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/Src/Dependencies/Boost/boost/proto/context/default.hpp

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  1///////////////////////////////////////////////////////////////////////////////
  2/// \file default.hpp
  3/// Definintion of default_context, a default evaluation context for
  4/// proto::eval() that uses Boost.Typeof to deduce return types
  5/// of the built-in operators.
  6//
  7//  Copyright 2008 Eric Niebler. Distributed under the Boost
  8//  Software License, Version 1.0. (See accompanying file
  9//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 10
 11#ifndef BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
 12#define BOOST_PROTO_CONTEXT_DEFAULT_HPP_EAN_01_08_2007
 13
 14#include <boost/config.hpp>
 15#include <boost/preprocessor/arithmetic/add.hpp>
 16#include <boost/preprocessor/arithmetic/sub.hpp>
 17#include <boost/preprocessor/iteration/iterate.hpp>
 18#include <boost/preprocessor/repetition/enum.hpp>
 19#include <boost/preprocessor/repetition/enum_shifted.hpp>
 20#include <boost/utility/result_of.hpp>
 21#include <boost/type_traits/is_const.hpp>
 22#include <boost/type_traits/is_function.hpp>
 23#include <boost/type_traits/remove_reference.hpp>
 24#include <boost/type_traits/is_member_pointer.hpp>
 25#include <boost/type_traits/is_member_object_pointer.hpp>
 26#include <boost/type_traits/is_member_function_pointer.hpp>
 27#include <boost/proto/proto_fwd.hpp>
 28#include <boost/proto/tags.hpp>
 29#include <boost/proto/eval.hpp>
 30#include <boost/proto/traits.hpp> // for proto::child_c()
 31#include <boost/proto/detail/decltype.hpp>
 32
 33namespace boost { namespace proto
 34{
 35/// INTERNAL ONLY
 36///
 37#define UNREF(x) typename boost::remove_reference<x>::type
 38
 39    namespace context
 40    {
 41        template<
 42            typename Expr
 43          , typename Context
 44          , typename Tag        // = typename Expr::proto_tag
 45          , long Arity          // = Expr::proto_arity_c
 46        >
 47        struct default_eval
 48        {};
 49
 50        template<typename Expr, typename Context>
 51        struct default_eval<Expr, Context, tag::terminal, 0>
 52        {
 53            typedef
 54                typename proto::result_of::value<Expr &>::type
 55            result_type;
 56
 57            result_type operator ()(Expr &expr, Context &) const
 58            {
 59                return proto::value(expr);
 60            }
 61        };
 62
 63        /// INTERNAL ONLY
 64        ///
 65    #define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE)                                       \
 66        template<typename Expr, typename Context>                                               \
 67        struct default_eval<Expr, Context, TAG, 1>                                              \
 68        {                                                                                       \
 69        private:                                                                                \
 70            typedef typename proto::result_of::child_c<Expr, 0>::type e0;                       \
 71            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;               \
 72        public:                                                                                 \
 73            BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type)                    \
 74            result_type operator ()(Expr &expr, Context &ctx) const                             \
 75            {                                                                                   \
 76                return OP proto::eval(proto::child_c<0>(expr), ctx);                            \
 77            }                                                                                   \
 78        };                                                                                      \
 79        /**/
 80
 81        /// INTERNAL ONLY
 82        ///
 83    #define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE)                              \
 84        template<typename Expr, typename Context>                                               \
 85        struct default_eval<Expr, Context, TAG, 2>                                              \
 86        {                                                                                       \
 87        private:                                                                                \
 88            typedef typename proto::result_of::child_c<Expr, 0>::type e0;                       \
 89            typedef typename proto::result_of::child_c<Expr, 1>::type e1;                       \
 90            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;               \
 91            typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;               \
 92        public:                                                                                 \
 93            BOOST_PROTO_DECLTYPE_(                                                              \
 94                proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>()                        \
