1 // <functional> -*- C++ -*- 2 3 // Copyright (C) 2001-2013 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /* 26 * Copyright (c) 1997 27 * Silicon Graphics Computer Systems, Inc. 28 * 29 * Permission to use, copy, modify, distribute and sell this software 30 * and its documentation for any purpose is hereby granted without fee, 31 * provided that the above copyright notice appear in all copies and 32 * that both that copyright notice and this permission notice appear 33 * in supporting documentation. Silicon Graphics makes no 34 * representations about the suitability of this software for any 35 * purpose. It is provided "as is" without express or implied warranty. 36 * 37 */ 38 39 /** @file include/functional 40 * This is a Standard C++ Library header. 41 */ 42 43 #ifndef _GLIBCXX_FUNCTIONAL 44 #define _GLIBCXX_FUNCTIONAL 1 45 46 #pragma GCC system_header 47 48 #include <bits/c++config.h> 49 #include <bits/stl_function.h> 50 51 #if __cplusplus >= 201103L 52 53 #include <typeinfo> 54 #include <new> 55 #include <tuple> 56 #include <type_traits> 57 #include <bits/functexcept.h> 58 #include <bits/functional_hash.h> 59 60 namespace std _GLIBCXX_VISIBILITY(default) 61 { 62 _GLIBCXX_BEGIN_NAMESPACE_VERSION 63 64 template<typename _MemberPointer> 65 class _Mem_fn; 66 template<typename _Tp, typename _Class> 67 _Mem_fn<_Tp _Class::*> 68 mem_fn(_Tp _Class::*) noexcept; 69 70 _GLIBCXX_HAS_NESTED_TYPE(result_type) 71 72 /// If we have found a result_type, extract it. 73 template<bool _Has_result_type, typename _Functor> 74 struct _Maybe_get_result_type 75 { }; 76 77 template<typename _Functor> 78 struct _Maybe_get_result_type<true, _Functor> 79 { typedef typename _Functor::result_type result_type; }; 80 81 /** 82 * Base class for any function object that has a weak result type, as 83 * defined in 3.3/3 of TR1. 84 */ 85 template<typename _Functor> 86 struct _Weak_result_type_impl 87 : _Maybe_get_result_type<__has_result_type<_Functor>::value, _Functor> 88 { }; 89 90 /// Retrieve the result type for a function type. 91 template<typename _Res, typename... _ArgTypes> 92 struct _Weak_result_type_impl<_Res(_ArgTypes...)> 93 { typedef _Res result_type; }; 94 95 template<typename _Res, typename... _ArgTypes> 96 struct _Weak_result_type_impl<_Res(_ArgTypes......)> 97 { typedef _Res result_type; }; 98 99 template<typename _Res, typename... _ArgTypes> 100 struct _Weak_result_type_impl<_Res(_ArgTypes...) const> 101 { typedef _Res result_type; }; 102 103 template<typename _Res, typename... _ArgTypes> 104 struct _Weak_result_type_impl<_Res(_ArgTypes......) const> 105 { typedef _Res result_type; }; 106 107 template<typename _Res, typename... _ArgTypes> 108 struct _Weak_result_type_impl<_Res(_ArgTypes...) volatile> 109 { typedef _Res result_type; }; 110 111 template<typename _Res, typename... _ArgTypes> 112 struct _Weak_result_type_impl<_Res(_ArgTypes......) volatile> 113 { typedef _Res result_type; }; 114 115 template<typename _Res, typename... _ArgTypes> 116 struct _Weak_result_type_impl<_Res(_ArgTypes...) const volatile> 117 { typedef _Res result_type; }; 118 119 template<typename _Res, typename... _ArgTypes> 120 struct _Weak_result_type_impl<_Res(_ArgTypes......) const volatile> 121 { typedef _Res result_type; }; 122 123 /// Retrieve the result type for a function reference. 124 template<typename _Res, typename... _ArgTypes> 125 struct _Weak_result_type_impl<_Res(&)(_ArgTypes...)> 126 { typedef _Res result_type; }; 127 128 template<typename _Res, typename... _ArgTypes> 129 struct _Weak_result_type_impl<_Res(&)(_ArgTypes......)> 130 { typedef _Res result_type; }; 131 132 /// Retrieve the result type for a function pointer. 133 template<typename _Res, typename... _ArgTypes> 134 struct _Weak_result_type_impl<_Res(*)(_ArgTypes...)> 135 { typedef _Res result_type; }; 136 137 template<typename _Res, typename... _ArgTypes> 138 struct _Weak_result_type_impl<_Res(*)(_ArgTypes......)> 139 { typedef _Res result_type; }; 140 141 /// Retrieve result type for a member function pointer. 142 template<typename _Res, typename _Class, typename... _ArgTypes> 143 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...)> 144 { typedef _Res result_type; }; 145 146 template<typename _Res, typename _Class, typename... _ArgTypes> 147 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......)> 148 { typedef _Res result_type; }; 149 150 /// Retrieve result type for a const member function pointer. 151 template<typename _Res, typename _Class, typename... _ArgTypes> 152 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) const> 153 { typedef _Res result_type; }; 154 155 template<typename _Res, typename _Class, typename... _ArgTypes> 156 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) const> 157 { typedef _Res result_type; }; 158 159 /// Retrieve result type for a volatile member function pointer. 160 template<typename _Res, typename _Class, typename... _ArgTypes> 161 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) volatile> 162 { typedef _Res result_type; }; 163 164 template<typename _Res, typename _Class, typename... _ArgTypes> 165 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) volatile> 166 { typedef _Res result_type; }; 167 168 /// Retrieve result type for a const volatile member function pointer. 169 template<typename _Res, typename _Class, typename... _ArgTypes> 170 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes...) 171 const volatile> 172 { typedef _Res result_type; }; 173 174 template<typename _Res, typename _Class, typename... _ArgTypes> 175 struct _Weak_result_type_impl<_Res (_Class::*)(_ArgTypes......) 176 const volatile> 177 { typedef _Res result_type; }; 178 179 /** 180 * Strip top-level cv-qualifiers from the function object and let 181 * _Weak_result_type_impl perform the real work. 182 */ 183 template<typename _Functor> 184 struct _Weak_result_type 185 : _Weak_result_type_impl<typename remove_cv<_Functor>::type> 186 { }; 187 188 /// Determines if the type _Tp derives from unary_function. 189 template<typename _Tp> 190 struct _Derives_from_unary_function : __sfinae_types 191 { 192 private: 193 template<typename _T1, typename _Res> 194 static __one __test(const volatile unary_function<_T1, _Res>*); 195 196 // It's tempting to change "..." to const volatile void*, but 197 // that fails when _Tp is a function type. 198 static __two __test(...); 199 200 public: 201 static const bool value = sizeof(__test((_Tp*)0)) == 1; 202 }; 203 204 /// Determines if the type _Tp derives from binary_function. 205 template<typename _Tp> 206 struct _Derives_from_binary_function : __sfinae_types 207 { 208 private: 209 template<typename _T1, typename _T2, typename _Res> 210 static __one __test(const volatile binary_function<_T1, _T2, _Res>*); 211 212 // It's tempting to change "..." to const volatile void*, but 213 // that fails when _Tp is a function type. 214 static __two __test(...); 215 216 public: 217 static const bool value = sizeof(__test((_Tp*)0)) == 1; 218 }; 219 220 /** 221 * Invoke a function object, which may be either a member pointer or a 222 * function object. The first parameter will tell which. 223 */ 224 template<typename _Functor, typename... _Args> 225 inline 226 typename enable_if< 227 (!is_member_pointer<_Functor>::value 228 && !is_function<_Functor>::value 229 && !is_function<typename remove_pointer<_Functor>::type>::value), 230 typename result_of<_Functor&(_Args&&...)>::type 231 >::type 232 __invoke(_Functor& __f, _Args&&... __args) 233 { 234 return __f(std::forward<_Args>(__args)...); 235 } 236 237 template<typename _Functor, typename... _Args> 238 inline 239 typename enable_if< 240 (is_member_pointer<_Functor>::value 241 && !is_function<_Functor>::value 242 && !is_function<typename remove_pointer<_Functor>::type>::value), 243 typename result_of<_Functor(_Args&&...)>::type 244 >::type 245 __invoke(_Functor& __f, _Args&&... __args) 246 { 247 return std::mem_fn(__f)(std::forward<_Args>(__args)...); 248 } 249 250 // To pick up function references (that will become function pointers) 251 template<typename _Functor, typename... _Args> 252 inline 253 typename enable_if< 254 (is_pointer<_Functor>::value 255 && is_function<typename remove_pointer<_Functor>::type>::value), 256 typename result_of<_Functor(_Args&&...)>::type 257 >::type 258 __invoke(_Functor __f, _Args&&... __args) 259 { 260 return __f(std::forward<_Args>(__args)...); 261 } 262 263 /** 264 * Knowing which of unary_function and binary_function _Tp derives 265 * from, derives from the same and ensures that reference_wrapper 266 * will have a weak result type. See cases below. 267 */ 268 template<bool _Unary, bool _Binary, typename _Tp> 269 struct _Reference_wrapper_base_impl; 270 271 // None of the nested argument types. 272 template<typename _Tp> 273 struct _Reference_wrapper_base_impl<false, false, _Tp> 274 : _Weak_result_type<_Tp> 275 { }; 276 277 // Nested argument_type only. 278 template<typename _Tp> 279 struct _Reference_wrapper_base_impl<true, false, _Tp> 280 : _Weak_result_type<_Tp> 281 { 282 typedef typename _Tp::argument_type argument_type; 283 }; 284 285 // Nested first_argument_type and second_argument_type only. 286 template<typename _Tp> 287 struct _Reference_wrapper_base_impl<false, true, _Tp> 288 : _Weak_result_type<_Tp> 289 { 290 typedef typename _Tp::first_argument_type first_argument_type; 291 typedef typename _Tp::second_argument_type second_argument_type; 292 }; 293 294 // All the nested argument types. 