1 /////////////////////////////////////////////////////////////////////////////// 2 /// \file default.hpp 3 /// Contains definition of the _default transform, which gives operators their 4 /// usual C++ meanings and uses Boost.Typeof to deduce return types. 5 // 6 // Copyright 2008 Eric Niebler. Distributed under the Boost 7 // Software License, Version 1.0. (See accompanying file 8 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 10 #ifndef BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008 11 #define BOOST_PROTO_TRANSFORM_DEFAULT_HPP_EAN_04_04_2008 12 13 #include <boost/preprocessor/iteration/iterate.hpp> 14 #include <boost/preprocessor/repetition/repeat.hpp> 15 #include <boost/preprocessor/arithmetic/add.hpp> 16 #include <boost/preprocessor/arithmetic/sub.hpp> 17 #include <boost/preprocessor/repetition/enum.hpp> 18 #include <boost/preprocessor/repetition/enum_shifted.hpp> 19 #include <boost/preprocessor/repetition/enum_shifted_params.hpp> 20 #include <boost/ref.hpp> 21 #include <boost/get_pointer.hpp> 22 #include <boost/utility/enable_if.hpp> 23 #include <boost/type_traits/is_member_pointer.hpp> 24 #include <boost/type_traits/is_member_object_pointer.hpp> 25 #include <boost/type_traits/is_member_function_pointer.hpp> 26 #include <boost/proto/proto_fwd.hpp> 27 #include <boost/proto/traits.hpp> 28 #include <boost/proto/transform/impl.hpp> 29 #include <boost/proto/transform/arg.hpp> 30 #include <boost/proto/detail/decltype.hpp> 31 32 namespace boost { namespace proto 33 { 34 namespace detail 35 { 36 template<typename Grammar, typename Tag> 37 struct default_case 38 : not_<_> 39 {}; 40 41 template<typename Grammar> 42 struct default_case<Grammar, tag::terminal> 43 : when<terminal<_>, _value> 44 {}; 45 46 template<typename Grammar> 47 struct default_cases 48 { 49 template<typename Tag> 50 struct case_ 51 : default_case<Grammar, Tag> 52 {}; 53 }; 54 55 #define BOOST_PROTO_UNARY_DEFAULT_EVAL(OP, TAG, MAKE) \ 56 template<typename Grammar> \ 57 struct BOOST_PP_CAT(default_, TAG) \ 58 : transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \ 59 { \ 60 template<typename Expr, typename State, typename Data> \ 61 struct impl \ 62 : transform_impl<Expr, State, Data> \ 63 { \ 64 private: \ 65 typedef typename result_of::child_c<Expr, 0>::type e0; \ 66 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; \ 67 public: \ 68 BOOST_PROTO_DECLTYPE_(OP proto::detail::MAKE<r0>(), result_type) \ 69 result_type operator ()( \ 70 typename impl::expr_param e \ 71 , typename impl::state_param s \ 72 , typename impl::data_param d \ 73 ) const \ 74 { \ 75 typename Grammar::template impl<e0, State, Data> t0; \ 76 return OP t0(proto::child_c<0>(e), s, d); \ 77 } \ 78 }; \ 79 }; \ 80 \ 81 template<typename Grammar> \ 82 struct default_case<Grammar, tag::TAG> \ 83 : when<unary_expr<tag::TAG, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \ 84 {}; \ 85 /**/ 86 87 #define BOOST_PROTO_BINARY_DEFAULT_EVAL(OP, TAG, LMAKE, RMAKE) \ 88 template<typename Grammar> \ 89 struct BOOST_PP_CAT(default_, TAG) \ 90 : transform<BOOST_PP_CAT(default_, TAG)<Grammar> > \ 91 { \ 92 template<typename Expr, typename State, typename Data> \ 93 struct impl \ 94 : transform_impl<Expr, State, Data> \ 95 { \ 96 private: \ 97 typedef typename result_of::child_c<Expr, 0>::type e0; \ 98 typedef typename result_of::child_c<Expr, 1>::type e1; \ 99 