 95              , result_type                                                                     \
 96            )                                                                                   \
 97            result_type operator ()(Expr &expr, Context &ctx) const                             \
 98            {                                                                                   \
 99                return proto::eval(                                                             \
100                    proto::child_c<0>(expr), ctx) OP proto::eval(proto::child_c<1>(expr)        \
101                  , ctx                                                                         \
102                );                                                                              \
103            }                                                                                   \
104        };                                                                                      \
105        /**/
106
107        BOOST_PROTO_UNARY_DEFAULT_EVAL(+, proto::tag::unary_plus, make)
108        BOOST_PROTO_UNARY_DEFAULT_EVAL(-, proto::tag::negate, make)
109        BOOST_PROTO_UNARY_DEFAULT_EVAL(*, proto::tag::dereference, make)
110        BOOST_PROTO_UNARY_DEFAULT_EVAL(~, proto::tag::complement, make)
111        BOOST_PROTO_UNARY_DEFAULT_EVAL(&, proto::tag::address_of, make)
112        BOOST_PROTO_UNARY_DEFAULT_EVAL(!, proto::tag::logical_not, make)
113        BOOST_PROTO_UNARY_DEFAULT_EVAL(++, proto::tag::pre_inc, make_mutable)
114        BOOST_PROTO_UNARY_DEFAULT_EVAL(--, proto::tag::pre_dec, make_mutable)
115
116        BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, proto::tag::shift_left, make_mutable, make)
117        BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, proto::tag::shift_right, make_mutable, make)
118        BOOST_PROTO_BINARY_DEFAULT_EVAL(*, proto::tag::multiplies, make, make)
119        BOOST_PROTO_BINARY_DEFAULT_EVAL(/, proto::tag::divides, make, make)
120        BOOST_PROTO_BINARY_DEFAULT_EVAL(%, proto::tag::modulus, make, make)
121        BOOST_PROTO_BINARY_DEFAULT_EVAL(+, proto::tag::plus, make, make)
122        BOOST_PROTO_BINARY_DEFAULT_EVAL(-, proto::tag::minus, make, make)
123        BOOST_PROTO_BINARY_DEFAULT_EVAL(<, proto::tag::less, make, make)
124        BOOST_PROTO_BINARY_DEFAULT_EVAL(>, proto::tag::greater, make, make)
125        BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, proto::tag::less_equal, make, make)
126        BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, proto::tag::greater_equal, make, make)
127        BOOST_PROTO_BINARY_DEFAULT_EVAL(==, proto::tag::equal_to, make, make)
128        BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, proto::tag::not_equal_to, make, make)
129        BOOST_PROTO_BINARY_DEFAULT_EVAL(||, proto::tag::logical_or, make, make)
130        BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, proto::tag::logical_and, make, make)
131        BOOST_PROTO_BINARY_DEFAULT_EVAL(&, proto::tag::bitwise_and, make, make)
132        BOOST_PROTO_BINARY_DEFAULT_EVAL(|, proto::tag::bitwise_or, make, make)
133        BOOST_PROTO_BINARY_DEFAULT_EVAL(^, proto::tag::bitwise_xor, make, make)
134
135        BOOST_PROTO_BINARY_DEFAULT_EVAL(=, proto::tag::assign, make_mutable, make)
136        BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, proto::tag::shift_left_assign, make_mutable, make)
137        BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, proto::tag::shift_right_assign, make_mutable, make)
138        BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, proto::tag::multiplies_assign, make_mutable, make)
139        BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, proto::tag::divides_assign, make_mutable, make)
140        BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, proto::tag::modulus_assign, make_mutable, make)
141        BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, proto::tag::plus_assign, make_mutable, make)
142        BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, proto::tag::minus_assign, make_mutable, make)
143        BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, proto::tag::bitwise_and_assign, make_mutable, make)
144        BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, proto::tag::bitwise_or_assign, make_mutable, make)
145        BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, proto::tag::bitwise_xor_assign, make_mutable, make)
146
147    #undef BOOST_PROTO_UNARY_DEFAULT_EVAL
148    #undef BOOST_PROTO_BINARY_DEFAULT_EVAL
149
150        /// INTERNAL ONLY
151        template<typename Expr, typename Context>
152        struct is_member_function_eval
153          : is_member_function_pointer<
154                typename detail::uncvref<
155                    typename proto::result_of::eval<
156                        typename remove_reference<
157                            typename proto::result_of::child_c<Expr, 1>::type
158                        >::type
159                      , Context
160                    >::type
161                >::type
162            >
163        {};
164
165        /// INTERNAL ONLY
166        template<typename Expr, typename Context, bool IsMemFunCall>