295 template<typename _Tp> 296 struct _Reference_wrapper_base_impl<true, true, _Tp> 297 : _Weak_result_type<_Tp> 298 { 299 typedef typename _Tp::argument_type argument_type; 300 typedef typename _Tp::first_argument_type first_argument_type; 301 typedef typename _Tp::second_argument_type second_argument_type; 302 }; 303 304 _GLIBCXX_HAS_NESTED_TYPE(argument_type) 305 _GLIBCXX_HAS_NESTED_TYPE(first_argument_type) 306 _GLIBCXX_HAS_NESTED_TYPE(second_argument_type) 307 308 /** 309 * Derives from unary_function or binary_function when it 310 * can. Specializations handle all of the easy cases. The primary 311 * template determines what to do with a class type, which may 312 * derive from both unary_function and binary_function. 313 */ 314 template<typename _Tp> 315 struct _Reference_wrapper_base 316 : _Reference_wrapper_base_impl< 317 __has_argument_type<_Tp>::value, 318 __has_first_argument_type<_Tp>::value 319 && __has_second_argument_type<_Tp>::value, 320 _Tp> 321 { }; 322 323 // - a function type (unary) 324 template<typename _Res, typename _T1> 325 struct _Reference_wrapper_base<_Res(_T1)> 326 : unary_function<_T1, _Res> 327 { }; 328 329 template<typename _Res, typename _T1> 330 struct _Reference_wrapper_base<_Res(_T1) const> 331 : unary_function<_T1, _Res> 332 { }; 333 334 template<typename _Res, typename _T1> 335 struct _Reference_wrapper_base<_Res(_T1) volatile> 336 : unary_function<_T1, _Res> 337 { }; 338 339 template<typename _Res, typename _T1> 340 struct _Reference_wrapper_base<_Res(_T1) const volatile> 341 : unary_function<_T1, _Res> 342 { }; 343 344 // - a function type (binary) 345 template<typename _Res, typename _T1, typename _T2> 346 struct _Reference_wrapper_base<_Res(_T1, _T2)> 347 : binary_function<_T1, _T2, _Res> 348 { }; 349 350 template<typename _Res, typename _T1, typename _T2> 351 struct _Reference_wrapper_base<_Res(_T1, _T2) const> 352 : binary_function<_T1, _T2, _Res> 353 { }; 354 355 template<typename _Res, typename _T1, typename _T2> 356 struct _Reference_wrapper_base<_Res(_T1, _T2) volatile> 357 : binary_function<_T1, _T2, _Res> 358 { }; 359 360 template<typename _Res, typename _T1, typename _T2> 361 struct _Reference_wrapper_base<_Res(_T1, _T2) const volatile> 362 : binary_function<_T1, _T2, _Res> 363 { }; 364 365 // - a function pointer type (unary) 366 template<typename _Res, typename _T1> 367 struct _Reference_wrapper_base<_Res(*)(_T1)> 368 : unary_function<_T1, _Res> 369 { }; 370 371 // - a function pointer type (binary) 372 template<typename _Res, typename _T1, typename _T2> 373 struct _Reference_wrapper_base<_Res(*)(_T1, _T2)> 374 : binary_function<_T1, _T2, _Res> 375 { }; 376 377 // - a pointer to member function type (unary, no qualifiers) 378 template<typename _Res, typename _T1> 379 struct _Reference_wrapper_base<_Res (_T1::*)()> 380 : unary_function<_T1*, _Res> 381 { }; 382 383 // - a pointer to member function type (binary, no qualifiers) 384 template<typename _Res, typename _T1, typename _T2> 385 struct _Reference_wrapper_base<_Res (_T1::*)(_T2)> 386 : binary_function<_T1*, _T2, _Res> 387 { }; 388 389 // - a pointer to member function type (unary, const) 390 template<typename _Res, typename _T1> 391 struct _Reference_wrapper_base<_Res (_T1::*)() const> 392 : unary_function<const _T1*, _Res> 393 { }; 394 395 // - a pointer to member function type (binary, const) 396 template<typename _Res, typename _T1, typename _T2> 397 struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const> 398 : binary_function<const _T1*, _T2, _Res> 399 { }; 400 401 // - a pointer to member function type (unary, volatile) 402 template<typename _Res, typename _T1> 403 struct _Reference_wrapper_base<_Res (_T1::*)() volatile> 404 : unary_function<volatile _T1*, _Res> 405 { }; 406 407 // - a pointer to member function type (binary, volatile) 408 template<typename _Res, typename _T1, typename _T2> 409 struct _Reference_wrapper_base<_Res (_T1::*)(_T2) volatile> 410 : binary_function<volatile _T1*, _T2, _Res> 411 { }; 412 413 // - a pointer to member function type (unary, const volatile) 414 template<typename _Res, typename _T1> 415 struct _Reference_wrapper_base<_Res (_T1::*)() const volatile> 416 : unary_function<const volatile _T1*, _Res> 417 { }; 418 419 // - a pointer to member function type (binary, const volatile) 420 template<typename _Res, typename _T1, typename _T2> 421 struct _Reference_wrapper_base<_Res (_T1::*)(_T2) const volatile> 422 : binary_function<const volatile _T1*, _T2, _Res> 423 { }; 424 425 /** 426 * @brief Primary class template for reference_wrapper. 427 * @ingroup functors 428 * @{ 429 */ 430 template<typename _Tp> 431 class reference_wrapper 432 : public _Reference_wrapper_base<typename remove_cv<_Tp>::type> 433 { 434 _Tp* _M_data; 435 436 public: 437 typedef _Tp type; 438 439 reference_wrapper(_Tp& __indata) noexcept 440 : _M_data(std::__addressof(__indata)) 441 { } 442 443 reference_wrapper(_Tp&&) = delete; 444 445 reference_wrapper(const reference_wrapper<_Tp>& __inref) noexcept 446 : _M_data(__inref._M_data) 447 { } 448 449 reference_wrapper& 450 operator=(const reference_wrapper<_Tp>& __inref) noexcept 451 { 452 _M_data = __inref._M_data; 453 return *this; 454 } 455 456 operator _Tp&() const noexcept 457 { return this->get(); } 458 459 _Tp& 460 get() const noexcept 461 { return *_M_data; } 462 463 template<typename... _Args> 464 typename result_of<_Tp&(_Args&&...)>::type 465 operator()(_Args&&... __args) const 466 { 467 return __invoke(get(), std::forward<_Args>(__args)...); 468 } 469 }; 470 471 472 /// Denotes a reference should be taken to a variable. 473 template<typename _Tp> 474 inline reference_wrapper<_Tp> 475 ref(_Tp& __t) noexcept 476 { return reference_wrapper<_Tp>(__t); } 477 478 /// Denotes a const reference should be taken to a variable. 479 template<typename _Tp> 480 inline reference_wrapper<const _Tp> 481 cref(const _Tp& __t) noexcept 482 { return reference_wrapper<const _Tp>(__t); } 483 484 template<typename _Tp> 485 void ref(const _Tp&&) = delete; 486 487 template<typename _Tp> 488 void cref(const _Tp&&) = delete; 489 490 /// Partial specialization. 491 template<typename _Tp> 492 inline reference_wrapper<_Tp> 493 ref(reference_wrapper<_Tp> __t) noexcept 494 { return ref(__t.get()); } 495 496 /// Partial specialization. 497 template<typename _Tp> 498 inline reference_wrapper<const _Tp> 499 cref(reference_wrapper<_Tp> __t) noexcept 500 { return cref(__t.get()); } 501 502 // @} group functors 503 504 template<typename... _Types> 505 struct _Pack : integral_constant<size_t, sizeof...(_Types)> 506 { }; 507 508 template<typename _From, typename _To, bool = _From::value == _To::value> 509 struct _AllConvertible : false_type 510 { }; 511 512 template<typename... _From, typename... _To> 513 struct _AllConvertible<_Pack<_From...>, _Pack<_To...>, true> 514 : __and_<is_convertible<_From, _To>...> 515 { }; 516 517 template<typename _Tp1, typename _Tp2> 518 using _NotSame = __not_<is_same<typename std::decay<_Tp1>::type, 519 typename std::decay<_Tp2>::type>>; 520 521 /** 522 * Derives from @c unary_function or @c binary_function, or perhaps 523 * nothing, depending on the number of arguments provided. The 524 * primary template is the basis case, which derives nothing. 525 */ 526 template<typename _Res, typename... _ArgTypes> 527 struct _Maybe_unary_or_binary_function { }; 528 529 /// Derives from @c unary_function, as appropriate. 530 template<typename _Res, typename _T1> 531 struct _Maybe_unary_or_binary_function<_Res, _T1> 532 : std::unary_function<_T1, _Res> { }; 533 534 /// Derives from @c binary_function, as appropriate. 535 template<typename _Res, typename _T1, typename _T2> 536 struct _Maybe_unary_or_binary_function<_Res, _T1, _T2> 537 : std::binary_function<_T1, _T2, _Res> { }; 538 539 /// Implementation of @c mem_fn for member function pointers. 540 template<typename _Res, typename _Class, typename... _ArgTypes> 541 class _Mem_fn<_Res (_Class::*)(_ArgTypes...)> 542 : public _Maybe_unary_or_binary_function<_Res, _Class*, _ArgTypes...> 543 { 544 typedef _Res (_Class::*_Functor)(_ArgTypes...); 545 546 template<typename _Tp, typename... _Args> 547 _Res 548 _M_call(_Tp&& __object, const volatile _Class *, 549 _Args&&... __args) const 550 { 551 return (std::forward<_Tp>(__object).*__pmf) 552 (std::forward<_Args>(__args)...); 553 } 554 555 template<typename _Tp, typename... _Args> 556 _Res 557 _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const 558 { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); } 559 560 // Require each _Args to be convertible to corresponding _ArgTypes 561 template<typename... _Args> 562 using _RequireValidArgs 563 = _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 564 565 // Require each _Args to be convertible to corresponding _ArgTypes 566 // and require _Tp is not _Class, _Class& or _Class* 567 template<typename _Tp, typename... _Args> 568 using _RequireValidArgs2 569 = _Require<_NotSame<_Class, _Tp>, _NotSame<_Class*, _Tp>, 570 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 571 572 // Require each _Args to be convertible to corresponding _ArgTypes 573 // and require _Tp is _Class or derived from _Class 574 template<typename _Tp, typename... _Args> 575 using _RequireValidArgs3 576 = _Require<is_base_of<_Class, _Tp>, 577 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 578 579 public: 580 typedef _Res result_type; 581 582 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } 583 584 // Handle objects 585 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 586 _Res 587 operator()(_Class& __object, _Args&&... __args) const 588 { return (__object.*__pmf)(std::forward<_Args>(__args)...); } 589 590 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 591 _Res 592 operator()(_Class&& __object, _Args&&... __args) const 593 { 594 return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...); 595 } 596 597 // Handle pointers 598 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 599 _Res 600 operator()(_Class* __object, _Args&&... __args) const 601 { return (__object->*__pmf)(std::forward<_Args>(__args)...); } 602 603 // Handle smart pointers, references and pointers to derived 604 template<typename _Tp, typename... _Args, 605 typename _Req = _RequireValidArgs2<_Tp, _Args...