| /////////////////////////////////////////////////////////////////////////////// |
| /// \file make_expr.hpp |
| /// Definition of the \c make_expr() and \c unpack_expr() utilities for |
| /// building Proto expression nodes from child nodes or from a Fusion |
| /// sequence of child nodes, respectively. |
| // |
| // Copyright 2008 Eric Niebler. Distributed under the Boost |
| // Software License, Version 1.0. (See accompanying file |
| // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
| |
| #ifndef BOOST_PROTO_MAKE_EXPR_HPP_EAN_04_01_2005 |
| #define BOOST_PROTO_MAKE_EXPR_HPP_EAN_04_01_2005 |
| |
| #include <boost/preprocessor/cat.hpp> |
| #include <boost/preprocessor/arithmetic/inc.hpp> |
| #include <boost/preprocessor/arithmetic/dec.hpp> |
| #include <boost/preprocessor/arithmetic/sub.hpp> |
| #include <boost/preprocessor/punctuation/comma_if.hpp> |
| #include <boost/preprocessor/iteration/iterate.hpp> |
| #include <boost/preprocessor/facilities/intercept.hpp> |
| #include <boost/preprocessor/repetition/enum.hpp> |
| #include <boost/preprocessor/repetition/enum_params.hpp> |
| #include <boost/preprocessor/repetition/enum_binary_params.hpp> |
| #include <boost/preprocessor/repetition/enum_shifted_params.hpp> |
| #include <boost/preprocessor/repetition/enum_trailing_params.hpp> |
| #include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp> |
| #include <boost/preprocessor/repetition/repeat.hpp> |
| #include <boost/ref.hpp> |
| #include <boost/mpl/if.hpp> |
| #include <boost/mpl/assert.hpp> |
| #include <boost/mpl/eval_if.hpp> |
| #include <boost/utility/enable_if.hpp> |
| #include <boost/type_traits/add_const.hpp> |
| #include <boost/type_traits/add_reference.hpp> |
| #include <boost/type_traits/remove_cv.hpp> |
| #include <boost/proto/proto_fwd.hpp> |
| #include <boost/proto/traits.hpp> |
| #include <boost/proto/domain.hpp> |
| #include <boost/proto/generate.hpp> |
| #include <boost/fusion/include/at_c.hpp> |
| #include <boost/fusion/include/begin.hpp> |
| #include <boost/fusion/include/next.hpp> |
| #include <boost/fusion/include/value_of.hpp> |
| #include <boost/fusion/include/size.hpp> |
| #include <boost/proto/detail/poly_function.hpp> |
| #include <boost/proto/detail/deprecated.hpp> |
| |
| #if defined(_MSC_VER) |
| # pragma warning(push) |
| # pragma warning(disable : 4180) // qualifier applied to function type has no meaning; ignored |
| # pragma warning(disable : 4714) // function 'xxx' marked as __forceinline not inlined |
| #endif |
| |
| namespace boost { namespace proto |
| { |
| /// INTERNAL ONLY |
| /// |
| #define BOOST_PROTO_AS_CHILD_TYPE(Z, N, DATA) \ |
| typename boost::proto::detail::protoify< \ |
| BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 0, DATA), N) \ |
| , BOOST_PP_TUPLE_ELEM(3, 2, DATA) \ |
| >::result_type \ |
| /**/ |
| |
| /// INTERNAL ONLY |
| /// |
| #define BOOST_PROTO_AS_CHILD(Z, N, DATA) \ |
| boost::proto::detail::protoify< \ |
| BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 0, DATA), N) \ |
| , BOOST_PP_TUPLE_ELEM(3, 2, DATA) \ |
| >()(BOOST_PP_CAT(BOOST_PP_TUPLE_ELEM(3, 1, DATA), N)) \ |
| /**/ |
| |
| namespace detail |
| { |
| template<typename T, typename Domain> |
| struct protoify |
| : Domain::template as_expr<T> |
| {}; |
| |
| template<typename T, typename Domain> |
| struct protoify<T &, Domain> |
| : Domain::template as_child<T> |