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; \ 100 typedef typename Grammar::template impl<e1, State, Data>::result_type r1; \ 101 public: \ 102 BOOST_PROTO_DECLTYPE_( \ 103 proto::detail::LMAKE<r0>() OP proto::detail::RMAKE<r1>() \ 104 , result_type \ 105 ) \ 106 result_type operator ()( \ 107 typename impl::expr_param e \ 108 , typename impl::state_param s \ 109 , typename impl::data_param d \ 110 ) const \ 111 { \ 112 typename Grammar::template impl<e0, State, Data> t0; \ 113 typename Grammar::template impl<e1, State, Data> t1; \ 114 return t0(proto::child_c<0>(e), s, d) \ 115 OP t1(proto::child_c<1>(e), s, d); \ 116 } \ 117 }; \ 118 }; \ 119 \ 120 template<typename Grammar> \ 121 struct default_case<Grammar, tag::TAG> \ 122 : when<binary_expr<tag::TAG, Grammar, Grammar>, BOOST_PP_CAT(default_, TAG)<Grammar> > \ 123 {}; \ 124 /**/ 125 126 BOOST_PROTO_UNARY_DEFAULT_EVAL(+, unary_plus, make) 127 BOOST_PROTO_UNARY_DEFAULT_EVAL(-, negate, make) 128 BOOST_PROTO_UNARY_DEFAULT_EVAL(*, dereference, make) 129 BOOST_PROTO_UNARY_DEFAULT_EVAL(~, complement, make) 130 BOOST_PROTO_UNARY_DEFAULT_EVAL(&, address_of, make) 131 BOOST_PROTO_UNARY_DEFAULT_EVAL(!, logical_not, make) 132 BOOST_PROTO_UNARY_DEFAULT_EVAL(++, pre_inc, make_mutable) 133 BOOST_PROTO_UNARY_DEFAULT_EVAL(--, pre_dec, make_mutable) 134 135 BOOST_PROTO_BINARY_DEFAULT_EVAL(<<, shift_left, make_mutable, make) 136 BOOST_PROTO_BINARY_DEFAULT_EVAL(>>, shift_right, make_mutable, make_mutable) 137 BOOST_PROTO_BINARY_DEFAULT_EVAL(*, multiplies, make, make) 138 BOOST_PROTO_BINARY_DEFAULT_EVAL(/, divides, make, make) 139 BOOST_PROTO_BINARY_DEFAULT_EVAL(%, modulus, make, make) 140 BOOST_PROTO_BINARY_DEFAULT_EVAL(+, plus, make, make) 141 BOOST_PROTO_BINARY_DEFAULT_EVAL(-, minus, make, make) 142 BOOST_PROTO_BINARY_DEFAULT_EVAL(<, less, make, make) 143 BOOST_PROTO_BINARY_DEFAULT_EVAL(>, greater, make, make) 144 BOOST_PROTO_BINARY_DEFAULT_EVAL(<=, less_equal, make, make) 145 BOOST_PROTO_BINARY_DEFAULT_EVAL(>=, greater_equal, make, make) 146 BOOST_PROTO_BINARY_DEFAULT_EVAL(==, equal_to, make, make) 147 BOOST_PROTO_BINARY_DEFAULT_EVAL(!=, not_equal_to, make, make) 148 BOOST_PROTO_BINARY_DEFAULT_EVAL(||, logical_or, make, make) 149 BOOST_PROTO_BINARY_DEFAULT_EVAL(&&, logical_and, make, make) 150 BOOST_PROTO_BINARY_DEFAULT_EVAL(&, bitwise_and, make, make) 151 BOOST_PROTO_BINARY_DEFAULT_EVAL(|, bitwise_or, make, make) 152 BOOST_PROTO_BINARY_DEFAULT_EVAL(^, bitwise_xor, make, make) 153 154 BOOST_PROTO_BINARY_DEFAULT_EVAL(=, assign, make_mutable, make) 155 BOOST_PROTO_BINARY_DEFAULT_EVAL(<<=, shift_left_assign, make_mutable, make) 156 BOOST_PROTO_BINARY_DEFAULT_EVAL(>>=, shift_right_assign, make_mutable, make) 157 BOOST_PROTO_BINARY_DEFAULT_EVAL(*=, multiplies_assign, make_mutable, make) 158 BOOST_PROTO_BINARY_DEFAULT_EVAL(/=, divides_assign, make_mutable, make) 159 BOOST_PROTO_BINARY_DEFAULT_EVAL(%=, modulus_assign, make_mutable, make) 160 BOOST_PROTO_BINARY_DEFAULT_EVAL(+=, plus_assign, make_mutable, make) 161 BOOST_PROTO_BINARY_DEFAULT_EVAL(-=, minus_assign, make_mutable, make) 162 BOOST_PROTO_BINARY_DEFAULT_EVAL(&=, bitwise_and_assign, make_mutable, make) 163 BOOST_PROTO_BINARY_DEFAULT_EVAL(|=, bitwise_or_assign, make_mutable, make) 164 BOOST_PROTO_BINARY_DEFAULT_EVAL(^=, bitwise_xor_assign, make_mutable, make) 165 166 #undef BOOST_PROTO_UNARY_DEFAULT_EVAL 167 #undef BOOST_PROTO_BINARY_DEFAULT_EVAL 