>> 606 _Res 607 operator()(_Tp&& __object, _Args&&... __args) const 608 { 609 return _M_call(std::forward<_Tp>(__object), &__object, 610 std::forward<_Args>(__args)...); 611 } 612 613 template<typename _Tp, typename... _Args, 614 typename _Req = _RequireValidArgs3<_Tp, _Args...>> 615 _Res 616 operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const 617 { return operator()(__ref.get(), std::forward<_Args>(__args)...); } 618 619 private: 620 _Functor __pmf; 621 }; 622 623 /// Implementation of @c mem_fn for const member function pointers. 624 template<typename _Res, typename _Class, typename... _ArgTypes> 625 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const> 626 : public _Maybe_unary_or_binary_function<_Res, const _Class*, 627 _ArgTypes...> 628 { 629 typedef _Res (_Class::*_Functor)(_ArgTypes...) const; 630 631 template<typename _Tp, typename... _Args> 632 _Res 633 _M_call(_Tp&& __object, const volatile _Class *, 634 _Args&&... __args) const 635 { 636 return (std::forward<_Tp>(__object).*__pmf) 637 (std::forward<_Args>(__args)...); 638 } 639 640 template<typename _Tp, typename... _Args> 641 _Res 642 _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const 643 { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); } 644 645 template<typename... _Args> 646 using _RequireValidArgs 647 = _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 648 649 template<typename _Tp, typename... _Args> 650 using _RequireValidArgs2 651 = _Require<_NotSame<_Class, _Tp>, _NotSame<const _Class*, _Tp>, 652 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 653 654 template<typename _Tp, typename... _Args> 655 using _RequireValidArgs3 656 = _Require<is_base_of<_Class, _Tp>, 657 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 658 659 public: 660 typedef _Res result_type; 661 662 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } 663 664 // Handle objects 665 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 666 _Res 667 operator()(const _Class& __object, _Args&&... __args) const 668 { return (__object.*__pmf)(std::forward<_Args>(__args)...); } 669 670 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 671 _Res 672 operator()(const _Class&& __object, _Args&&... __args) const 673 { 674 return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...); 675 } 676 677 // Handle pointers 678 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 679 _Res 680 operator()(const _Class* __object, _Args&&... __args) const 681 { return (__object->*__pmf)(std::forward<_Args>(__args)...); } 682 683 // Handle smart pointers, references and pointers to derived 684 template<typename _Tp, typename... _Args, 685 typename _Req = _RequireValidArgs2<_Tp, _Args...>> 686 _Res operator()(_Tp&& __object, _Args&&... __args) const 687 { 688 return _M_call(std::forward<_Tp>(__object), &__object, 689 std::forward<_Args>(__args)...); 690 } 691 692 template<typename _Tp, typename... _Args, 693 typename _Req = _RequireValidArgs3<_Tp, _Args...>> 694 _Res 695 operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const 696 { return operator()(__ref.get(), std::forward<_Args>(__args)...); } 697 698 private: 699 _Functor __pmf; 700 }; 701 702 /// Implementation of @c mem_fn for volatile member function pointers. 703 template<typename _Res, typename _Class, typename... _ArgTypes> 704 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) volatile> 705 : public _Maybe_unary_or_binary_function<_Res, volatile _Class*, 706 _ArgTypes...> 707 { 708 typedef _Res (_Class::*_Functor)(_ArgTypes...) volatile; 709 710 template<typename _Tp, typename... _Args> 711 _Res 712 _M_call(_Tp&& __object, const volatile _Class *, 713 _Args&&... __args) const 714 { 715 return (std::forward<_Tp>(__object).*__pmf) 716 (std::forward<_Args>(__args)...); 717 } 718 719 template<typename _Tp, typename... _Args> 720 _Res 721 _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const 722 { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); } 723 724 template<typename... _Args> 725 using _RequireValidArgs 726 = _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 727 728 template<typename _Tp, typename... _Args> 729 using _RequireValidArgs2 730 = _Require<_NotSame<_Class, _Tp>, _NotSame<volatile _Class*, _Tp>, 731 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 732 733 template<typename _Tp, typename... _Args> 734 using _RequireValidArgs3 735 = _Require<is_base_of<_Class, _Tp>, 736 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 737 738 public: 739 typedef _Res result_type; 740 741 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } 742 743 // Handle objects 744 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 745 _Res 746 operator()(volatile _Class& __object, _Args&&... __args) const 747 { return (__object.*__pmf)(std::forward<_Args>(__args)...); } 748 749 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 750 _Res 751 operator()(volatile _Class&& __object, _Args&&... __args) const 752 { 753 return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...); 754 } 755 756 // Handle pointers 757 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 758 _Res 759 operator()(volatile _Class* __object, _Args&&... __args) const 760 { return (__object->*__pmf)(std::forward<_Args>(__args)...); } 761 762 // Handle smart pointers, references and pointers to derived 763 template<typename _Tp, typename... _Args, 764 typename _Req = _RequireValidArgs2<_Tp, _Args...>> 765 _Res 766 operator()(_Tp&& __object, _Args&&... __args) const 767 { 768 return _M_call(std::forward<_Tp>(__object), &__object, 769 std::forward<_Args>(__args)...); 770 } 771 772 template<typename _Tp, typename... _Args, 773 typename _Req = _RequireValidArgs3<_Tp, _Args...>> 774 _Res 775 operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const 776 { return operator()(__ref.get(), std::forward<_Args>(__args)...); } 777 778 private: 779 _Functor __pmf; 780 }; 781 782 /// Implementation of @c mem_fn for const volatile member function pointers. 783 template<typename _Res, typename _Class, typename... _ArgTypes> 784 class _Mem_fn<_Res (_Class::*)(_ArgTypes...) const volatile> 785 : public _Maybe_unary_or_binary_function<_Res, const volatile _Class*, 786 _ArgTypes...> 787 { 788 typedef _Res (_Class::*_Functor)(_ArgTypes...) const volatile; 789 790 template<typename _Tp, typename... _Args> 791 _Res 792 _M_call(_Tp&& __object, const volatile _Class *, 793 _Args&&... __args) const 794 { 795 return (std::forward<_Tp>(__object).*__pmf) 796 (std::forward<_Args>(__args)...); 797 } 798 799 template<typename _Tp, typename... _Args> 800 _Res 801 _M_call(_Tp&& __ptr, const volatile void *, _Args&&... __args) const 802 { return ((*__ptr).*__pmf)(std::forward<_Args>(__args)...); } 803 804 template<typename... _Args> 805 using _RequireValidArgs 806 = _Require<_AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 807 808 template<typename _Tp, typename... _Args> 809 using _RequireValidArgs2 810 = _Require<_NotSame<_Class, _Tp>, 811 _NotSame<const volatile _Class*, _Tp>, 812 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 813 814 template<typename _Tp, typename... _Args> 815 using _RequireValidArgs3 816 = _Require<is_base_of<_Class, _Tp>, 817 _AllConvertible<_Pack<_Args...>, _Pack<_ArgTypes...>>>; 818 819 public: 820 typedef _Res result_type; 821 822 explicit _Mem_fn(_Functor __pmf) : __pmf(__pmf) { } 823 824 // Handle objects 825 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 826 _Res 827 operator()(const volatile _Class& __object, _Args&&... __args) const 828 { return (__object.*__pmf)(std::forward<_Args>(__args)...); } 829 830 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 831 _Res 832 operator()(const volatile _Class&& __object, _Args&&... __args) const 833 { 834 return (std::move(__object).*__pmf)(std::forward<_Args>(__args)...); 835 } 836 837 // Handle pointers 838 template<typename... _Args, typename _Req = _RequireValidArgs<_Args...>> 839 _Res 840 operator()(const volatile _Class* __object, _Args&&... __args) const 841 { return (__object->*__pmf)(std::forward<_Args>(__args)...); } 842 843 // Handle smart pointers, references and pointers to derived 844 template<typename _Tp, typename... _Args, 845 typename _Req = _RequireValidArgs2<_Tp, _Args...>> 846 _Res operator()(_Tp&& __object, _Args&&... __args) const 847 { 848 return _M_call(std::forward<_Tp>(__object), &__object, 849 std::forward<_Args>(__args)...); 850 } 851 852 template<typename _Tp, typename... _Args, 853 typename _Req = _RequireValidArgs3<_Tp, _Args...>> 854 _Res 855 operator()(reference_wrapper<_Tp> __ref, _Args&&... __args) const 856 { return operator()(__ref.get(), std::forward<_Args>(__args)...); } 857 858 private: 859 _Functor __pmf; 860 }; 861 862 863 template<typename _Tp, bool> 864 struct _Mem_fn_const_or_non 865 { 866 typedef const _Tp& type; 867 }; 868 869 template<typename _Tp> 870 struct _Mem_fn_const_or_non<_Tp, false> 871 { 872 typedef _Tp& type; 873 }; 874 875 template<typename _Res, typename _Class> 876 class _Mem_fn<_Res _Class::*> 877 { 878 using __pm_type = _Res _Class::*; 879 880 // This bit of genius is due to Peter Dimov, improved slightly by 881 // Douglas Gregor. 882 // Made less elegant to support perfect forwarding and noexcept. 883 template<typename _Tp> 884 auto 885 _M_call(_Tp&& __object, const _Class *) const noexcept 886 -> decltype(std::forward<_Tp>(__object).*std::declval<__pm_type&>()) 887 { return std::forward<_Tp>(__object).*__pm; } 888 889 template<typename _Tp, typename _Up> 890 auto 891 _M_call(_Tp&& __object, _Up * const *) const noexcept 892 -> decltype((*std::forward<_Tp>(__object)).