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179 lines
6.9 KiB
179 lines
6.9 KiB
#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 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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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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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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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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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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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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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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