167        struct memfun_eval
168        {
169        private:
170            typedef typename result_of::child_c<Expr, 0>::type e0;
171            typedef typename result_of::child_c<Expr, 1>::type e1;
172            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
173            typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
174        public:
175            typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type;
176            result_type operator ()(Expr &expr, Context &ctx) const
177            {
178                return detail::mem_ptr_fun<r0, r1>()(
179                    proto::eval(proto::child_c<0>(expr), ctx)
180                  , proto::eval(proto::child_c<1>(expr), ctx)
181                );
182            }
183        };
184
185        /// INTERNAL ONLY
186        template<typename Expr, typename Context>
187        struct memfun_eval<Expr, Context, true>
188        {
189        private:
190            typedef typename result_of::child_c<Expr, 0>::type e0;
191            typedef typename result_of::child_c<Expr, 1>::type e1;
192            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
193            typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
194        public:
195            typedef detail::memfun<r0, r1> result_type;
196            result_type const operator ()(Expr &expr, Context &ctx) const
197            {
198                return detail::memfun<r0, r1>(
199                    proto::eval(proto::child_c<0>(expr), ctx)
200                  , proto::eval(proto::child_c<1>(expr), ctx)
201                );
202            }
203        };
204
205        template<typename Expr, typename Context>
206        struct default_eval<Expr, Context, tag::mem_ptr, 2>
207          : memfun_eval<Expr, Context, is_member_function_eval<Expr, Context>::value>
208        {};
209
210        // Handle post-increment specially.
211        template<typename Expr, typename Context>
212        struct default_eval<Expr, Context, proto::tag::post_inc, 1>
213        {
214        private:
215            typedef typename proto::result_of::child_c<Expr, 0>::type e0;
216            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
217        public:
218            BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type)
219            result_type operator ()(Expr &expr, Context &ctx) const
220            {
221                return proto::eval(proto::child_c<0>(expr), ctx) ++;
222            }
223        };
224
225        // Handle post-decrement specially.
226        template<typename Expr, typename Context>
227        struct default_eval<Expr, Context, proto::tag::post_dec, 1>
228        {
229        private:
230            typedef typename proto::result_of::child_c<Expr, 0>::type e0;
231            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
232        public:
233            BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type)
234            result_type operator ()(Expr &expr, Context &ctx) const
235            {
236                return proto::eval(proto::child_c<0>(expr), ctx) --;
237            }
238        };
239
240        // Handle subscript specially.
241        template<typename Expr, typename Context>
242        struct default_eval<Expr, Context, proto::tag::subscript, 2>
243        {
244        private:
245            typedef typename proto::result_of::child_c<Expr, 0>::type e0;
246            typedef typename proto::result_of::child_c<Expr, 1>::type e1;
247            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
248            typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
249        public:
250            BOOST_PROTO_DECLTYPE_(proto::detail::make_subscriptable<r0>()[proto::detail::make<r1>()], result_type)
251            result_type operator ()(Expr &expr, Context &ctx) const
252            {
253                return proto::eval(proto::child_c<0>(expr), ctx)[proto::eval(proto::child_c<1>(expr), ctx)];
254            }
255        };
256
257        // Handle if_else_ specially.
258        template<typename Expr, typename Context>
259        struct default_eval<Expr, Context, proto::tag::if_else_, 3>
260        {
261        private:
262            typedef typename proto::result_of::child_c<Expr, 0>::type e0;
263            typedef typename proto::result_of::child_c<Expr, 1>::type e1;
264            typedef typename proto::result_of::child_c<Expr, 2>::type e2;
265            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
266            typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
267            typedef typename proto::result_of::eval<UNREF(e2), Context>::type r2;
268        public:
269            BOOST_PROTO_DECLTYPE_(
270                proto::detail::make<r0>()
271              ? proto::detail::make<r1>()
272              : proto::detail::make<r2>()
273              , result_type
274            )
275            result_type operator ()(Expr &expr, Context &ctx) const
276            {
277                return proto::eval(proto::child_c<0>(expr), ctx)
278                      ? proto::eval(proto::child_c<1>(expr), ctx)
279                      : proto::eval(proto::child_c<2>(expr), ctx);
280            }
281        };
282
283        // Handle comma specially.