*std::declval<__pm_type&>()) 893 { return (*std::forward<_Tp>(__object)).*__pm; } 894 895 template<typename _Tp> 896 auto 897 _M_call(_Tp&& __ptr, const volatile void*) const 898 noexcept(noexcept((*__ptr).*std::declval<__pm_type&>())) 899 -> decltype((*__ptr).*std::declval<__pm_type&>()) 900 { return (*__ptr).*__pm; } 901 902 public: 903 explicit 904 _Mem_fn(_Res _Class::*__pm) noexcept : __pm(__pm) { } 905 906 // Handle objects 907 _Res& 908 operator()(_Class& __object) const noexcept 909 { return __object.*__pm; } 910 911 const _Res& 912 operator()(const _Class& __object) const noexcept 913 { return __object.*__pm; } 914 915 _Res&& 916 operator()(_Class&& __object) const noexcept 917 { return std::forward<_Class>(__object).*__pm; } 918 919 const _Res&& 920 operator()(const _Class&& __object) const noexcept 921 { return std::forward<const _Class>(__object).*__pm; } 922 923 // Handle pointers 924 _Res& 925 operator()(_Class* __object) const noexcept 926 { return __object->*__pm; } 927 928 const _Res& 929 operator()(const _Class* __object) const noexcept 930 { return __object->*__pm; } 931 932 // Handle smart pointers and derived 933 template<typename _Tp, typename _Req = _Require<_NotSame<_Class*, _Tp>>> 934 auto 935 operator()(_Tp&& __unknown) const 936 noexcept(noexcept(std::declval<_Mem_fn*>()->_M_call 937 (std::forward<_Tp>(__unknown), &__unknown))) 938 -> decltype(this->_M_call(std::forward<_Tp>(__unknown), &__unknown)) 939 { return _M_call(std::forward<_Tp>(__unknown), &__unknown); } 940 941 template<typename _Tp, typename _Req = _Require<is_base_of<_Class, _Tp>>> 942 auto 943 operator()(reference_wrapper<_Tp> __ref) const 944 noexcept(noexcept(std::declval<_Mem_fn&>()(__ref.get()))) 945 -> decltype((*this)(__ref.get())) 946 { return (*this)(__ref.get()); } 947 948 private: 949 _Res _Class::*__pm; 950 }; 951 952 // _GLIBCXX_RESOLVE_LIB_DEFECTS 953 // 2048. Unnecessary mem_fn overloads 954 /** 955 * @brief Returns a function object that forwards to the member 956 * pointer @a pm. 957 * @ingroup functors 958 */ 959 template<typename _Tp, typename _Class> 960 inline _Mem_fn<_Tp _Class::*> 961 mem_fn(_Tp _Class::* __pm) noexcept 962 { 963 return _Mem_fn<_Tp _Class::*>(__pm); 964 } 965 966 /** 967 * @brief Determines if the given type _Tp is a function object 968 * should be treated as a subexpression when evaluating calls to 969 * function objects returned by bind(). [TR1 3.6.1] 970 * @ingroup binders 971 */ 972 template<typename _Tp> 973 struct is_bind_expression 974 : public false_type { }; 975 976 /** 977 * @brief Determines if the given type _Tp is a placeholder in a 978 * bind() expression and, if so, which placeholder it is. [TR1 3.6.2] 979 * @ingroup binders 980 */ 981 template<typename _Tp> 982 struct is_placeholder 983 : public integral_constant<int, 0> 984 { }; 985 986 /** @brief The type of placeholder objects defined by libstdc++. 987 * @ingroup binders 988 */ 989 template<int _Num> struct _Placeholder { }; 990 991 _GLIBCXX_END_NAMESPACE_VERSION 992 993 /** @namespace std::placeholders 994 * @brief ISO C++11 entities sub-namespace for functional. 995 * @ingroup binders 996 */ 997 namespace placeholders 998 { 999 _GLIBCXX_BEGIN_NAMESPACE_VERSION 1000 /* Define a large number of placeholders. There is no way to 1001 * simplify this with variadic templates, because we're introducing 1002 * unique names for each. 1003 */ 1004 extern const _Placeholder<1> _1; 1005 extern const _Placeholder<2> _2; 1006 extern const _Placeholder<3> _3; 1007 extern const _Placeholder<4> _4; 1008 extern const _Placeholder<5> _5; 1009 extern const _Placeholder<6> _6; 1010 extern const _Placeholder<7> _7; 1011 extern const _Placeholder<8> _8; 1012 extern const _Placeholder<9> _9; 1013 extern const _Placeholder<10> _10; 1014 extern const _Placeholder<11> _11; 1015 extern const _Placeholder<12> _12; 1016 extern const _Placeholder<13> _13; 1017 extern const _Placeholder<14> _14; 1018 extern const _Placeholder<15> _15; 1019 extern const _Placeholder<16> _16; 1020 extern const _Placeholder<17> _17; 1021 extern const _Placeholder<18> _18; 1022 extern const _Placeholder<19> _19; 1023 extern const _Placeholder<20> _20; 1024 extern const _Placeholder<21> _21; 1025 extern const _Placeholder<22> _22; 1026 extern const _Placeholder<23> _23; 1027 extern const _Placeholder<24> _24; 1028 extern const _Placeholder<25> _25; 1029 extern const _Placeholder<26> _26; 1030 extern const _Placeholder<27> _27; 1031 extern const _Placeholder<28> _28; 1032 extern const _Placeholder<29> _29; 1033 _GLIBCXX_END_NAMESPACE_VERSION 1034 } 1035 1036 _GLIBCXX_BEGIN_NAMESPACE_VERSION 1037 1038 /** 1039 * Partial specialization of is_placeholder that provides the placeholder 1040 * number for the placeholder objects defined by libstdc++. 1041 * @ingroup binders 1042 */ 1043 template<int _Num> 1044 struct is_placeholder<_Placeholder<_Num> > 1045 : public integral_constant<int, _Num> 1046 { }; 1047 1048 template<int _Num> 1049 struct is_placeholder<const _Placeholder<_Num> > 1050 : public integral_constant<int, _Num> 1051 { }; 1052 1053 /** 1054 * Used by _Safe_tuple_element to indicate that there is no tuple 1055 * element at this position. 1056 */ 1057 struct _No_tuple_element; 1058 1059 /** 1060 * Implementation helper for _Safe_tuple_element. This primary 1061 * template handles the case where it is safe to use @c 1062 * tuple_element. 1063 */ 1064 template<std::size_t __i, typename _Tuple, bool _IsSafe> 1065 struct _Safe_tuple_element_impl 1066 : tuple_element<__i, _Tuple> { }; 1067 1068 /** 1069 * Implementation helper for _Safe_tuple_element. This partial 1070 * specialization handles the case where it is not safe to use @c 1071 * tuple_element. We just return @c _No_tuple_element. 1072 */ 1073 template<std::size_t __i, typename _Tuple> 1074 struct _Safe_tuple_element_impl<__i, _Tuple, false> 1075 { 1076 typedef _No_tuple_element type; 1077 }; 1078 1079 /** 1080 * Like tuple_element, but returns @c _No_tuple_element when 1081 * tuple_element would return an error. 1082 */ 1083 template<std::size_t __i, typename _Tuple> 1084 struct _Safe_tuple_element 1085 : _Safe_tuple_element_impl<__i, _Tuple, 1086 (__i < tuple_size<_Tuple>::value)> 1087 { }; 1088 1089 /** 1090 * Maps an argument to bind() into an actual argument to the bound 1091 * function object [TR1 3.6.3/5]. Only the first parameter should 1092 * be specified: the rest are used to determine among the various 1093 * implementations. Note that, although this class is a function 1094 * object, it isn't entirely normal because it takes only two 1095 * parameters regardless of the number of parameters passed to the 1096 * bind expression. The first parameter is the bound argument and 1097 * the second parameter is a tuple containing references to the 1098 * rest of the arguments. 1099 */ 1100 template<typename _Arg, 1101 bool _IsBindExp = is_bind_expression<_Arg>::value, 1102 bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)> 1103 class _Mu; 1104 1105 /** 1106 * If the argument is reference_wrapper<_Tp>, returns the 1107 * underlying reference. [TR1 3.6.3/5 bullet 1] 1108 */ 1109 template<typename _Tp> 1110 class _Mu<reference_wrapper<_Tp>, false, false> 1111 { 1112 public: 1113 typedef _Tp& result_type; 1114 1115 /* Note: This won't actually work for const volatile 1116 * reference_wrappers, because reference_wrapper::get() is const 1117 * but not volatile-qualified. This might be a defect in the TR. 1118 */ 1119 template<typename _CVRef, typename _Tuple> 1120 result_type 1121 operator()(_CVRef& __arg, _Tuple&) const volatile 1122 { return __arg.get(); } 1123 }; 1124 1125 /** 1126 * If the argument is a bind expression, we invoke the underlying 1127 * function object with the same cv-qualifiers as we are given and 1128 * pass along all of our arguments (unwrapped). [TR1 3.6.3/5 bullet 2] 1129 */ 1130 template<typename _Arg> 1131 class _Mu<_Arg, true, false> 1132 { 1133 public: 1134 template<typename _CVArg, typename... _Args> 1135 auto 1136 operator()(_CVArg& __arg, 1137 tuple<_Args...>& __tuple) const volatile 1138 -> decltype(__arg(declval<_Args>()...)) 1139 { 1140 // Construct an index tuple and forward to __call 1141 typedef typename _Build_index_tuple<sizeof...(_Args)>::__type 1142 _Indexes; 1143 return this->__call(__arg, __tuple, _Indexes()); 1144 } 1145 1146 private: 1147 // Invokes the underlying function object __arg by unpacking all 1148 // of the arguments in the tuple. 1149 template<typename _CVArg, typename... _Args, std::size_t... _Indexes> 1150 auto 1151 __call(_CVArg& __arg, tuple<_Args...>& __tuple, 1152 const _Index_tuple<_Indexes...>&) const volatile 1153 -> decltype(__arg(declval<_Args>()...)) 1154 { 1155 return __arg(std::forward<_Args>(get<_Indexes>(__tuple))...); 1156 } 1157 }; 1158 1159 /** 1160 * If the argument is a placeholder for the Nth argument, returns 1161 * a reference to the Nth argument to the bind function object. 1162 * [TR1 3.6.3/5 bullet 3] 1163 */ 1164 template<typename _Arg> 1165 class _Mu<_Arg, false, true> 1166 { 1167 public: 1168 template<typename _Signature> class result; 1169 1170 template<typename _CVMu, typename _CVArg, typename _Tuple> 1171 class result<_CVMu(_CVArg, _Tuple)> 1172 { 1173 // Add a reference, if it hasn't already been done for us. 1174 // This allows us to be a little bit sloppy in constructing 1175 // the tuple that we pass to result_of<...>. 