| {}; |
| |
| template<typename T, typename Domain> |
| struct protoify<boost::reference_wrapper<T>, Domain> |
| : Domain::template as_child<T> |
| {}; |
| |
| template<typename T, typename Domain> |
| struct protoify<boost::reference_wrapper<T> const, Domain> |
| : Domain::template as_child<T> |
| {}; |
| |
| // Definition of detail::unpack_expr_ |
| #include <boost/proto/detail/unpack_expr_.hpp> |
| |
| // Definition of detail::make_expr_ |
| #include <boost/proto/detail/make_expr_.hpp> |
| } |
| |
| namespace result_of |
| { |
| /// \brief Metafunction that computes the return type of the |
| /// \c make_expr() function, with a domain deduced from the |
| /// domains of the children. |
| /// |
| /// Use the <tt>result_of::make_expr\<\></tt> metafunction to |
| /// compute the return type of the \c make_expr() function. |
| /// |
| /// In this specialization, the domain is deduced from the |
| /// domains of the child types. (If |
| /// <tt>is_domain\<A0\>::value</tt> is \c true, then another |
| /// specialization is selected.) |
| template< |
| typename Tag |
| , BOOST_PP_ENUM_PARAMS(BOOST_PROTO_MAX_ARITY, typename A) |
| , typename Void1 // = void |
| , typename Void2 // = void |
| > |
| struct make_expr |
| { |
| /// Same as <tt>result_of::make_expr\<Tag, D, A0, ... AN\>::type</tt> |
| /// where \c D is the deduced domain, which is calculated as follows: |
| /// |
| /// For each \c x in <tt>[0,N)</tt> (proceeding in order beginning with |
| /// <tt>x=0</tt>), if <tt>domain_of\<Ax\>::type</tt> is not |
| /// \c default_domain, then \c D is <tt>domain_of\<Ax\>::type</tt>. |
| /// Otherwise, \c D is \c default_domain. |
| typedef |
| typename detail::make_expr_< |
| Tag |
| , deduce_domain |
| BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A) |
| >::result_type |
| type; |
| }; |
| |
| /// \brief Metafunction that computes the return type of the |
| /// \c make_expr() function, within the specified domain. |
| /// |
| /// Use the <tt>result_of::make_expr\<\></tt> metafunction to compute |
| /// the return type of the \c make_expr() function. |
| template< |
| typename Tag |
| , typename Domain |
| BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, typename A) |
| > |
| struct make_expr< |
| Tag |
| , Domain |
| BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A) |
| , typename Domain::proto_is_domain_ |
| > |
| { |
| /// If \c Tag is <tt>tag::terminal</tt>, then \c type is a |
| /// typedef for <tt>boost::result_of\<Domain(expr\<tag::terminal, |
| /// term\<A0\> \>)\>::type</tt>. |
| /// |
| /// Otherwise, \c type is a typedef for <tt>boost::result_of\<Domain(expr\<Tag, |
| /// listN\< as_child\<A0\>::type, ... as_child\<AN\>::type\>) |
| /// \>::type</tt>, where \c N is the number of non-void template |
| /// arguments, and <tt>as_child\<A\>::type</tt> is evaluated as |
| /// follows: |
| /// |
| /// \li If <tt>is_expr\<A\>::value</tt> is \c true, then the |
| /// child type is \c A. |
| /// \li If \c A is <tt>B &</tt> or <tt>cv boost::reference_wrapper\<B\></tt>, |
| /// and <tt>is_expr\<B\>::value</tt> is \c true, then the |
| /// child type is <tt>B &</tt>. |
| /// \li If <tt>is_expr\<A\>::value</tt> is \c false, then the |
| /// child type is <tt>boost::result_of\<Domain(expr\<tag::terminal, term\<A\> \> |
| /// )\>::type</tt>. |
| /// \li If \c A is <tt>B &</tt> or <tt>cv boost::reference_wrapper\<B\></tt>, |
