
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/// <tt>result_of::child_c\<Expr, N::value\></tt>. |
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template<typename Expr, typename N /* = mpl::long_<0>*/> |
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struct child |
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: child_c<Expr, N::value> |
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{}; |
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/// \brief A metafunction that returns the type of the value |
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/// of a terminal Proto expression. |
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/// |
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template<typename Expr> |
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struct value |
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{ |
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/// Verify that we are actually operating on a terminal |
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BOOST_STATIC_ASSERT(0 == Expr::proto_arity_c); |
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/// The raw type of the Nth child as it is stored within |
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/// \c Expr. This may be a value or a reference |
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typedef typename Expr::proto_child0 value_type; |
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/// The "value" type of the child, suitable for storage by value, |
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/// computed as follows: |
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/// \li <tt>T const(&)[N]</tt> becomes <tt>T[N]</tt> |
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/// \li <tt>T[N]</tt> becomes <tt>T[N]</tt> |
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/// \li <tt>T(&)[N]</tt> becomes <tt>T[N]</tt> |
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/// \li <tt>R(&)(A0,...)</tt> becomes <tt>R(&)(A0,...)</tt> |
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/// \li <tt>T const &</tt> becomes <tt>T</tt> |
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/// \li <tt>T &</tt> becomes <tt>T</tt> |
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/// \li <tt>T</tt> becomes <tt>T</tt> |
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typedef typename detail::term_traits<typename Expr::proto_child0>::value_type type; |
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}; |
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template<typename Expr> |
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struct value<Expr &> |
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{ |
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/// Verify that we are actually operating on a terminal |
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BOOST_STATIC_ASSERT(0 == Expr::proto_arity_c); |
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/// The raw type of the Nth child as it is stored within |
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/// \c Expr. This may be a value or a reference |
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typedef typename Expr::proto_child0 value_type; |
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/// The "reference" type of the child, suitable for storage by |
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/// reference, computed as follows: |
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/// \li <tt>T const(&)[N]</tt> becomes <tt>T const(&)[N]</tt> |
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/// \li <tt>T[N]</tt> becomes <tt>T(&)[N]</tt> |
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/// \li <tt>T(&)[N]</tt> becomes <tt>T(&)[N]</tt> |
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/// \li <tt>R(&)(A0,...)</tt> becomes <tt>R(&)(A0,...)</tt> |
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/// \li <tt>T const &</tt> becomes <tt>T const &</tt> |
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/// \li <tt>T &</tt> becomes <tt>T &</tt> |
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/// \li <tt>T</tt> becomes <tt>T &</tt> |
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typedef typename detail::term_traits<typename Expr::proto_child0>::reference type; |
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}; |
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template<typename Expr> |
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struct value<Expr const &> |
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{ |
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/// Verify that we are actually operating on a terminal |
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BOOST_STATIC_ASSERT(0 == Expr::proto_arity_c); |
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/// The raw type of the Nth child as it is stored within |
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/// \c Expr. This may be a value or a reference |
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typedef typename Expr::proto_child0 value_type; |
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/// The "const reference" type of the child, suitable for storage by |
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/// const reference, computed as follows: |
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/// \li <tt>T const(&)[N]</tt> becomes <tt>T const(&)[N]</tt> |
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/// \li <tt>T[N]</tt> becomes <tt>T const(&)[N]</tt> |
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/// \li <tt>T(&)[N]</tt> becomes <tt>T(&)[N]</tt> |
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/// \li <tt>R(&)(A0,...)</tt> becomes <tt>R(&)(A0,...)</tt> |
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/// \li <tt>T const &</tt> becomes <tt>T const &</tt> |