1176 typedef typename _Safe_tuple_element<(is_placeholder<_Arg>::value 1177 - 1), _Tuple>::type 1178 __base_type; 1179 1180 public: 1181 typedef typename add_rvalue_reference<__base_type>::type type; 1182 }; 1183 1184 template<typename _Tuple> 1185 typename result<_Mu(_Arg, _Tuple)>::type 1186 operator()(const volatile _Arg&, _Tuple& __tuple) const volatile 1187 { 1188 return std::forward<typename result<_Mu(_Arg, _Tuple)>::type>( 1189 ::std::get<(is_placeholder<_Arg>::value - 1)>(__tuple)); 1190 } 1191 }; 1192 1193 /** 1194 * If the argument is just a value, returns a reference to that 1195 * value. The cv-qualifiers on the reference are the same as the 1196 * cv-qualifiers on the _Mu object. [TR1 3.6.3/5 bullet 4] 1197 */ 1198 template<typename _Arg> 1199 class _Mu<_Arg, false, false> 1200 { 1201 public: 1202 template<typename _Signature> struct result; 1203 1204 template<typename _CVMu, typename _CVArg, typename _Tuple> 1205 struct result<_CVMu(_CVArg, _Tuple)> 1206 { 1207 typedef typename add_lvalue_reference<_CVArg>::type type; 1208 }; 1209 1210 // Pick up the cv-qualifiers of the argument 1211 template<typename _CVArg, typename _Tuple> 1212 _CVArg&& 1213 operator()(_CVArg&& __arg, _Tuple&) const volatile 1214 { return std::forward<_CVArg>(__arg); } 1215 }; 1216 1217 /** 1218 * Maps member pointers into instances of _Mem_fn but leaves all 1219 * other function objects untouched. Used by tr1::bind(). The 1220 * primary template handles the non--member-pointer case. 1221 */ 1222 template<typename _Tp> 1223 struct _Maybe_wrap_member_pointer 1224 { 1225 typedef _Tp type; 1226 1227 static const _Tp& 1228 __do_wrap(const _Tp& __x) 1229 { return __x; } 1230 1231 static _Tp&& 1232 __do_wrap(_Tp&& __x) 1233 { return static_cast<_Tp&&>(__x); } 1234 }; 1235 1236 /** 1237 * Maps member pointers into instances of _Mem_fn but leaves all 1238 * other function objects untouched. Used by tr1::bind(). This 1239 * partial specialization handles the member pointer case. 1240 */ 1241 template<typename _Tp, typename _Class> 1242 struct _Maybe_wrap_member_pointer<_Tp _Class::*> 1243 { 1244 typedef _Mem_fn<_Tp _Class::*> type; 1245 1246 static type 1247 __do_wrap(_Tp _Class::* __pm) 1248 { return type(__pm); } 1249 }; 1250 1251 // Specialization needed to prevent "forming reference to void" errors when 1252 // bind<void>() is called, because argument deduction instantiates 1253 // _Maybe_wrap_member_pointer<void> outside the immediate context where 1254 // SFINAE applies. 1255 template<> 1256 struct _Maybe_wrap_member_pointer<void> 1257 { 1258 typedef void type; 1259 }; 1260 1261 // std::get<I> for volatile-qualified tuples 1262 template<std::size_t _Ind, typename... _Tp> 1263 inline auto 1264 __volget(volatile tuple<_Tp...>& __tuple) 1265 -> typename tuple_element<_Ind, tuple<_Tp...>>::type volatile& 1266 { return std::get<_Ind>(const_cast<tuple<_Tp...>&>(__tuple)); } 1267 1268 // std::get<I> for const-volatile-qualified tuples 1269 template<std::size_t _Ind, typename... _Tp> 1270 inline auto 1271 __volget(const volatile tuple<_Tp...>& __tuple) 1272 -> typename tuple_element<_Ind, tuple<_Tp...>>::type const volatile& 1273 { return std::get<_Ind>(const_cast<const tuple<_Tp...>&>(__tuple)); } 1274 1275 /// Type of the function object returned from bind(). 1276 template<typename _Signature> 1277 struct _Bind; 1278 1279 template<typename _Functor, typename... _Bound_args> 1280 class _Bind<_Functor(_Bound_args...)> 1281 : public _Weak_result_type<_Functor> 1282 { 1283 typedef _Bind __self_type; 1284 typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type 1285 _Bound_indexes; 1286 1287 _Functor _M_f; 1288 tuple<_Bound_args...> _M_bound_args; 1289 1290 // Call unqualified 1291 template<typename _Result, typename... _Args, std::size_t... _Indexes> 1292 _Result 1293 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) 1294 { 1295 return _M_f(_Mu<_Bound_args>() 1296 (get<_Indexes>(_M_bound_args), __args)...); 1297 } 1298 1299 // Call as const 1300 template<typename _Result, typename... _Args, std::size_t... _Indexes> 1301 _Result 1302 __call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const 1303 { 1304 return _M_f(_Mu<_Bound_args>() 1305 (get<_Indexes>(_M_bound_args), __args)...); 1306 } 1307 1308 // Call as volatile 1309 template<typename _Result, typename... _Args, std::size_t... _Indexes> 1310 _Result 1311 __call_v(tuple<_Args...>&& __args, 1312 _Index_tuple<_Indexes...>) volatile 1313 { 1314 return _M_f(_Mu<_Bound_args>() 1315 (__volget<_Indexes>(_M_bound_args), __args)...); 1316 } 1317 1318 // Call as const volatile 1319 template<typename _Result, typename... _Args, std::size_t... _Indexes> 1320 _Result 1321 __call_c_v(tuple<_Args...>&& __args, 1322 _Index_tuple<_Indexes...>) const volatile 1323 { 1324 return _M_f(_Mu<_Bound_args>() 1325 (__volget<_Indexes>(_M_bound_args), __args)...); 1326 } 1327 1328 public: 1329 template<typename... _Args> 1330 explicit _Bind(const _Functor& __f, _Args&&... __args) 1331 : _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...) 1332 { } 1333 1334 template<typename... _Args> 1335 explicit _Bind(_Functor&& __f, _Args&&... __args) 1336 : _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...) 1337 { } 1338 1339 _Bind(const _Bind&) = default; 1340 1341 _Bind(_Bind&& __b) 1342 : _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args)) 1343 { } 1344 1345 // Call unqualified 1346 template<typename... _Args, typename _Result 1347 = decltype( std::declval<_Functor>()( 1348 _Mu<_Bound_args>()( std::declval<_Bound_args&>(), 1349 std::declval<tuple<_Args...>&>() )... ) )> 1350 _Result 1351 operator()(_Args&&... __args) 1352 { 1353 return this->__call<_Result>( 1354 std::forward_as_tuple(std::forward<_Args>(__args)...), 1355 _Bound_indexes()); 1356 } 1357 1358 // Call as const 1359 template<typename... _Args, typename _Result 1360 = decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0), 1361 typename add_const<_Functor>::type>::type>()( 1362 _Mu<_Bound_args>()( std::declval<const _Bound_args&>(), 1363 std::declval<tuple<_Args...>&>() )... ) )> 1364 _Result 1365 operator()(_Args&&... __args) const 1366 { 1367 return this->__call_c<_Result>( 1368 std::forward_as_tuple(std::forward<_Args>(__args)...), 1369 _Bound_indexes()); 1370 } 1371 1372 // Call as volatile 1373 template<typename... _Args, typename _Result 1374 = decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0), 1375 typename add_volatile<_Functor>::type>::type>()( 1376 _Mu<_Bound_args>()( std::declval<volatile _Bound_args&>(), 1377 std::declval<tuple<_Args...>&>() )... ) )> 1378 _Result 1379 operator()(_Args&&... __args) volatile 1380 { 1381 return this->__call_v<_Result>( 1382 std::forward_as_tuple(std::forward<_Args>(__args)...), 1383 _Bound_indexes()); 1384 } 1385 1386 // Call as const volatile 1387 template<typename... _Args, typename _Result 1388 = decltype( std::declval<typename enable_if<(sizeof...(_Args) >= 0), 1389 typename add_cv<_Functor>::type>::type>()( 1390 _Mu<_Bound_args>()( std::declval<const volatile _Bound_args&>(), 1391 std::declval<tuple<_Args...>&>() )... ) )> 1392 _Result 1393 operator()(_Args&&... __args) const volatile 1394 { 1395 return this->__call_c_v<_Result>( 1396 std::forward_as_tuple(std::forward<_Args>(__args)...), 1397 _Bound_indexes()); 1398 } 1399 }; 1400 1401 /// Type of the function object returned from bind<R>(). 1402 template<typename _Result, typename _Signature> 1403 struct _Bind_result; 1404 1405 template<typename _Result, typename _Functor, typename... _Bound_args> 1406 class _Bind_result<_Result, _Functor(_Bound_args...)> 1407 { 1408 typedef _Bind_result __self_type; 1409 typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type 1410 _Bound_indexes; 1411 1412 _Functor _M_f; 1413 tuple<_Bound_args...> _M_bound_args; 1414 1415 // sfinae types 1416 template<typename _Res> 1417 struct __enable_if_void : enable_if<is_void<_Res>::value, int> { }; 1418 template<typename _Res> 1419 struct __disable_if_void : enable_if<!is_void<_Res>::value, int> { }; 1420 1421 // Call unqualified 1422 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1423 _Result 1424 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1425 typename __disable_if_void<_Res>::type = 0) 1426 { 1427 return _M_f(_Mu<_Bound_args>() 1428 (get<_Indexes>(_M_bound_args), __args)...); 1429 } 1430 1431 // Call unqualified, return void 1432 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1433 void 1434 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1435 typename __enable_if_void<_Res>::type = 0) 1436 { 1437 _M_f(_Mu<_Bound_args>() 1438 (get<_Indexes>(_M_bound_args), __args)...); 1439 } 1440 1441 // Call as const 1442 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1443 _Result 1444 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1445 typename __disable_if_void<_Res>::type = 0) const 1446 { 1447 return _M_f(_Mu<_Bound_args>() 1448 (get<_Indexes>(_M_bound_args), __args)...); 1449 } 1450 1451 // Call as const, return void 1452 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1453 void 1454 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1455 typename __enable_if_void<_Res>::type = 0) const 1456 { 1457 _M_f(_Mu<_Bound_args>() 1458 (get<_Indexes>(_M_bound_args), __args)...); 1459 } 1460 1461 // Call as volatile 1462 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1463 _Result 1464 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1465 typename __disable_if_void<_Res>::type = 0) volatile 1466 { 1467 return _M_f(_Mu<_Bound_args>() 1468 (__volget<_Indexes>(_M_bound_args), __args)...); 1469 } 1470 1471 // Call as volatile, return void 1472 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1473 void 1474 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1475 typename __enable_if_void<_Res>::type = 0) volatile 1476 { 1477 _M_f(_Mu<_Bound_args>() 1478 (__volget<_Indexes>(_M_bound_args), __args)...); 1479 } 1480 1481 // Call as const volatile 1482 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1483 _Result 1484 __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>, 1485 typename __disable_if_void<_Res>::type = 0) const volatile 1486 { 1487 return _M_f(_Mu<_Bound_args>() 1488 (__volget<_Indexes>(_M_bound_args), __args)...); 1489 } 1490 1491 // Call as const volatile, return void 1492 template<typename _Res, typename... _Args, std::size_t... _Indexes> 1493 void 1494 __call(tuple<_Args...