168 169 /// INTERNAL ONLY 170 template<typename Grammar, typename Expr, typename State, typename Data> 171 struct is_member_function_invocation 172 : is_member_function_pointer< 173 typename uncvref< 174 typename Grammar::template impl< 175 typename result_of::child_c<Expr, 1>::type 176 , State 177 , Data 178 >::result_type 179 >::type 180 > 181 {}; 182 183 /// INTERNAL ONLY 184 template<typename Grammar, typename Expr, typename State, typename Data, bool IsMemFunCall> 185 struct default_mem_ptr_impl 186 : transform_impl<Expr, State, Data> 187 { 188 private: 189 typedef typename result_of::child_c<Expr, 0>::type e0; 190 typedef typename result_of::child_c<Expr, 1>::type e1; 191 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 192 typedef typename Grammar::template impl<e1, State, Data>::result_type r1; 193 public: 194 typedef typename detail::mem_ptr_fun<r0, r1>::result_type result_type; operator ()boost::proto::detail::default_mem_ptr_impl195 result_type operator ()( 196 typename default_mem_ptr_impl::expr_param e 197 , typename default_mem_ptr_impl::state_param s 198 , typename default_mem_ptr_impl::data_param d 199 ) const 200 { 201 typename Grammar::template impl<e0, State, Data> t0; 202 typename Grammar::template impl<e1, State, Data> t1; 203 return detail::mem_ptr_fun<r0, r1>()( 204 t0(proto::child_c<0>(e), s, d) 205 , t1(proto::child_c<1>(e), s, d) 206 ); 207 } 208 }; 209 210 /// INTERNAL ONLY 211 template<typename Grammar, typename Expr, typename State, typename Data> 212 struct default_mem_ptr_impl<Grammar, Expr, State, Data, true> 213 : transform_impl<Expr, State, Data> 214 { 215 private: 216 typedef typename result_of::child_c<Expr, 0>::type e0; 217 typedef typename result_of::child_c<Expr, 1>::type e1; 218 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 219 typedef typename Grammar::template impl<e1, State, Data>::result_type r1; 220 public: 221 typedef detail::memfun<r0, r1> result_type; operator ()boost::proto::detail::default_mem_ptr_impl222 result_type const operator ()( 223 typename default_mem_ptr_impl::expr_param e 224 , typename default_mem_ptr_impl::state_param s 225 , typename default_mem_ptr_impl::data_param d 226 ) const 227 { 228 typename Grammar::template impl<e0, State, Data> t0; 229 typename Grammar::template impl<e1, State, Data> t1; 230 return detail::memfun<r0, r1>( 231 t0(proto::child_c<0>(e), s, d) 232 , t1(proto::child_c<1>(e), s, d) 233 ); 234 } 235 }; 236 237 template<typename Grammar> 238 struct default_mem_ptr 239 : transform<default_mem_ptr<Grammar> > 240 { 241 template<typename Expr, typename State, typename Data> 242 struct impl 243 : default_mem_ptr_impl< 244 Grammar 245 , Expr 246 , State 247 , Data 248 , is_member_function_invocation<Grammar, Expr, State, Data>::value 249 > 250 {}; 251 }; 252 253 template<typename Grammar> 254 struct default_case<Grammar, tag::mem_ptr> 255 : when<mem_ptr<Grammar, Grammar>, default_mem_ptr<Grammar> > 256 {}; 257 258 template<typename Grammar> 259 struct default_post_inc 260 : transform<default_post_inc<Grammar> > 261 { 262 template<typename Expr, typename State, typename Data> 263 struct impl 264 : transform_impl<Expr, State, Data> 265 { 266 private: 267 typedef typename result_of::child_c<Expr, 0>::type e0; 268 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 269 public: 270 BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() ++, result_type) operator ()boost::proto::detail::default_post_inc::impl271 result_type operator ()( 272 typename impl::expr_param e 273 , typename impl::state_param s 274 , typename impl::data_param d 275 ) const 276 { 277 typename Grammar::template impl<e0, State, Data> t0; 278 return t0(proto::child_c<0>(e), s, d) ++; 279 } 280 }; 281 }; 282 283 template<typename Grammar> 284 struct default_case<Grammar, tag::post_inc> 285 : when<post_inc<Grammar>, default_post_inc<Grammar> > 286 {}; 287 288 template<typename Grammar> 289 struct default_post_dec 290 : transform<default_post_dec<Grammar> > 291 { 292 template<typename Expr, typename State, typename Data> 293 struct impl 294 : transform_impl<Expr, State, Data> 295 { 296 private: 297 typedef typename result_of::child_c<Expr, 0>::type e0; 298 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 299 public: 300 BOOST_PROTO_DECLTYPE_(proto::detail::make_mutable<r0>() --, result_type) operator ()boost::proto::detail::default_post_dec::impl301 result_type operator ()( 302 typename impl::expr_param e 303 , typename impl::state_param s 304 , typename impl::data_param d 305 ) const 306 { 307 typename Grammar::template impl<e0, State, Data> t0; 308 return t0(proto::child_c<0>(e), s, d) --; 309 } 310 }; 311 }; 312 313 template<typename Grammar> 314 struct default_case<Grammar, tag::post_dec> 315 : when<post_dec<Grammar>, default_post_dec<Grammar> > 316 {}; 317 318 template<typename Grammar> 319 struct default_subscript 320 : transform<default_subscript<Grammar> > 321 { 322 template<typename Expr, typename State, typename Data> 323 struct impl 324 : transform_impl<Expr, State, Data> 325 { 326 private: 327 typedef typename result_of::child_c<Expr, 0>::type e0; 328 typedef typename result_of::child_c<Expr, 1>::type e1; 329 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 330 typedef typename Grammar::template impl<e1, State, Data>::result_type r1; 331 public: BOOST_PROTO_DECLTYPE_boost::proto::detail::default_subscript::impl332 BOOST_PROTO_DECLTYPE_( 333 proto::detail::make_subscriptable<r0>() [ proto::detail::make<r1>() ] 334 , result_type 335 ) 336 result_type operator ()( 337 typename impl::expr_param e 338 , typename impl::state_param s 339 , typename impl::data_param d 340 ) const 341 { 342 typename Grammar::template impl<e0, State, Data> t0; 343 typename Grammar::template impl<e1, State, Data> t1; 344 return t0(proto::child_c<0>(e), s, d) [ 345 t1(proto::child_c<1>(e), s, d) ]; 346 } 347 }; 348 }; 349 350 template<typename Grammar> 351 struct default_case<Grammar, tag::subscript> 352 : when<subscript<Grammar, Grammar>, default_subscript<Grammar> > 353 {}; 354 355 template<typename Grammar> 356 struct default_if_else_ 357 { 358 template<typename Expr, typename State, typename Data> 359 struct impl 360 : transform_impl<Expr, State, Data> 361 { 362 private: 363 typedef typename result_of::child_c<Expr, 0>::type e0; 364 typedef typename result_of::child_c<Expr, 1>::type e1; 365 typedef typename result_of::child_c<Expr, 2>::type e2; 366 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 367 typedef typename Grammar::template impl<e1, State, Data>::result_type r1; 368 typedef typename Grammar::template impl<e2, State, Data>::result_type r2; 369 public: 370 BOOST_PROTO_DECLTYPE_( 371 proto::detail::make<r0>() 372 ? proto::detail::make<r1>() 373 : proto::detail::make<r2>() 374 , result_type 375 ) operator ()boost::proto::detail::default_if_else_::impl376 result_type operator ()( 377 typename impl::expr_param e 378 , typename impl::state_param s 379 , typename impl::data_param d 380 ) const 381 { 382 typename Grammar::template impl<e0, State, Data> t0; 383 typename Grammar::template impl<e1, State, Data> t1; 384 typename Grammar::template impl<e2, State, Data> t2; 385 return t0(proto::child_c<0>(e), s, d) 386 ? t1(proto::child_c<1>(e), s, d) 387 : t2(proto::child_c<2>(e), s, d); 388 } 389 }; 390 }; 391 392 template<typename Grammar> 393 struct default_case<Grammar, tag::if_else_> 394 : when<if_else_<Grammar, Grammar, Grammar>, default_if_else_<Grammar> > 395 {}; 396 397 template<typename Grammar> 398 struct default_comma 399 : transform<default_comma<Grammar> > 400 { 401 template<typename Expr, typename State, typename Data> 402 struct impl 403 : transform_impl<Expr, State, Data> 404 { 405 private: 406 typedef typename result_of::child_c<Expr, 0>::type e0; 407 typedef typename result_of::child_c<Expr, 1>::type e1; 408 typedef typename Grammar::template impl<e0, State, Data>::result_type r0; 409 typedef typename Grammar::template impl<e1, State, Data>::result_type r1; 410 public: 411 typedef typename proto::detail::comma_result<r0, r1>::type result_type; operator ()boost::proto::detail::default_comma::impl412 result_type operator ()( 413 typename impl::expr_param e 414 , typename impl::state_param s 415 , typename impl::data_param d 416 ) const 417 { 418 typename Grammar::template impl<e0, State, Data> t0; 419 typename Grammar::template impl<e1, State, Data> t1; 420 return t0(proto::child_c<0>(e), s, d) 421 , t1(proto::child_c<1>(e), s, d); 422 } 423 }; 424 }; 425 426 template<typename Grammar> 427 struct default_case<Grammar, tag::comma> 428 : when<comma<Grammar, Grammar>, default_comma<Grammar> > 429 {}; 430 431 template<typename Grammar, typename Expr, typename State, typename Data, long Arity> 432 struct default_function_impl; 433 434 template<typename Grammar> 435 struct default_function 436 : transform<default_function<Grammar> > 437 { 438 template<typename Expr, typename State, typename Data> 439 struct impl 440 : default_function_impl< 441 Grammar 442 , Expr 443 , State 444 , Data 445 , transform_impl<Expr, State, Data>::expr::proto_arity_c 446 > 447 {}; 448 }; 449 450 template<typename Grammar> 451 struct default_case<Grammar, tag::function> 452 : when<function<Grammar, vararg<Grammar> >, default_function<Grammar> > 453 {}; 454 455 #define BOOST_PROTO_DEFAULT_EVAL_TYPE(Z, N, DATA) \ 456 typedef \ 457 typename result_of::child_c<DATA, N>::type \ 458 BOOST_PP_CAT(e, N); \ 459 \ 460 typedef \ 461 typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>::result_type \ 462 BOOST_PP_CAT(r, N); \ 463 /**/ 464 465 #define BOOST_PROTO_DEFAULT_EVAL(Z, N, DATA) \ 466 typename Grammar::template impl<BOOST_PP_CAT(e, N), State, Data>()( \ 467 proto::child_c<N>(DATA), s, d \ 468 ) \ 469 /**/ 470 471 template<typename Grammar, typename Expr, typename State, typename Data> 472 struct default_function_impl<Grammar, Expr, State, Data, 1> 473 : transform_impl<Expr, State, Data> 474 { 475 BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) 476 477 typedef 478 typename proto::detail::result_of_fixup<r0>::type 479 function_type; 480 481 typedef 482 typename BOOST_PROTO_RESULT_OF<function_type()>::type 