| /// and <tt>is_expr\<B\>::value</tt> is \c false, then the |
| /// child type is <tt>boost::result_of\<Domain(expr\<tag::terminal, term\<B &\> \> |
| /// )\>::type</tt>. |
| typedef |
| typename detail::make_expr_< |
| Tag |
| , Domain |
| BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A) |
| >::result_type |
| type; |
| }; |
| |
| /// \brief Metafunction that computes the return type of the |
| /// \c unpack_expr() function, with a domain deduced from the |
| /// domains of the children. |
| /// |
| /// Use the <tt>result_of::unpack_expr\<\></tt> metafunction to |
| /// compute the return type of the \c unpack_expr() function. |
| /// |
| /// \c Sequence is a Fusion Forward Sequence. |
| /// |
| /// In this specialization, the domain is deduced from the |
| /// domains of the child types. (If |
| /// <tt>is_domain\<Sequence>::value</tt> is \c true, then another |
| /// specialization is selected.) |
| template< |
| typename Tag |
| , typename Sequence |
| , typename Void1 // = void |
| , typename Void2 // = void |
| > |
| struct unpack_expr |
| { |
| /// Let \c S be the type of a Fusion Random Access Sequence |
| /// equivalent to \c Sequence. Then \c type is the |
| /// same as <tt>result_of::make_expr\<Tag, |
| /// fusion::result_of::value_at_c\<S, 0\>::type, ... |
| /// fusion::result_of::value_at_c\<S, N-1\>::type\>::type</tt>, |
| /// where \c N is the size of \c S. |
| typedef |
| typename detail::unpack_expr_< |
| Tag |
| , deduce_domain |
| , Sequence |
| , fusion::result_of::size<Sequence>::type::value |
| >::type |
| type; |
| }; |
| |
| /// \brief Metafunction that computes the return type of the |
| /// \c unpack_expr() function, within the specified domain. |
| /// |
| /// Use the <tt>result_of::make_expr\<\></tt> metafunction to compute |
| /// the return type of the \c make_expr() function. |
| template<typename Tag, typename Domain, typename Sequence> |
| struct unpack_expr<Tag, Domain, Sequence, typename Domain::proto_is_domain_> |
| { |
| /// Let \c S be the type of a Fusion Random Access Sequence |
| /// equivalent to \c Sequence. Then \c type is the |
| /// same as <tt>result_of::make_expr\<Tag, Domain, |
| /// fusion::result_of::value_at_c\<S, 0\>::type, ... |
| /// fusion::result_of::value_at_c\<S, N-1\>::type\>::type</tt>, |
| /// where \c N is the size of \c S. |
| typedef |
| typename detail::unpack_expr_< |
| Tag |
| , Domain |
| , Sequence |
| , fusion::result_of::size<Sequence>::type::value |
| >::type |
| type; |
| }; |
| } |
| |
| namespace functional |
| { |
| /// \brief A callable function object equivalent to the |
| /// \c proto::make_expr() function. |
| /// |
| /// In all cases, <tt>functional::make_expr\<Tag, Domain\>()(a0, ... aN)</tt> |
| /// is equivalent to <tt>proto::make_expr\<Tag, Domain\>(a0, ... aN)</tt>. |
| /// |
| /// <tt>functional::make_expr\<Tag\>()(a0, ... aN)</tt> |
| /// is equivalent to <tt>proto::make_expr\<Tag\>(a0, ... aN)</tt>. |
| template<typename Tag, typename Domain /* = deduce_domain*/> |
| struct make_expr |
| { |
| BOOST_PROTO_CALLABLE() |
| BOOST_PROTO_POLY_FUNCTION() |
| |
| template<typename Sig> |
| struct result; |
| |
| template<typename This, typename A0> |
| struct result<This(A0)> |
| { |
| typedef |
| typename result_of::make_expr< |
| Tag |
| , Domain |
| , A0 |
| >::type |
| type; |
| }; |
| |