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/// \li <tt>T &</tt> becomes <tt>T &</tt> |
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/// \li <tt>T</tt> becomes <tt>T const &</tt> |
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typedef typename detail::term_traits<typename Expr::proto_child0>::const_reference type; |
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}; |
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/// \brief A metafunction that returns the type of the left child |
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/// of a binary Proto expression. |
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/// |
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/// <tt>result_of::left\<Expr\></tt> is equivalent to |
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/// <tt>result_of::child_c\<Expr, 0\></tt>. |
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template<typename Expr> |
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struct left |
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: child_c<Expr, 0> |
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{}; |
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/// \brief A metafunction that returns the type of the right child |
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/// of a binary Proto expression. |
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/// |
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/// <tt>result_of::right\<Expr\></tt> is equivalent to |
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/// <tt>result_of::child_c\<Expr, 1\></tt>. |
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template<typename Expr> |
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struct right |
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: child_c<Expr, 1> |
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{}; |
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} // namespace result_of |
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/// \brief A metafunction for generating terminal expression types, |
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/// a grammar element for matching terminal expressions, and a |
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/// PrimitiveTransform that returns the current expression unchanged. |
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template<typename T> |
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struct terminal |
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: proto::transform<terminal<T>, int> |
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{ |
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typedef proto::expr<proto::tag::terminal, term<T>, 0> type; |
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typedef proto::basic_expr<proto::tag::terminal, term<T>, 0> proto_grammar; |
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template<typename Expr, typename State, typename Data> |
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struct impl : transform_impl<Expr, State, Data> |
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{ |
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typedef Expr result_type; |
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/// \param e The current expression |
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/// \pre <tt>matches\<Expr, terminal\<T\> \>::value</tt> is \c true. |
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/// \return \c e |
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/// \throw nothrow |
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#ifdef BOOST_PROTO_STRICT_RESULT_OF |
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result_type |
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#else |
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typename impl::expr_param |
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#endif |
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operator ()( |
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typename impl::expr_param e |
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, typename impl::state_param |
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, typename impl::data_param |
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) const |
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{ |
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return e; |
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} |
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}; |
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/// INTERNAL ONLY |
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typedef proto::tag::terminal proto_tag; |
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/// INTERNAL ONLY |
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typedef T proto_child0; |
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}; |
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/// \brief A metafunction for generating ternary conditional expression types, |
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/// a grammar element for matching ternary conditional expressions, and a |
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/// PrimitiveTransform that dispatches to the <tt>pass_through\<\></tt> |
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/// transform. |
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template<typename T, typename U, typename V> |
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struct if_else_ |
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: proto::transform<if_else_<T, U, V>, int> |
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{ |
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typedef proto::expr<proto::tag::if_else_, list3<T, U, V>, 3> type; |