284        template<typename Expr, typename Context>
285        struct default_eval<Expr, Context, proto::tag::comma, 2>
286        {
287        private:
288            typedef typename proto::result_of::child_c<Expr, 0>::type e0;
289            typedef typename proto::result_of::child_c<Expr, 1>::type e1;
290            typedef typename proto::result_of::eval<UNREF(e0), Context>::type r0;
291            typedef typename proto::result_of::eval<UNREF(e1), Context>::type r1;
292        public:
293            typedef typename proto::detail::comma_result<r0, r1>::type result_type;
294            result_type operator ()(Expr &expr, Context &ctx) const
295            {
296                return proto::eval(proto::child_c<0>(expr), ctx), proto::eval(proto::child_c<1>(expr), ctx);
297            }
298        };
299
300        // Handle function specially
301        #define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA)                                       \
302            typename proto::result_of::eval<                                                    \
303                typename remove_reference<                                                      \
304                    typename proto::result_of::child_c<DATA, N>::type                           \
305                >::type                                                                         \
306              , Context                                                                         \
307            >::type                                                                             \
308            /**/
309
310        #define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA)                                            \
311            proto::eval(proto::child_c<N>(DATA), context)                                       \
312            /**/
313
314        template<typename Expr, typename Context>
315        struct default_eval<Expr, Context, proto::tag::function, 1>
316        {
317            typedef
318                typename proto::detail::result_of_fixup<
319                    BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
320                >::type
321            function_type;
322
323            typedef
324                typename BOOST_PROTO_RESULT_OF<function_type()>::type
325            result_type;
326
327            result_type operator ()(Expr &expr, Context &context) const
328            {
329                return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)();
330            }
331        };
332
333        template<typename Expr, typename Context>
334        struct default_eval<Expr, Context, proto::tag::function, 2>
335        {
336            typedef
337                typename proto::detail::result_of_fixup<
338                    BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr)
339                >::type
340            function_type;
341
342            typedef
343                typename detail::result_of_<
344                    function_type(BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr))
345                >::type
346            result_type;
347
348            result_type operator ()(Expr &expr, Context &context) const
349            {
350                return this->invoke(
351                    expr
352                  , context
353                  , is_member_function_pointer<function_type>()
354                  , is_member_object_pointer<function_type>()
355                );
356            }
357
358        private:
359            result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::false_) const
360            {
361                return BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)(BOOST_PROTO_DEFAULT_EVAL(~, 1, expr));
362            }
363
364            result_type invoke(Expr &expr, Context &context, mpl::true_, mpl::false_) const
365            {
366                BOOST_PROTO_USE_GET_POINTER();
367                typedef typename detail::classtypeof<function_type>::type class_type;
368                return (
369                    BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->* 
370                    BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)
371                )();
372            }
373
374            result_type invoke(Expr &expr, Context &context, mpl::false_, mpl::true_) const
375            {
376                BOOST_PROTO_USE_GET_POINTER();
377                typedef typename detail::classtypeof<function_type>::type class_type;
378                return (
379                    BOOST_PROTO_GET_POINTER(class_type, BOOST_PROTO_DEFAULT_EVAL(~, 1, expr)) ->*
380                    BOOST_PROTO_DEFAULT_EVAL(~, 0, expr)
381                );
382            }
383        };
384
385        // Additional specialization are generated by the preprocessor
386        #include <boost/proto/context/detail/default_eval.hpp>
387
388        #undef BOOST_PROTO_DEFAULT_EVAL_TYPE
389        #undef BOOST_PROTO_DEFAULT_EVAL
390
391        /// default_context
392        ///
393        struct default_context
394        {
395            /// default_context::eval
396            ///
397            template<typename Expr, typename ThisContext = default_context const>
398            struct eval
399              : default_eval<Expr, ThisContext>
400            {};
401        };
402
403    } // namespace context
404
405}} // namespace boost::proto
406
407#undef UNREF
408
409#endif