>&& __args, 1495 _Index_tuple<_Indexes...>, 1496 typename __enable_if_void<_Res>::type = 0) const volatile 1497 { 1498 _M_f(_Mu<_Bound_args>() 1499 (__volget<_Indexes>(_M_bound_args), __args)...); 1500 } 1501 1502 public: 1503 typedef _Result result_type; 1504 1505 template<typename... _Args> 1506 explicit _Bind_result(const _Functor& __f, _Args&&... __args) 1507 : _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...) 1508 { } 1509 1510 template<typename... _Args> 1511 explicit _Bind_result(_Functor&& __f, _Args&&... __args) 1512 : _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...) 1513 { } 1514 1515 _Bind_result(const _Bind_result&) = default; 1516 1517 _Bind_result(_Bind_result&& __b) 1518 : _M_f(std::move(__b._M_f)), _M_bound_args(std::move(__b._M_bound_args)) 1519 { } 1520 1521 // Call unqualified 1522 template<typename... _Args> 1523 result_type 1524 operator()(_Args&&... __args) 1525 { 1526 return this->__call<_Result>( 1527 std::forward_as_tuple(std::forward<_Args>(__args)...), 1528 _Bound_indexes()); 1529 } 1530 1531 // Call as const 1532 template<typename... _Args> 1533 result_type 1534 operator()(_Args&&... __args) const 1535 { 1536 return this->__call<_Result>( 1537 std::forward_as_tuple(std::forward<_Args>(__args)...), 1538 _Bound_indexes()); 1539 } 1540 1541 // Call as volatile 1542 template<typename... _Args> 1543 result_type 1544 operator()(_Args&&... __args) volatile 1545 { 1546 return this->__call<_Result>( 1547 std::forward_as_tuple(std::forward<_Args>(__args)...), 1548 _Bound_indexes()); 1549 } 1550 1551 // Call as const volatile 1552 template<typename... _Args> 1553 result_type 1554 operator()(_Args&&... __args) const volatile 1555 { 1556 return this->__call<_Result>( 1557 std::forward_as_tuple(std::forward<_Args>(__args)...), 1558 _Bound_indexes()); 1559 } 1560 }; 1561 1562 /** 1563 * @brief Class template _Bind is always a bind expression. 1564 * @ingroup binders 1565 */ 1566 template<typename _Signature> 1567 struct is_bind_expression<_Bind<_Signature> > 1568 : public true_type { }; 1569 1570 /** 1571 * @brief Class template _Bind is always a bind expression. 1572 * @ingroup binders 1573 */ 1574 template<typename _Signature> 1575 struct is_bind_expression<const _Bind<_Signature> > 1576 : public true_type { }; 1577 1578 /** 1579 * @brief Class template _Bind is always a bind expression. 1580 * @ingroup binders 1581 */ 1582 template<typename _Signature> 1583 struct is_bind_expression<volatile _Bind<_Signature> > 1584 : public true_type { }; 1585 1586 /** 1587 * @brief Class template _Bind is always a bind expression. 1588 * @ingroup binders 1589 */ 1590 template<typename _Signature> 1591 struct is_bind_expression<const volatile _Bind<_Signature>> 1592 : public true_type { }; 1593 1594 /** 1595 * @brief Class template _Bind_result is always a bind expression. 1596 * @ingroup binders 1597 */ 1598 template<typename _Result, typename _Signature> 1599 struct is_bind_expression<_Bind_result<_Result, _Signature>> 1600 : public true_type { }; 1601 1602 /** 1603 * @brief Class template _Bind_result is always a bind expression. 1604 * @ingroup binders 1605 */ 1606 template<typename _Result, typename _Signature> 1607 struct is_bind_expression<const _Bind_result<_Result, _Signature>> 1608 : public true_type { }; 1609 1610 /** 1611 * @brief Class template _Bind_result is always a bind expression. 1612 * @ingroup binders 1613 */ 1614 template<typename _Result, typename _Signature> 1615 struct is_bind_expression<volatile _Bind_result<_Result, _Signature>> 1616 : public true_type { }; 1617 1618 /** 1619 * @brief Class template _Bind_result is always a bind expression. 1620 * @ingroup binders 1621 */ 1622 template<typename _Result, typename _Signature> 1623 struct is_bind_expression<const volatile _Bind_result<_Result, _Signature>> 1624 : public true_type { }; 1625 1626 // Trait type used to remove std::bind() from overload set via SFINAE 1627 // when first argument has integer type, so that std::bind() will 1628 // not be a better match than ::bind() from the BSD Sockets API. 1629 template<typename _Tp, typename _Tp2 = typename decay<_Tp>::type> 1630 using __is_socketlike = __or_<is_integral<_Tp2>, is_enum<_Tp2>>; 1631 1632 template<bool _SocketLike, typename _Func, typename... _BoundArgs> 1633 struct _Bind_helper 1634 { 1635 typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type> 1636 __maybe_type; 1637 typedef typename __maybe_type::type __func_type; 1638 typedef _Bind<__func_type(typename decay<_BoundArgs>::type...)> type; 1639 }; 1640 1641 // Partial specialization for is_socketlike == true, does not define 1642 // nested type so std::bind() will not participate in overload resolution 1643 // when the first argument might be a socket file descriptor. 1644 template<typename _Func, typename... _BoundArgs> 1645 struct _Bind_helper<true, _Func, _BoundArgs...> 1646 { }; 1647 1648 /** 1649 * @brief Function template for std::bind. 1650 * @ingroup binders 1651 */ 1652 template<typename _Func, typename... _BoundArgs> 1653 inline typename 1654 _Bind_helper<__is_socketlike<_Func>::value, _Func, _BoundArgs...>::type 1655 bind(_Func&& __f, _BoundArgs&&... __args) 1656 { 1657 typedef _Bind_helper<false, _Func, _BoundArgs...> __helper_type; 1658 typedef typename __helper_type::__maybe_type __maybe_type; 1659 typedef typename __helper_type::type __result_type; 1660 return __result_type(__maybe_type::__do_wrap(std::forward<_Func>(__f)), 1661 std::forward<_BoundArgs>(__args)...); 1662 } 1663 1664 template<typename _Result, typename _Func, typename... _BoundArgs> 1665 struct _Bindres_helper 1666 { 1667 typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type> 1668 __maybe_type; 1669 typedef typename __maybe_type::type __functor_type; 1670 typedef _Bind_result<_Result, 1671 __functor_type(typename decay<_BoundArgs>::type...)> 1672 type; 1673 }; 1674 1675 /** 1676 * @brief Function template for std::bind<R>. 1677 * @ingroup binders 1678 */ 1679 template<typename _Result, typename _Func, typename... _BoundArgs> 1680 inline 1681 typename _Bindres_helper<_Result, _Func, _BoundArgs...>::type 1682 bind(_Func&& __f, _BoundArgs&&... __args) 1683 { 1684 typedef _Bindres_helper<_Result, _Func, _BoundArgs...> __helper_type; 1685 typedef typename __helper_type::__maybe_type __maybe_type; 1686 typedef typename __helper_type::type __result_type; 1687 return __result_type(__maybe_type::__do_wrap(std::forward<_Func>(__f)), 1688 std::forward<_BoundArgs>(__args)...); 1689 } 1690 1691 template<typename _Signature> 1692 struct _Bind_simple; 1693 1694 template<typename _Callable, typename... _Args> 1695 struct _Bind_simple<_Callable(_Args...)> 1696 { 1697 typedef typename result_of<_Callable(_Args...)>::type result_type; 1698 1699 template<typename... _Args2, typename = typename 1700 enable_if< sizeof...(_Args) == sizeof...(_Args2)>::type> 1701 explicit 1702 _Bind_simple(const _Callable& __callable, _Args2&&... __args) 1703 : _M_bound(__callable, std::forward<_Args2>(__args)...) 1704 { } 1705 1706 template<typename... _Args2, typename = typename 1707 enable_if< sizeof...(_Args) == sizeof...(_Args2)>::type> 1708 explicit 1709 _Bind_simple(_Callable&& __callable, _Args2&&... __args) 1710 : _M_bound(std::move(__callable), std::forward<_Args2>(__args)...) 1711 { } 1712 1713 _Bind_simple(const _Bind_simple&) = default; 1714 _Bind_simple(_Bind_simple&&) = default; 1715 1716 result_type 1717 operator()() 1718 { 1719 typedef typename _Build_index_tuple<sizeof...(_Args)>::__type _Indices; 1720 return _M_invoke(_Indices()); 1721 } 1722 1723 private: 1724 1725 template<std::size_t... _Indices> 1726 typename result_of<_Callable(_Args...)>::type 1727 _M_invoke(_Index_tuple<_Indices...>) 1728 { 1729 // std::bind always forwards bound arguments as lvalues, 1730 // but this type can call functions which only accept rvalues. 1731 return std::forward<_Callable>(std::get<0>(_M_bound))( 1732 std::forward<_Args>(std::get<_Indices+1>(_M_bound))...); 1733 } 1734 1735 std::tuple<_Callable, _Args...> _M_bound; 1736 }; 1737 1738 template<typename _Func, typename... _BoundArgs> 1739 struct _Bind_simple_helper 1740 { 1741 typedef _Maybe_wrap_member_pointer<typename decay<_Func>::type> 1742 __maybe_type; 1743 typedef typename __maybe_type::type __func_type; 1744 typedef _Bind_simple<__func_type(typename decay<_BoundArgs>::type...)> 1745 __type; 1746 }; 1747 1748 // Simplified version of std::bind for internal use, without support for 1749 // unbound arguments, placeholders or nested bind expressions. 1750 template<typename _Callable, typename... _Args> 1751 typename _Bind_simple_helper<_Callable, _Args...>::__type 1752 __bind_simple(_Callable&& __callable, _Args&&... __args) 1753 { 1754 typedef _Bind_simple_helper<_Callable, _Args...> __helper_type; 1755 typedef typename __helper_type::__maybe_type __maybe_type; 1756 typedef typename __helper_type::__type __result_type; 1757 return __result_type( 1758 __maybe_type::__do_wrap( std::forward<_Callable>(__callable)), 1759 std::forward<_Args>(__args)...); 1760 } 1761 1762 /** 1763 * @brief Exception class thrown when class template function's 1764 * operator() is called with an empty target. 1765 * @ingroup exceptions 1766 */ 1767 class bad_function_call : public std::exception 1768 { 1769 public: 1770 virtual ~bad_function_call() noexcept; 1771 1772 const char* what() const noexcept; 1773 }; 1774 1775 /** 1776 * Trait identifying "location-invariant" types, meaning that the 1777 * address of the object (or any of its members) will not escape. 