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typedef proto::basic_expr<proto::tag::if_else_, list3<T, U, V>, 3> proto_grammar; |
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: detail::pass_through_impl<if_else_, Expr, State, Data> |
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{}; |
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/// INTERNAL ONLY |
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typedef proto::tag::if_else_ proto_tag; |
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/// INTERNAL ONLY |
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typedef T proto_child0; |
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/// INTERNAL ONLY |
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typedef U proto_child1; |
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/// INTERNAL ONLY |
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typedef V proto_child2; |
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}; |
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/// \brief A metafunction for generating nullary expression types with a |
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/// specified tag type, |
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/// a grammar element for matching nullary expressions, and a |
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/// PrimitiveTransform that returns the current expression unchanged. |
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/// |
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/// Use <tt>nullary_expr\<_, _\></tt> as a grammar element to match any |
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/// nullary expression. |
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template<typename Tag, typename T> |
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struct nullary_expr |
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: proto::transform<nullary_expr<Tag, T>, int> |
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{ |
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typedef proto::expr<Tag, term<T>, 0> type; |
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typedef proto::basic_expr<Tag, term<T>, 0> proto_grammar; |
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|
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template<typename Expr, typename State, typename Data> |
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struct impl : transform_impl<Expr, State, Data> |
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{ |
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typedef Expr result_type; |
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|
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/// \param e The current expression |
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/// \pre <tt>matches\<Expr, nullary_expr\<Tag, T\> \>::value</tt> is \c true. |
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/// \return \c e |
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/// \throw nothrow |
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#ifdef BOOST_PROTO_STRICT_RESULT_OF |
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result_type |
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#else |
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typename impl::expr_param |
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#endif |
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operator ()( |
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typename impl::expr_param e |
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, typename impl::state_param |
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, typename impl::data_param |
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) const |
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{ |
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return e; |
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} |
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}; |
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|
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/// INTERNAL ONLY |
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typedef Tag proto_tag; |
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/// INTERNAL ONLY |
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typedef T proto_child0; |
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}; |
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|
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/// \brief A metafunction for generating unary expression types with a |
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/// specified tag type, |
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/// a grammar element for matching unary expressions, and a |
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/// PrimitiveTransform that dispatches to the <tt>pass_through\<\></tt> |
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/// transform. |
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/// |
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/// Use <tt>unary_expr\<_, _\></tt> as a grammar element to match any |
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/// unary expression. |
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template<typename Tag, typename T> |
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struct unary_expr |
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: proto::transform<unary_expr<Tag, T>, int> |
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{ |
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typedef proto::expr<Tag, list1<T>, 1> type; |
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typedef proto::basic_expr<Tag, list1<T>, 1> proto_grammar; |
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|