483 result_type; 484 operator ()boost::proto::detail::default_function_impl485 result_type operator ()( 486 typename default_function_impl::expr_param e 487 , typename default_function_impl::state_param s 488 , typename default_function_impl::data_param d 489 ) const 490 { 491 return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(); 492 } 493 }; 494 495 template<typename Grammar, typename Expr, typename State, typename Data> 496 struct default_function_impl<Grammar, Expr, State, Data, 2> 497 : transform_impl<Expr, State, Data> 498 { 499 BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 0, Expr) 500 BOOST_PROTO_DEFAULT_EVAL_TYPE(~, 1, Expr) 501 502 typedef 503 typename proto::detail::result_of_fixup<r0>::type 504 function_type; 505 506 typedef 507 typename detail::result_of_<function_type(r1)>::type 508 result_type; 509 operator ()boost::proto::detail::default_function_impl510 result_type operator ()( 511 typename default_function_impl::expr_param e 512 , typename default_function_impl::state_param s 513 , typename default_function_impl::data_param d 514 ) const 515 { 516 return this->invoke( 517 e 518 , s 519 , d 520 , is_member_function_pointer<function_type>() 521 , is_member_object_pointer<function_type>() 522 ); 523 } 524 525 private: invokeboost::proto::detail::default_function_impl526 result_type invoke( 527 typename default_function_impl::expr_param e 528 , typename default_function_impl::state_param s 529 , typename default_function_impl::data_param d 530 , mpl::false_ 531 , mpl::false_ 532 ) const 533 { 534 return BOOST_PROTO_DEFAULT_EVAL(~, 0, e)(BOOST_PROTO_DEFAULT_EVAL(~, 1, e)); 535 } 536 invokeboost::proto::detail::default_function_impl537 result_type invoke( 538 typename default_function_impl::expr_param e 539 , typename default_function_impl::state_param s 540 , typename default_function_impl::data_param d 541 , mpl::true_ 542 , mpl::false_ 543 ) const 544 { 545 BOOST_PROTO_USE_GET_POINTER(); 546 typedef typename detail::class_member_traits<function_type>::class_type class_type; 547 return ( 548 BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, e))) ->* 549 BOOST_PROTO_DEFAULT_EVAL(~, 0, e) 550 )(); 551 } 552 invokeboost::proto::detail::default_function_impl553 result_type invoke( 554 typename default_function_impl::expr_param e 555 , typename default_function_impl::state_param s 556 , typename default_function_impl::data_param d 557 , mpl::false_ 558 , mpl::true_ 559 ) const 560 { 561 BOOST_PROTO_USE_GET_POINTER(); 562 typedef typename detail::class_member_traits<function_type>::class_type class_type; 563 return ( 564 BOOST_PROTO_GET_POINTER(class_type, (BOOST_PROTO_DEFAULT_EVAL(~, 1, e))) ->* 565 BOOST_PROTO_DEFAULT_EVAL(~, 0, e) 566 ); 567 } 568 }; 569 570 #include <boost/proto/transform/detail/default_function_impl.hpp> 571 572 #undef BOOST_PROTO_DEFAULT_EVAL_TYPE 573 #undef BOOST_PROTO_DEFAULT_EVAL 574 } 575 576 template<typename Grammar /*= detail::_default*/> 577 struct _default 578 : switch_<detail::default_cases<Grammar> > 579 {}; 580 581 template<typename Grammar> 582 struct is_callable<_default<Grammar> > 583 : mpl::true_ 584 {}; 585 586 namespace detail 587 { 588 // Loopy indirection that allows proto::_default<> to be 589 // used without specifying a Grammar argument. 590 struct _default 591 : proto::_default<> 592 {}; 593 } 594 595 }} 596 597 #endif 598 599