186 lines
7.3 KiB
C++
186 lines
7.3 KiB
C++
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#if !defined(BOOST_PROTO_DONT_USE_PREPROCESSED_FILES)
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#include <boost/proto/detail/preprocessed/basic_expr.hpp>
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#elif !defined(BOOST_PP_IS_ITERATING)
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_CHILD(Z, N, DATA) \
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typedef BOOST_PP_CAT(Arg, N) BOOST_PP_CAT(proto_child, N); \
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BOOST_PP_CAT(proto_child, N) BOOST_PP_CAT(child, N); \
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/**< INTERNAL ONLY */
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/// INTERNAL ONLY
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///
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#define BOOST_PROTO_VOID(Z, N, DATA) \
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typedef void BOOST_PP_CAT(proto_child, N); \
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/**< INTERNAL ONLY */
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#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
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#pragma wave option(preserve: 2, line: 0, output: "preprocessed/basic_expr.hpp")
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#endif
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///////////////////////////////////////////////////////////////////////////////
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/// \file basic_expr.hpp
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/// Contains definition of basic_expr\<\> class template.
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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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#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
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#pragma wave option(preserve: 1)
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#endif
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// The expr<> specializations are actually defined here.
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#define BOOST_PROTO_DEFINE_TERMINAL
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#define BOOST_PP_ITERATION_PARAMS_1 (3, (0, 0, <boost/proto/detail/basic_expr.hpp>))
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#include BOOST_PP_ITERATE()
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#undef BOOST_PROTO_DEFINE_TERMINAL
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#define BOOST_PP_ITERATION_PARAMS_1 (3, (1, BOOST_PROTO_MAX_ARITY, <boost/proto/detail/basic_expr.hpp>))
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#include BOOST_PP_ITERATE()
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#if defined(__WAVE__) && defined(BOOST_PROTO_CREATE_PREPROCESSED_FILES)
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#pragma wave option(output: null)
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#endif
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#undef BOOST_PROTO_CHILD
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#undef BOOST_PROTO_VOID
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#else
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#define ARG_COUNT BOOST_PP_MAX(1, BOOST_PP_ITERATION())
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/// \brief Simplified representation of a node in an expression tree.
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///
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/// \c proto::basic_expr\<\> is a node in an expression template tree. It
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/// is a container for its child sub-trees. It also serves as
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/// the terminal nodes of the tree.
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///
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/// \c Tag is type that represents the operation encoded by
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/// this expression. It is typically one of the structs
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/// in the \c boost::proto::tag namespace, but it doesn't
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/// have to be.
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///
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/// \c Args is a type list representing the type of the children
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/// of this expression. It is an instantiation of one
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/// of \c proto::list1\<\>, \c proto::list2\<\>, etc. The
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/// child types must all themselves be either \c expr\<\>
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/// or <tt>proto::expr\<\>&</tt>. If \c Args is an
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/// instantiation of \c proto::term\<\> then this
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/// \c expr\<\> type represents a terminal expression;
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/// the parameter to the \c proto::term\<\> template
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/// represents the terminal's value type.
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///
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/// \c Arity is an integral constant representing the number of child
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/// nodes this node contains. If \c Arity is 0, then this
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/// node is a terminal.
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///
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/// \c proto::basic_expr\<\> is a valid Fusion random-access sequence, where
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/// the elements of the sequence are the child expressions.
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#ifdef BOOST_PROTO_DEFINE_TERMINAL
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template<typename Tag, typename Arg0>
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struct basic_expr<Tag, term<Arg0>, 0>
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#else
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template<typename Tag BOOST_PP_ENUM_TRAILING_PARAMS(ARG_COUNT, typename Arg)>
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struct basic_expr<Tag, BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)>, BOOST_PP_ITERATION() >
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#endif
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{
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typedef Tag proto_tag;
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static const long proto_arity_c = BOOST_PP_ITERATION();
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typedef mpl::long_<BOOST_PP_ITERATION() > proto_arity;
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typedef basic_expr proto_base_expr;
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#ifdef BOOST_PROTO_DEFINE_TERMINAL
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typedef term<Arg0> proto_args;
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#else
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typedef BOOST_PP_CAT(list, BOOST_PP_ITERATION())<BOOST_PP_ENUM_PARAMS(ARG_COUNT, Arg)> proto_args;
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#endif
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typedef basic_expr proto_grammar;
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typedef basic_default_domain proto_domain;
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typedef default_generator proto_generator;
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typedef proto::tag::proto_expr<Tag, proto_domain> fusion_tag;
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typedef basic_expr proto_derived_expr;
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typedef void proto_is_expr_; /**< INTERNAL ONLY */
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BOOST_PP_REPEAT(ARG_COUNT, BOOST_PROTO_CHILD, ~)
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BOOST_PP_REPEAT_FROM_TO(ARG_COUNT, BOOST_PROTO_MAX_ARITY, BOOST_PROTO_VOID, ~)
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/// \return *this
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///
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BOOST_FORCEINLINE
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basic_expr const &proto_base() const
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{
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return *this;
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}
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/// \overload
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///
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BOOST_FORCEINLINE
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basic_expr &proto_base()
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{
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return *this;
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}
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#ifdef BOOST_PROTO_DEFINE_TERMINAL
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/// \return A new \c expr\<\> object initialized with the specified
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/// arguments.
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///
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template<typename A0>
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BOOST_FORCEINLINE
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static basic_expr const make(A0 &a0)
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{
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return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0));
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}
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/// \overload
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///
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template<typename A0>
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BOOST_FORCEINLINE
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static basic_expr const make(A0 const &a0)
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{
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return detail::make_terminal(a0, static_cast<basic_expr *>(0), static_cast<proto_args *>(0));
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}
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#else
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/// \return A new \c expr\<\> object initialized with the specified
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/// arguments.
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///
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template<BOOST_PP_ENUM_PARAMS(ARG_COUNT, typename A)>
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BOOST_FORCEINLINE
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static basic_expr const make(BOOST_PP_ENUM_BINARY_PARAMS(ARG_COUNT, A, const &a))
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{
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basic_expr that = {BOOST_PP_ENUM_PARAMS(ARG_COUNT, a)};
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return that;
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}
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#endif
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#if 1 == BOOST_PP_ITERATION()
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/// If \c Tag is \c boost::proto::tag::address_of and \c proto_child0 is
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/// <tt>T&</tt>, then \c address_of_hack_type_ is <tt>T*</tt>.
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/// Otherwise, it is some undefined type.
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typedef typename detail::address_of_hack<Tag, proto_child0>::type address_of_hack_type_;
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/// \return The address of <tt>this->child0</tt> if \c Tag is
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/// \c boost::proto::tag::address_of. Otherwise, this function will
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/// fail to compile.
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///
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/// \attention Proto overloads <tt>operator&</tt>, which means that
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/// proto-ified objects cannot have their addresses taken, unless we use
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/// the following hack to make \c &x implicitly convertible to \c X*.
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BOOST_FORCEINLINE
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operator address_of_hack_type_() const
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{
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return boost::addressof(this->child0);
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}
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#else
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/// INTERNAL ONLY
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///
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typedef detail::not_a_valid_type address_of_hack_type_;
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#endif
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};
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#undef ARG_COUNT
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#endif
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