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: detail::pass_through_impl<unary_expr, Expr, State, Data> |
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{}; |
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|
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/// INTERNAL ONLY |
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typedef Tag proto_tag; |
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/// INTERNAL ONLY |
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typedef T proto_child0; |
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}; |
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|
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/// \brief A metafunction for generating binary expression types with a |
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/// specified tag type, |
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/// a grammar element for matching binary expressions, and a |
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/// PrimitiveTransform that dispatches to the <tt>pass_through\<\></tt> |
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/// transform. |
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/// |
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/// Use <tt>binary_expr\<_, _, _\></tt> as a grammar element to match any |
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/// binary expression. |
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template<typename Tag, typename T, typename U> |
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struct binary_expr |
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: proto::transform<binary_expr<Tag, T, U>, int> |
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{ |
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typedef proto::expr<Tag, list2<T, U>, 2> type; |
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typedef proto::basic_expr<Tag, list2<T, U>, 2> proto_grammar; |
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|
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template<typename Expr, typename State, typename Data> |
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struct impl |
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: detail::pass_through_impl<binary_expr, Expr, State, Data> |
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{}; |
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|
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/// INTERNAL ONLY |
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typedef Tag proto_tag; |
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/// INTERNAL ONLY |
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typedef T proto_child0; |
|
/// INTERNAL ONLY |
|
typedef U proto_child1; |
|
}; |
|
|
|
#define BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(Op) \ |
|
template<typename T> \ |
|
struct Op \ |
|
: proto::transform<Op<T>, int> \ |
|
{ \ |
|
typedef proto::expr<proto::tag::Op, list1<T>, 1> type; \ |
|
typedef proto::basic_expr<proto::tag::Op, list1<T>, 1> proto_grammar; \ |
|
\ |
|
template<typename Expr, typename State, typename Data> \ |
|
struct impl \ |
|
: detail::pass_through_impl<Op, Expr, State, Data> \ |
|
{}; \ |
|
\ |
|
typedef proto::tag::Op proto_tag; \ |
|
typedef T proto_child0; \ |
|
}; \ |
|
/**/ |
|
|
|
#define BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(Op) \ |
|
template<typename T, typename U> \ |
|
struct Op \ |
|
: proto::transform<Op<T, U>, int> \ |
|
{ \ |
|
typedef proto::expr<proto::tag::Op, list2<T, U>, 2> type; \ |
|
typedef proto::basic_expr<proto::tag::Op, list2<T, U>, 2> proto_grammar; \ |
|
\ |
|
template<typename Expr, typename State, typename Data> \ |
|
struct impl \ |
|
: detail::pass_through_impl<Op, Expr, State, Data> \ |
|
{}; \ |
|
\ |
|
typedef proto::tag::Op proto_tag; \ |
|
typedef T proto_child0; \ |
|
typedef U proto_child1; \ |
|
}; \ |
|
/**/ |
|
|
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(unary_plus) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(negate) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(dereference) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(complement) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(address_of) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(logical_not) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(pre_inc) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(pre_dec) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(post_inc) |
|
BOOST_PROTO_DEFINE_UNARY_METAFUNCTION(post_dec) |
|
|
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(shift_left) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(shift_right) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(multiplies) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(divides) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(modulus) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(plus) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(minus) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(less) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(greater) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(less_equal) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(greater_equal) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(equal_to) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(not_equal_to) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(logical_or) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(logical_and) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(bitwise_or) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(bitwise_and) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(bitwise_xor) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(comma) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(mem_ptr) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(shift_left_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(shift_right_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(multiplies_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(divides_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(modulus_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(plus_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(minus_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(bitwise_or_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(bitwise_and_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(bitwise_xor_assign) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(subscript) |