| /// Construct an expression node with tag type \c Tag |
| /// and in the domain \c Domain. |
| /// |
| /// \return <tt>proto::make_expr\<Tag, Domain\>(a0,...aN)</tt> |
| template<typename A0> |
| BOOST_FORCEINLINE |
| typename result_of::make_expr< |
| Tag |
| , Domain |
| , A0 const |
| >::type const |
| operator ()(A0 const &a0) const |
| { |
| return proto::detail::make_expr_< |
| Tag |
| , Domain |
| , A0 const |
| >()(a0); |
| } |
| |
| // Additional overloads generated by the preprocessor ... |
| #include <boost/proto/detail/make_expr_funop.hpp> |
| |
| /// INTERNAL ONLY |
| /// |
| template< |
| BOOST_PP_ENUM_BINARY_PARAMS( |
| BOOST_PROTO_MAX_ARITY |
| , typename A |
| , = void BOOST_PP_INTERCEPT |
| ) |
| > |
| struct impl |
| : detail::make_expr_< |
| Tag |
| , Domain |
| BOOST_PP_ENUM_TRAILING_PARAMS(BOOST_PROTO_MAX_ARITY, A) |
| > |
| {}; |
| }; |
| |
| /// \brief A callable function object equivalent to the |
| /// \c proto::unpack_expr() function. |
| /// |
| /// In all cases, <tt>functional::unpack_expr\<Tag, Domain\>()(seq)</tt> |
| /// is equivalent to <tt>proto::unpack_expr\<Tag, Domain\>(seq)</tt>. |
| /// |
| /// <tt>functional::unpack_expr\<Tag\>()(seq)</tt> |
| /// is equivalent to <tt>proto::unpack_expr\<Tag\>(seq)</tt>. |
| template<typename Tag, typename Domain /* = deduce_domain*/> |
| struct unpack_expr |
| { |
| BOOST_PROTO_CALLABLE() |
| |
| template<typename Sig> |
| struct result; |
| |
| template<typename This, typename Sequence> |
| struct result<This(Sequence)> |
| { |
| typedef |
| typename result_of::unpack_expr< |
| Tag |
| , Domain |
| , typename remove_reference<Sequence>::type |
| >::type |
| type; |
| }; |
| |
| /// Construct an expression node with tag type \c Tag |
| /// and in the domain \c Domain. |
| /// |
| /// \param sequence A Fusion Forward Sequence |
| /// \return <tt>proto::unpack_expr\<Tag, Domain\>(sequence)</tt> |
| template<typename Sequence> |
| BOOST_FORCEINLINE |
| typename result_of::unpack_expr<Tag, Domain, Sequence const>::type const |
| operator ()(Sequence const &sequence) const |
| { |
| return proto::detail::unpack_expr_< |
| Tag |
| , Domain |
| , Sequence const |
| , fusion::result_of::size<Sequence>::type::value |
| >::call(sequence); |
| } |
| }; |
| |
| } // namespace functional |
| |
| /// \brief Construct an expression of the requested tag type |
| /// with a domain and with the specified arguments as children. |
| /// |
| /// This function template may be invoked either with or without |
| /// specifying a \c Domain argument. If no domain is specified, |
| /// the domain is deduced by examining in order the domains of |
| /// the given arguments and taking the first that is not |
| /// \c default_domain, if any such domain exists, or |
| /// \c default_domain otherwise. |
| /// |
| /// Let \c wrap_(x) be defined such that: |
| /// \li If \c x is a <tt>boost::reference_wrapper\<\></tt>, |
| /// \c wrap_(x) is equivalent to <tt>as_child\<Domain\>(x.get())</tt>. |
| /// \li Otherwise, \c wrap_(x) is equivalent to |
| /// <tt>as_expr\<Domain\>(x)</tt>. |
| /// |
| /// Let <tt>make_\<Tag\>(b0,...bN)</tt> be defined as |
| /// <tt>expr\<Tag, listN\<C0,...CN\> \>::make(c0,...cN)</tt> |
| /// where \c Bx is the type of \c bx. |
| /// |
| /// \return <tt>Domain()(make_\<Tag\>(wrap_(a0),...wrap_(aN)))</tt>. |
| template<typename Tag, typename A0> |
| BOOST_FORCEINLINE |