|
BOOST_PROTO_DEFINE_BINARY_METAFUNCTION(member) |
|
|
|
#undef BOOST_PROTO_DEFINE_UNARY_METAFUNCTION |
|
#undef BOOST_PROTO_DEFINE_BINARY_METAFUNCTION |
|
|
|
#include <boost/proto/detail/traits.hpp> |
|
|
|
namespace functional |
|
{ |
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c as_expr() function. |
|
template<typename Domain /* = default_domain*/> |
|
struct as_expr |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename T> |
|
struct result<This(T)> |
|
{ |
|
typedef typename Domain::template as_expr<T>::result_type type; |
|
}; |
|
|
|
template<typename This, typename T> |
|
struct result<This(T &)> |
|
{ |
|
typedef typename Domain::template as_expr<T>::result_type type; |
|
}; |
|
|
|
/// \brief Wrap an object in a Proto terminal if it isn't a |
|
/// Proto expression already. |
|
/// \param t The object to wrap. |
|
/// \return <tt>proto::as_expr\<Domain\>(t)</tt> |
|
template<typename T> |
|
typename add_const<typename result<as_expr(T &)>::type>::type |
|
operator ()(T &t) const |
|
{ |
|
return typename Domain::template as_expr<T>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename T> |
|
typename add_const<typename result<as_expr(T const &)>::type>::type |
|
operator ()(T const &t) const |
|
{ |
|
return typename Domain::template as_expr<T const>()(t); |
|
} |
|
|
|
#if BOOST_WORKAROUND(BOOST_MSVC, == 1310) |
|
template<typename T, std::size_t N_> |
|
typename add_const<typename result<as_expr(T (&)[N_])>::type>::type |
|
operator ()(T (&t)[N_]) const |
|
{ |
|
return typename Domain::template as_expr<T[N_]>()(t); |
|
} |
|
|
|
template<typename T, std::size_t N_> |
|
typename add_const<typename result<as_expr(T const (&)[N_])>::type>::type |
|
operator ()(T const (&t)[N_]) const |
|
{ |
|
return typename Domain::template as_expr<T const[N_]>()(t); |
|
} |
|
#endif |
|
}; |
|
|
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c as_child() function. |
|
template<typename Domain /* = default_domain*/> |
|
struct as_child |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename T> |
|
struct result<This(T)> |
|
{ |
|
typedef typename Domain::template as_child<T>::result_type type; |
|
}; |
|
|
|
template<typename This, typename T> |
|
struct result<This(T &)> |
|
{ |
|
typedef typename Domain::template as_child<T>::result_type type; |
|
}; |
|
|
|
/// \brief Wrap an object in a Proto terminal if it isn't a |
|
/// Proto expression already. |
|
/// \param t The object to wrap. |
|
/// \return <tt>proto::as_child\<Domain\>(t)</tt> |
|
template<typename T> |
|
typename add_const<typename result<as_child(T &)>::type>::type |
|
operator ()(T &t) const |
|
{ |
|
return typename Domain::template as_child<T>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename T> |
|
typename add_const<typename result<as_child(T const &)>::type>::type |
|
operator ()(T const &t) const |
|
{ |
|
return typename Domain::template as_child<T const>()(t); |
|
} |
|
}; |
|
|
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c child_c() function. |
|
template<long N> |
|
struct child_c |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename Expr> |
|
struct result<This(Expr)> |
|
{ |
|
typedef typename result_of::child_c<Expr, N>::type type; |
|
}; |
|
|
|
/// \brief Return the Nth child of the given expression. |
|
/// \param expr The expression node. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true |
|
/// \pre <tt>N \< Expr::proto_arity::value</tt> |
|
/// \return <tt>proto::child_c\<N\>(expr)</tt> |
|
/// \throw nothrow |
|
template<typename Expr> |
|
typename result_of::child_c<Expr &, N>::type |
|
operator ()(Expr &e) const |
|
{ |
|
return result_of::child_c<Expr &, N>::call(e); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::child_c<Expr const &, N>::type |
|
operator ()(Expr const &e) const |
|
{ |
|
return result_of::child_c<Expr const &, N>::call(e); |
|
} |
|
}; |
|
|
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c child() function. |
|
/// |
|
/// A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c child() function. \c N is required |
|
/// to be an MPL Integral Constant. |
|
template<typename N /* = mpl::long_<0>*/> |
|
struct child |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename Expr> |
|
struct result<This(Expr)> |
|
{ |
|
typedef typename result_of::child<Expr, N>::type type; |
|
}; |
|
|
|
/// \brief Return the Nth child of the given expression. |
|
/// \param expr The expression node. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true |
|
/// \pre <tt>N::value \< Expr::proto_arity::value</tt> |
|
/// \return <tt>proto::child\<N\>(expr)</tt> |
|
/// \throw nothrow |
|
template<typename Expr> |
|
typename result_of::child<Expr &, N>::type |
|
operator ()(Expr &e) const |
|
{ |
|
return result_of::child<Expr &, N>::call(e); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::child<Expr const &, N>::type |
|
operator ()(Expr const &e) const |
|
{ |
|
return result_of::child<Expr const &, N>::call(e); |
|
} |
|
}; |
|
|
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c value() function. |
|
struct value |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename Expr> |
|
struct result<This(Expr)> |
|
{ |
|