| typename lazy_disable_if< |
| is_domain<A0> |
| , result_of::make_expr< |
| Tag |
| , A0 const |
| > |
| >::type const |
| make_expr(A0 const &a0) |
| { |
| return proto::detail::make_expr_< |
| Tag |
| , deduce_domain |
| , A0 const |
| >()(a0); |
| } |
| |
| /// \overload |
| /// |
| template<typename Tag, typename Domain, typename C0> |
| BOOST_FORCEINLINE |
| typename result_of::make_expr< |
| Tag |
| , Domain |
| , C0 const |
| >::type const |
| make_expr(C0 const &c0) |
| { |
| return proto::detail::make_expr_< |
| Tag |
| , Domain |
| , C0 const |
| >()(c0); |
| } |
| |
| // Additional overloads generated by the preprocessor... |
| #include <boost/proto/detail/make_expr.hpp> |
| |
| /// \brief Construct an expression of the requested tag type |
| /// with a domain and with childres from the specified Fusion |
| /// Forward Sequence. |
| /// |
| /// This function template may be invoked either with or without |
| /// specifying a \c Domain argument. If no domain is specified, |
| /// the domain is deduced by examining in order the domains of the |
| /// elements of \c sequence and taking the first that is not |
| /// \c default_domain, if any such domain exists, or |
| /// \c default_domain otherwise. |
| /// |
| /// Let \c s be a Fusion Random Access Sequence equivalent to \c sequence. |
| /// Let <tt>wrap_\<N\>(s)</tt>, where \c s has type \c S, be defined |
| /// such that: |
| /// \li If <tt>fusion::result_of::value_at_c\<S,N\>::type</tt> is a reference, |
| /// <tt>wrap_\<N\>(s)</tt> is equivalent to |
| /// <tt>as_child\<Domain\>(fusion::at_c\<N\>(s))</tt>. |
| /// \li Otherwise, <tt>wrap_\<N\>(s)</tt> is equivalent to |
| /// <tt>as_expr\<Domain\>(fusion::at_c\<N\>(s))</tt>. |
| /// |
| /// Let <tt>make_\<Tag\>(b0,...bN)</tt> be defined as |
| /// <tt>expr\<Tag, listN\<B0,...BN\> \>::make(b0,...bN)</tt> |
| /// where \c Bx is the type of \c bx. |
| /// |
| /// \param sequence a Fusion Forward Sequence. |
| /// \return <tt>Domain()(make_\<Tag\>(wrap_\<0\>(s),...wrap_\<N-1\>(s)))</tt>, |
| /// where N is the size of \c Sequence. |
| template<typename Tag, typename Sequence> |
| BOOST_FORCEINLINE |
| typename lazy_disable_if< |
| is_domain<Sequence> |
| , result_of::unpack_expr<Tag, Sequence const> |
| >::type const |
| unpack_expr(Sequence const &sequence) |
| { |
| return proto::detail::unpack_expr_< |
| Tag |
| , deduce_domain |
| , Sequence const |
| , fusion::result_of::size<Sequence>::type::value |
| >::call(sequence); |
| } |
| |
| /// \overload |
| /// |
| template<typename Tag, typename Domain, typename Sequence2> |
| BOOST_FORCEINLINE |
| typename result_of::unpack_expr<Tag, Domain, Sequence2 const>::type const |
| unpack_expr(Sequence2 const &sequence2) |
| { |
| return proto::detail::unpack_expr_< |
| Tag |
| , Domain |
| , Sequence2 const |
| , fusion::result_of::size<Sequence2>::type::value |
| >::call(sequence2); |
| } |
| |
| /// INTERNAL ONLY |
| /// |
| template<typename Tag, typename Domain> |
| struct is_callable<functional::make_expr<Tag, Domain> > |
| : mpl::true_ |
| {}; |
| |
| /// INTERNAL ONLY |
| /// |
| template<typename Tag, typename Domain> |
| struct is_callable<functional::unpack_expr<Tag, Domain> > |
| : mpl::true_ |
| {}; |
| |
| }} |
| |
| #if defined(_MSC_VER) |
| # pragma warning(pop) |
| #endif |
| |
| #endif // BOOST_PROTO_MAKE_EXPR_HPP_EAN_04_01_2005 |