typedef typename result_of::value<Expr>::type type; |
|
}; |
|
|
|
/// \brief Return the value of the given terminal expression. |
|
/// \param expr The terminal expression node. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true |
|
/// \pre <tt>0 == Expr::proto_arity::value</tt> |
|
/// \return <tt>proto::value(expr)</tt> |
|
/// \throw nothrow |
|
template<typename Expr> |
|
typename result_of::value<Expr &>::type |
|
operator ()(Expr &e) const |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::value<Expr const &>::type |
|
operator ()(Expr const &e) const |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
}; |
|
|
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c left() function. |
|
struct left |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename Expr> |
|
struct result<This(Expr)> |
|
{ |
|
typedef typename result_of::left<Expr>::type type; |
|
}; |
|
|
|
/// \brief Return the left child of the given binary expression. |
|
/// \param expr The expression node. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true |
|
/// \pre <tt>2 == Expr::proto_arity::value</tt> |
|
/// \return <tt>proto::left(expr)</tt> |
|
/// \throw nothrow |
|
template<typename Expr> |
|
typename result_of::left<Expr &>::type |
|
operator ()(Expr &e) const |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::left<Expr const &>::type |
|
operator ()(Expr const &e) const |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
}; |
|
|
|
/// \brief A callable PolymorphicFunctionObject that is |
|
/// equivalent to the \c right() function. |
|
struct right |
|
{ |
|
BOOST_PROTO_CALLABLE() |
|
|
|
template<typename Sig> |
|
struct result; |
|
|
|
template<typename This, typename Expr> |
|
struct result<This(Expr)> |
|
{ |
|
typedef typename result_of::right<Expr>::type type; |
|
}; |
|
|
|
/// \brief Return the right child of the given binary expression. |
|
/// \param expr The expression node. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true |
|
/// \pre <tt>2 == Expr::proto_arity::value</tt> |
|
/// \return <tt>proto::right(expr)</tt> |
|
/// \throw nothrow |
|
template<typename Expr> |
|
typename result_of::right<Expr &>::type |
|
operator ()(Expr &e) const |
|
{ |
|
return e.proto_base().child1; |
|
} |
|
|
|
template<typename Expr> |
|
typename result_of::right<Expr const &>::type |
|
operator ()(Expr const &e) const |
|
{ |
|
return e.proto_base().child1; |
|
} |
|
}; |
|
|
|
} |
|
|
|
/// \brief A function that wraps non-Proto expression types in Proto |
|
/// terminals and leaves Proto expression types alone. |
|
/// |
|
/// The <tt>as_expr()</tt> function turns objects into Proto terminals if |
|
/// they are not Proto expression types already. Non-Proto types are |
|
/// held by value, if possible. Types which are already Proto types are |
|
/// left alone and returned by reference. |
|
/// |
|
/// This function can be called either with an explicitly specified |
|
/// \c Domain parameter (i.e., <tt>as_expr\<Domain\>(t)</tt>), or |
|
/// without (i.e., <tt>as_expr(t)</tt>). If no domain is |
|
/// specified, \c default_domain is assumed. |
|
/// |
|
/// If <tt>is_expr\<T\>::value</tt> is \c true, then the argument is |
|
/// returned unmodified, by reference. Otherwise, the argument is wrapped |
|
/// in a Proto terminal expression node according to the following rules. |
|
/// If \c T is a function type, let \c A be <tt>T &</tt>. Otherwise, let |
|
/// \c A be the type \c T stripped of cv-qualifiers. Then, \c as_expr() |
|
/// returns <tt>Domain()(terminal\<A\>::type::make(t))</tt>. |
|
/// |
|
/// \param t The object to wrap. |
|
template<typename T> |
|
typename add_const<typename result_of::as_expr<T, default_domain>::type>::type |
|
as_expr(T &t BOOST_PROTO_DISABLE_IF_IS_CONST(T) BOOST_PROTO_DISABLE_IF_IS_FUNCTION(T)) |
|
{ |
|
return default_domain::as_expr<T>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename T> |
|
typename add_const<typename result_of::as_expr<T const, default_domain>::type>::type |
|
as_expr(T const &t) |
|
{ |
|
return default_domain::as_expr<T const>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Domain, typename T> |
|
typename add_const<typename result_of::as_expr<T, Domain>::type>::type |
|
as_expr(T &t BOOST_PROTO_DISABLE_IF_IS_CONST(T) BOOST_PROTO_DISABLE_IF_IS_FUNCTION(T)) |
|
{ |
|
return typename Domain::template as_expr<T>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Domain, typename T> |
|
typename add_const<typename result_of::as_expr<T const, Domain>::type>::type |
|
as_expr(T const &t) |
|
{ |
|
return typename Domain::template as_expr<T const>()(t); |
|
} |
|
|
|
/// \brief A function that wraps non-Proto expression types in Proto |
|
/// terminals (by reference) and returns Proto expression types by |
|
/// reference |
|
/// |
|
/// The <tt>as_child()</tt> function turns objects into Proto terminals if |
|
/// they are not Proto expression types already. Non-Proto types are |
|
/// held by reference. Types which are already Proto types are simply |
|
/// returned as-is. |
|
/// |
|
/// This function can be called either with an explicitly specified |
|
/// \c Domain parameter (i.e., <tt>as_child\<Domain\>(t)</tt>), or |
|
/// without (i.e., <tt>as_child(t)</tt>). If no domain is |
|
/// specified, \c default_domain is assumed. |
|
/// |
|
/// If <tt>is_expr\<T\>::value</tt> is \c true, then the argument is |
|
/// returned as-is. Otherwise, \c as_child() returns |
|
/// <tt>Domain()(terminal\<T &\>::type::make(t))</tt>. |
|
/// |
|
/// \param t The object to wrap. |
|
template<typename T> |
|
typename add_const<typename result_of::as_child<T, default_domain>::type>::type |
|
as_child(T &t BOOST_PROTO_DISABLE_IF_IS_CONST(T) BOOST_PROTO_DISABLE_IF_IS_FUNCTION(T)) |
|
{ |
|
return default_domain::as_child<T>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename T> |
|
typename add_const<typename result_of::as_child<T const, default_domain>::type>::type |
|
as_child(T const &t) |
|
{ |
|
return default_domain::as_child<T const>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Domain, typename T> |
|
typename add_const<typename result_of::as_child<T, Domain>::type>::type |
|
as_child(T &t BOOST_PROTO_DISABLE_IF_IS_CONST(T) BOOST_PROTO_DISABLE_IF_IS_FUNCTION(T)) |
|
{ |
|
return typename Domain::template as_child<T>()(t); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Domain, typename T> |
|
typename add_const<typename result_of::as_child<T const, Domain>::type>::type |
|
as_child(T const &t) |
|
{ |
|
return typename Domain::template as_child<T const>()(t); |
|
} |
|
|
|
/// \brief Return the Nth child of the specified Proto expression. |
|
/// |
|
/// Return the Nth child of the specified Proto expression. If |
|
/// \c N is not specified, as in \c child(expr), then \c N is assumed |
|
/// to be <tt>mpl::long_\<0\></tt>. The child is returned by |
|
/// reference. |
|
/// |
|
/// \param expr The Proto expression. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true. |
|
/// \pre \c N is an MPL Integral Constant. |
|
/// \pre <tt>N::value \< Expr::proto_arity::value</tt> |
|
/// \throw nothrow |
|
/// \return A reference to the Nth child |
|
template<typename N, typename Expr> |
|
typename result_of::child<Expr &, N>::type |
|
child(Expr &e BOOST_PROTO_DISABLE_IF_IS_CONST(Expr)) |
|
{ |
|
return result_of::child<Expr &, N>::call(e); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename N, typename Expr> |
|
typename result_of::child<Expr const &, N>::type |
|
child(Expr const &e) |
|
{ |
|
return result_of::child<Expr const &, N>::call(e); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr2> |
|
typename detail::expr_traits<typename Expr2::proto_base_expr::proto_child0>::reference |
|
child(Expr2 &expr2 BOOST_PROTO_DISABLE_IF_IS_CONST(Expr2)) |
|
{ |
|
return expr2.proto_base().child0; |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr2> |
|
typename detail::expr_traits<typename Expr2::proto_base_expr::proto_child0>::const_reference |
|
child(Expr2 const &expr2) |
|
{ |
|
return expr2.proto_base().child0; |
|
} |
|
|
|
/// \brief Return the Nth child of the specified Proto expression. |
|
/// |
|
/// Return the Nth child of the specified Proto expression. The child |
|
/// is returned by reference. |
|
/// |
|
/// \param expr The Proto expression. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true. |
|
/// \pre <tt>N \< Expr::proto_arity::value</tt> |
|
/// \throw nothrow |
|
/// \return A reference to the Nth child |
|
template<long N, typename Expr> |
|
typename result_of::child_c<Expr &, N>::type |
|
child_c(Expr &e BOOST_PROTO_DISABLE_IF_IS_CONST(Expr)) |
|
{ |
|
return result_of::child_c<Expr &, N>::call(e); |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<long N, typename Expr> |
|
typename result_of::child_c<Expr const &, N>::type |
|
child_c(Expr const &e) |
|
{ |
|
return result_of::child_c<Expr const &, N>::call(e); |
|
} |
|
|
|
/// \brief Return the value stored within the specified Proto |
|
/// terminal expression. |
|
/// |
|
/// Return the the value stored within the specified Proto |
|
/// terminal expression. The value is returned by |
|
/// reference. |
|
/// |
|
/// \param expr The Proto terminal expression. |
|
/// \pre <tt>N::value == 0</tt> |
|
/// \throw nothrow |
|
/// \return A reference to the terminal's value |
|
template<typename Expr> |
|
typename result_of::value<Expr &>::type |
|
value(Expr &e BOOST_PROTO_DISABLE_IF_IS_CONST(Expr)) |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::value<Expr const &>::type |
|
value(Expr const &e) |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
|
|
/// \brief Return the left child of the specified binary Proto |
|
/// expression. |
|
/// |
|
/// Return the left child of the specified binary Proto expression. The |
|
/// child is returned by reference. |
|
/// |
|
/// \param expr The Proto expression. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true. |
|
/// \pre <tt>2 == Expr::proto_arity::value</tt> |
|
/// \throw nothrow |
|
/// \return A reference to the left child |
|
template<typename Expr> |
|
typename result_of::left<Expr &>::type |
|
left(Expr &e BOOST_PROTO_DISABLE_IF_IS_CONST(Expr)) |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::left<Expr const &>::type |
|
left(Expr const &e) |
|
{ |
|
return e.proto_base().child0; |
|
} |
|
|
|
/// \brief Return the right child of the specified binary Proto |
|
/// expression. |
|
/// |
|
/// Return the right child of the specified binary Proto expression. The |
|
/// child is returned by reference. |
|
/// |
|
/// \param expr The Proto expression. |
|
/// \pre <tt>is_expr\<Expr\>::value</tt> is \c true. |
|
/// \pre <tt>2 == Expr::proto_arity::value</tt> |
|
/// \throw nothrow |
|
/// \return A reference to the right child |
|
template<typename Expr> |
|
typename result_of::right<Expr &>::type |
|
right(Expr &e BOOST_PROTO_DISABLE_IF_IS_CONST(Expr)) |
|
{ |
|
return e.proto_base().child1; |
|
} |
|
|
|
/// \overload |
|
/// |
|
template<typename Expr> |
|
typename result_of::right<Expr const &>::type |
|
right(Expr const &e) |
|
{ |
|
return e.proto_base().child1; |
|
} |
|
|
|
/// INTERNAL ONLY |
|
/// |
|
template<typename Domain> |
|
struct is_callable<functional::as_expr<Domain> > |
|
: mpl::true_ |
|
{}; |
|
|
|
/// INTERNAL ONLY |
|
/// |
|
template<typename Domain> |
|
struct is_callable<functional::as_child<Domain> > |
|
: mpl::true_ |
|
{}; |
|
|
|
/// INTERNAL ONLY |
|
/// |
|
template<long N> |
|
struct is_callable<functional::child_c<N> > |
|
: mpl::true_ |
|
{}; |
|
|
|
/// INTERNAL ONLY |
|
/// |
|
template<typename N> |
|
struct is_callable<functional::child<N> > |
|
: mpl::true_ |
|
{}; |
|
|
|
}} |
|
|
|
#if BOOST_WORKAROUND( BOOST_MSVC, >= 1400 ) |
|
#pragma warning(pop) |
|
#endif |
|
|
|
#endif
|
|
|