1778 * Also implies a trivial copy constructor and assignment operator. 1779 */ 1780 template<typename _Tp> 1781 struct __is_location_invariant 1782 : integral_constant<bool, (is_pointer<_Tp>::value 1783 || is_member_pointer<_Tp>::value)> 1784 { }; 1785 1786 class _Undefined_class; 1787 1788 union _Nocopy_types 1789 { 1790 void* _M_object; 1791 const void* _M_const_object; 1792 void (*_M_function_pointer)(); 1793 void (_Undefined_class::*_M_member_pointer)(); 1794 }; 1795 1796 union _Any_data 1797 { 1798 void* _M_access() { return &_M_pod_data[0]; } 1799 const void* _M_access() const { return &_M_pod_data[0]; } 1800 1801 template<typename _Tp> 1802 _Tp& 1803 _M_access() 1804 { return *static_cast<_Tp*>(_M_access()); } 1805 1806 template<typename _Tp> 1807 const _Tp& 1808 _M_access() const 1809 { return *static_cast<const _Tp*>(_M_access()); } 1810 1811 _Nocopy_types _M_unused; 1812 char _M_pod_data[sizeof(_Nocopy_types)]; 1813 }; 1814 1815 enum _Manager_operation 1816 { 1817 __get_type_info, 1818 __get_functor_ptr, 1819 __clone_functor, 1820 __destroy_functor 1821 }; 1822 1823 // Simple type wrapper that helps avoid annoying const problems 1824 // when casting between void pointers and pointers-to-pointers. 1825 template<typename _Tp> 1826 struct _Simple_type_wrapper 1827 { 1828 _Simple_type_wrapper(_Tp __value) : __value(__value) { } 1829 1830 _Tp __value; 1831 }; 1832 1833 template<typename _Tp> 1834 struct __is_location_invariant<_Simple_type_wrapper<_Tp> > 1835 : __is_location_invariant<_Tp> 1836 { }; 1837 1838 // Converts a reference to a function object into a callable 1839 // function object. 1840 template<typename _Functor> 1841 inline _Functor& 1842 __callable_functor(_Functor& __f) 1843 { return __f; } 1844 1845 template<typename _Member, typename _Class> 1846 inline _Mem_fn<_Member _Class::*> 1847 __callable_functor(_Member _Class::* &__p) 1848 { return std::mem_fn(__p); } 1849 1850 template<typename _Member, typename _Class> 1851 inline _Mem_fn<_Member _Class::*> 1852 __callable_functor(_Member _Class::* const &__p) 1853 { return std::mem_fn(__p); } 1854 1855 template<typename _Member, typename _Class> 1856 inline _Mem_fn<_Member _Class::*> 1857 __callable_functor(_Member _Class::* volatile &__p) 1858 { return std::mem_fn(__p); } 1859 1860 template<typename _Member, typename _Class> 1861 inline _Mem_fn<_Member _Class::*> 1862 __callable_functor(_Member _Class::* const volatile &__p) 1863 { return std::mem_fn(__p); } 1864 1865 template<typename _Signature> 1866 class function; 1867 1868 /// Base class of all polymorphic function object wrappers. 1869 class _Function_base 1870 { 1871 public: 1872 static const std::size_t _M_max_size = sizeof(_Nocopy_types); 1873 static const std::size_t _M_max_align = __alignof__(_Nocopy_types); 1874 1875 template<typename _Functor> 1876 class _Base_manager 1877 { 1878 protected: 1879 static const bool __stored_locally = 1880 (__is_location_invariant<_Functor>::value 1881 && sizeof(_Functor) <= _M_max_size 1882 && __alignof__(_Functor) <= _M_max_align 1883 && (_M_max_align % __alignof__(_Functor) == 0)); 1884 1885 typedef integral_constant<bool, __stored_locally> _Local_storage; 1886 1887 // Retrieve a pointer to the function object 1888 static _Functor* 1889 _M_get_pointer(const _Any_data& __source) 1890 { 1891 const _Functor* __ptr = 1892 __stored_locally? std::__addressof(__source._M_access<_Functor>()) 1893 /* have stored a pointer */ : __source._M_access<_Functor*>(); 1894 return const_cast<_Functor*>(__ptr); 1895 } 1896 1897 // Clone a location-invariant function object that fits within 1898 // an _Any_data structure. 1899 static void 1900 _M_clone(_Any_data& __dest, const _Any_data& __source, true_type) 1901 { 1902 new (__dest._M_access()) _Functor(__source._M_access<_Functor>()); 1903 } 1904 1905 // Clone a function object that is not location-invariant or 1906 // that cannot fit into an _Any_data structure. 1907 static void 1908 _M_clone(_Any_data& __dest, const _Any_data& __source, false_type) 1909 { 1910 __dest._M_access<_Functor*>() = 1911 new _Functor(*__source._M_access<_Functor*>()); 1912 } 1913 1914 // Destroying a location-invariant object may still require 1915 // destruction. 1916 static void 1917 _M_destroy(_Any_data& __victim, true_type) 1918 { 1919 __victim._M_access<_Functor>().~_Functor(); 1920 } 1921 1922 // Destroying an object located on the heap. 1923 static void 1924 _M_destroy(_Any_data& __victim, false_type) 1925 { 1926 delete __victim._M_access<_Functor*>(); 1927 } 1928 1929 public: 1930 static bool 1931 _M_manager(_Any_data& __dest, const _Any_data& __source, 1932 _Manager_operation __op) 1933 { 1934 switch (__op) 1935 { 1936 #ifdef __GXX_RTTI 1937 case __get_type_info: 1938 __dest._M_access<const type_info*>() = &typeid(_Functor); 1939 break; 1940 #endif 1941 case __get_functor_ptr: 1942 __dest._M_access<_Functor*>() = _M_get_pointer(__source); 1943 break; 1944 1945 case __clone_functor: 1946 _M_clone(__dest, __source, _Local_storage()); 1947 break; 1948 1949 case __destroy_functor: 1950 _M_destroy(__dest, _Local_storage()); 1951 break; 1952 } 1953 return false; 1954 } 1955 1956 static void 1957 _M_init_functor(_Any_data& __functor, _Functor&& __f) 1958 { _M_init_functor(__functor, std::move(__f), _Local_storage()); } 1959 1960 template<typename _Signature> 1961 static bool 1962 _M_not_empty_function(const function<_Signature>& __f) 1963 { return static_cast<bool>(__f); } 1964 1965 template<typename _Tp> 1966 static bool 1967 _M_not_empty_function(_Tp* const& __fp) 1968 { return __fp; } 1969 1970 template<typename _Class, typename _Tp> 1971 static bool 1972 _M_not_empty_function(_Tp _Class::* const& __mp) 1973 { return __mp; } 1974 1975 template<typename _Tp> 1976 static bool 1977 _M_not_empty_function(const _Tp&) 1978 { return true; } 1979 1980 private: 1981 static void 1982 _M_init_functor(_Any_data& __functor, _Functor&& __f, true_type) 1983 { new (__functor._M_access()) _Functor(std::move(__f)); } 1984 1985 static void 1986 _M_init_functor(_Any_data& __functor, _Functor&& __f, false_type) 1987 { __functor._M_access<_Functor*>() = new _Functor(std::move(__f)); } 1988 }; 1989 1990 template<typename _Functor> 1991 class _Ref_manager : public _Base_manager<_Functor*> 1992 { 1993 typedef _Function_base::_Base_manager<_Functor*> _Base; 1994 1995 public: 1996 static bool 1997 _M_manager(_Any_data& __dest, const _Any_data& __source, 1998 _Manager_operation __op) 1999 { 2000 switch (__op) 2001 { 2002 #ifdef __GXX_RTTI 2003 case __get_type_info: 2004 __dest._M_access<const type_info*>() = &typeid(_Functor); 2005 break; 2006 #endif 2007 case __get_functor_ptr: 2008 __dest._M_access<_Functor*>() = *_Base::_M_get_pointer(__source); 2009 return is_const<_Functor>::value; 2010 break; 2011 2012 default: 2013 _Base::_M_manager(__dest, __source, __op); 2014 } 2015 return false; 2016 } 2017 2018 static void 2019 _M_init_functor(_Any_data& __functor, reference_wrapper<_Functor> __f) 2020 { 2021 _Base::_M_init_functor(__functor, std::__addressof(__f.get())); 2022 } 2023 }; 2024 2025 _Function_base() : _M_manager(0) { } 2026 2027 ~_Function_base() 2028 { 2029 if (_M_manager) 2030 _M_manager(_M_functor, _M_functor, __destroy_functor); 2031 } 2032 2033 2034 bool _M_empty() const { return !_M_manager; } 2035 2036 typedef bool (*_Manager_type)(_Any_data&, const _Any_data&, 2037 _Manager_operation); 2038 2039 _Any_data _M_functor; 2040 _Manager_type _M_manager; 2041 }; 2042 2043 template<typename _Signature, typename _Functor> 2044 class _Function_handler; 2045 2046 template<typename _Res, typename _Functor, typename... _ArgTypes> 2047 class _Function_handler<_Res(_ArgTypes...), _Functor> 2048 : public _Function_base::_Base_manager<_Functor> 2049 { 2050 typedef _Function_base::_Base_manager<_Functor> _Base; 2051 2052 public: 2053 static _Res 2054 _M_invoke(const _Any_data& __functor, _ArgTypes... __args) 2055 { 2056 return (*_Base::_M_get_pointer(__functor))( 2057 std::forward<_ArgTypes>(__args)...); 2058 } 2059 }; 2060 2061 template<typename _Functor, typename... _ArgTypes> 2062 class _Function_handler<void(_ArgTypes...), _Functor> 2063 : public _Function_base::_Base_manager<_Functor> 2064 { 2065 typedef _Function_base::_Base_manager<_Functor> _Base; 2066 2067 public: 2068 static void 2069 _M_invoke(const _Any_data& __functor, _ArgTypes... __args) 2070 { 2071 (*_Base::_M_get_pointer(__functor))( 2072 std::forward<_ArgTypes>(__args)...); 2073 } 2074 }; 2075 2076 template<typename _Res, typename _Functor, typename... _ArgTypes> 2077 class _Function_handler<_Res(_ArgTypes...), reference_wrapper<_Functor> > 2078 : public _Function_base::_Ref_manager<_Functor> 2079 { 2080 typedef _Function_base::_Ref_manager<_Functor> _Base; 2081 2082 public: 2083 static _Res 2084 _M_invoke(const _Any_data& __functor, _ArgTypes... __args) 2085 { 2086 return __callable_functor(**_Base::_M_get_pointer(__functor))( 2087 std::forward<_ArgTypes>(__args)...); 2088 } 2089 }; 2090 2091 template<typename _Functor, typename... _ArgTypes> 2092 class _Function_handler<void(_ArgTypes...), reference_wrapper<_Functor> > 2093 : public _Function_base::_Ref_manager<_Functor> 2094 { 2095 typedef _Function_base::_Ref_manager<_Functor> _Base; 2096 2097 public: 2098 static void 2099 _M_invoke(const _Any_data& __functor, _ArgTypes... __args) 2100 { 2101 __callable_functor(**_Base::_M_get_pointer(__functor))( 2102 std::forward<_ArgTypes>(__args)...); 2103 } 2104 }; 2105 2106 template<typename _Class, typename _Member, typename _Res, 2107 typename... _ArgTypes> 2108 class _Function_handler<_Res(_ArgTypes...), _Member _Class::*> 2109 : public _Function_handler<void(_ArgTypes...), _Member _Class::*> 2110 { 2111 typedef _Function_handler<void(_ArgTypes...), _Member _Class::*> 2112 _Base; 2113 2114 public: 2115 static _Res 2116 _M_invoke(const _Any_data& __functor, _ArgTypes... __args) 2117 { 2118 return std::mem_fn(_Base::_M_get_pointer(__functor)->__value)( 2119 std::forward<_ArgTypes>(__args)...); 2120 } 2121 }; 2122 2123 template<typename _Class, typename _Member, typename... _ArgTypes> 2124 class _Function_handler<void(_ArgTypes...), _Member _Class::*> 2125 : public _Function_base::_Base_manager< 2126 _Simple_type_wrapper< _Member _Class::* > > 2127 { 2128 typedef _Member _Class::* _Functor; 2129 typedef _Simple_type_wrapper<_Functor> _Wrapper; 2130 typedef _Function_base::_Base_manager<_Wrapper> _Base; 2131 2132 public: 2133 static bool 2134 _M_manager(_Any_data& __dest, const _Any_data& __source, 2135 _Manager_operation __op) 2136 { 2137 switch (__op) 2138 { 2139 #ifdef __GXX_RTTI 2140 case __get_type_info: 2141 __dest._M_access<const type_info*>() = &typeid(_Functor); 2142 break; 2143 #endif 2144 case __get_functor_ptr: 2145 __dest._M_access<_Functor*>() = 2146 &_Base::_M_get_pointer(__source)->__value; 2147 break; 2148 2149 default: 2150 _Base::_M_manager(__dest, __source, __op); 2151 } 2152 return false; 2153 } 2154 2155 static void 2156 _M_invoke(const _Any_data& __functor, _ArgTypes... __args) 2157 { 2158 std::mem_fn(_Base::_M_get_pointer(__functor)->__value)( 2159 std::forward<_ArgTypes>(__args)...); 2160 } 2161 }; 2162 2163 template<typename _From, typename _To> 2164 using __check_func_return_type 2165 = __or_<is_void<_To>, is_convertible<_From, _To>>; 2166 2167 /** 2168 * @brief Primary class template for std::function. 2169 * @ingroup functors 2170 * 2171 * Polymorphic function wrapper. 2172 */ 2173 template<typename _Res, typename... _ArgTypes> 2174 class function<_Res(_ArgTypes...)> 2175 : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>, 2176 private _Function_base 2177 { 2178 typedef _Res _Signature_type(_ArgTypes...); 2179 2180 template<typename _Functor> 2181 using _Invoke = decltype(__callable_functor(std::declval<_Functor&>()) 2182 (std::declval<_ArgTypes>()...) ); 2183 2184 template<typename _Functor> 2185 using _Callable = __check_func_return_type<_Invoke<_Functor>, _Res>; 2186 2187 template<typename _Cond, typename _Tp> 2188 using _Requires = typename enable_if<_Cond::value, _Tp>::type; 2189 2190 public: 2191 typedef _Res result_type; 2192 2193 // [3.7.2.1] construct/copy/destroy 2194 2195 /** 2196 * @brief Default construct creates an empty function call wrapper. 2197 * @post @c !(bool)*this 2198 */ 2199 function() noexcept 2200 : _Function_base() { } 2201 2202 /** 2203 * @brief Creates an empty function call wrapper. 2204 * @post @c !(bool)*this 2205 */ 2206 function(nullptr_t) noexcept 2207 : _Function_base() { } 2208 2209 /** 2210 * @brief %Function copy constructor. 2211 * @param __x A %function object with identical call signature. 2212 * @post @c bool(*this) == bool(__x) 2213 * 2214 * The newly-created %function contains a copy of the target of @a 2215 * __x (if it has one). 2216 */ 2217 function(const function& __x); 2218 2219 /** 2220 * @brief %Function move constructor. 2221 * @param __x A %function object rvalue with identical call signature. 2222 * 2223 * The newly-created %function contains the target of @a __x 2224 * (if it has one). 2225 */ 2226 function(function&& __x) : _Function_base() 2227 { 2228 __x.swap(*this); 2229 } 2230 2231 // TODO: needs allocator_arg_t 2232 2233 /** 2234 * @brief Builds a %function that targets a copy of the incoming 2235 * function object. 2236 * @param __f A %function object that is callable with parameters of 2237 * type @c T1, @c T2, ..., @c TN and returns a value convertible 2238 * to @c Res. 2239 * 2240 * The newly-created %function object will target a copy of 2241 * @a __f. If @a __f is @c reference_wrapper<F>, then this function 2242 * object will contain a reference to the function object @c 2243 * __f.get(). If @a __f is a NULL function pointer or NULL 2244 * pointer-to-member, the newly-created object will be empty. 2245 * 2246 * If @a __f is a non-NULL function pointer or an object of type @c 2247 * reference_wrapper<F>, this function will not throw. 2248 */ 2249 template<typename _Functor, 2250 typename = _Requires<_Callable<_Functor>, void>> 2251 function(_Functor); 2252 2253 /** 2254 * @brief %Function assignment operator. 2255 * @param __x A %function with identical call signature. 2256 * @post @c (bool)*this == (bool)x 2257 * @returns @c *this 2258 * 2259 * The target of @a __x is copied to @c *this. If @a __x has no 2260 * target, then @c *this will be empty. 2261 * 2262 * If @a __x targets a function pointer or a reference to a function 2263 * object, then this operation will not throw an %exception. 2264 */ 2265 function& 2266 operator=(const function& __x) 2267 { 2268 function(__x).swap(*this); 2269 return *this; 2270 } 2271 2272 /** 2273 * @brief %Function move-assignment operator. 2274 * @param __x A %function rvalue with identical call signature. 2275 * @returns @c *this 2276 * 2277 * The target of @a __x is moved to @c *this. If @a __x has no 2278 * target, then @c *this will be empty. 2279 * 2280 * If @a __x targets a function pointer or a reference to a function 2281 * object, then this operation will not throw an %exception. 2282 */ 2283 function& 2284 operator=(function&& __x) 2285 { 2286 function(std::move(__x)).swap(*this); 2287 return *this; 2288 } 2289 2290 /** 2291 * @brief %Function assignment to zero. 2292 * @post @c !(bool)*this 2293 * @returns @c *this 2294 * 2295 * The target of @c *this is deallocated, leaving it empty. 2296 */ 2297 function& 2298 operator=(nullptr_t) 2299 { 2300 if (_M_manager) 2301 { 2302 _M_manager(_M_functor, _M_functor, __destroy_functor); 2303 _M_manager = 0; 2304 _M_invoker = 0; 2305 } 2306 return *this; 2307 } 2308 2309 /** 2310 * @brief %Function assignment to a new target. 2311 * @param __f A %function object that is callable with parameters of 2312 * type @c T1, @c T2, ..., @c TN and returns a value convertible 2313 * to @c Res. 2314 * @return @c *this 2315 * 2316 * This %function object wrapper will target a copy of @a 2317 * __f. If @a __f is @c reference_wrapper<F>, then this function 2318 * object will contain a reference to the function object @c 2319 * __f.get(). If @a __f is a NULL function pointer or NULL 2320 * pointer-to-member, @c this object will be empty. 2321 * 2322 * If @a __f is a non-NULL function pointer or an object of type @c 2323 * reference_wrapper<F>, this function will not throw. 2324 */ 2325 template<typename _Functor> 2326 _Requires<_Callable<_Functor>, function&> 2327 operator=(_Functor&& __f) 2328 { 2329 function(std::forward<_Functor>(__f)).swap(*this); 2330 return *this; 2331 } 2332 2333 /// @overload 2334 template<typename _Functor> 2335 function& 2336 operator=(reference_wrapper<_Functor> __f) noexcept 2337 { 2338 function(__f).swap(*this); 2339 return *this; 2340 } 2341 2342 // [3.7.2.2] function modifiers 2343 2344 /** 2345 * @brief Swap the targets of two %function objects. 2346 * @param __x A %function with identical call signature. 2347 * 2348 * Swap the targets of @c this function object and @a __f. This 2349 * function will not throw an %exception. 2350 */ 2351 void swap(function& __x) 2352 { 2353 std::swap(_M_functor, __x._M_functor); 2354 std::swap(_M_manager, __x._M_manager); 2355 std::swap(_M_invoker, __x._M_invoker); 2356 } 2357 2358 // TODO: needs allocator_arg_t 2359 /* 2360 template<typename _Functor, typename _Alloc> 2361 void 2362 assign(_Functor&& __f, const _Alloc& __a) 2363 { 2364 function(allocator_arg, __a, 2365 std::forward<_Functor>(__f)).swap(*this); 2366 } 2367 */ 2368 2369 // [3.7.2.3] function capacity 2370 2371 /** 2372 * @brief Determine if the %function wrapper has a target. 2373 * 2374 * @return @c true when this %function object contains a target, 2375 * or @c false when it is empty. 2376 * 2377 * This function will not throw an %exception. 2378 */ 2379 explicit operator bool() const noexcept 2380 { return !_M_empty(); } 2381 2382 // [3.7.2.4] function invocation 2383 2384 /** 2385 * @brief Invokes the function targeted by @c *this. 2386 * @returns the result of the target. 2387 * @throws bad_function_call when @c !(bool)*this 2388 * 2389 * The function call operator invokes the target function object 2390 * stored by @c this. 2391 */ 2392 _Res operator()(_ArgTypes... __args) const; 2393 2394 #ifdef __GXX_RTTI 2395 // [3.7.2.5] function target access 2396 /** 2397 * @brief Determine the type of the target of this function object 2398 * wrapper. 2399 * 2400 * @returns the type identifier of the target function object, or 2401 * @c typeid(void) if @c !(bool)*this. 2402 * 2403 * This function will not throw an %exception. 2404 */ 2405 const type_info& target_type() const noexcept; 2406 2407 /** 2408 * @brief Access the stored target function object. 2409 * 2410 * @return Returns a pointer to the stored target function object, 2411 * if @c typeid(Functor).equals(target_type()); otherwise, a NULL 2412 * pointer. 2413 * 2414 * This function will not throw an %exception. 2415 */ 2416 template<typename _Functor> _Functor* target() noexcept; 2417 2418 /// @overload 2419 template<typename _Functor> const _Functor* target() const noexcept; 2420 #endif 2421 2422 private: 2423 typedef _Res (*_Invoker_type)(const _Any_data&, _ArgTypes...); 2424 _Invoker_type _M_invoker; 2425 }; 2426 2427 // Out-of-line member definitions. 2428 template<typename _Res, typename... _ArgTypes> 2429 function<_Res(_ArgTypes...)>:: 2430 function(const function& __x) 2431 : _Function_base() 2432 { 2433 if (static_cast<bool>(__x)) 2434 { 2435 _M_invoker = __x._M_invoker; 2436 _M_manager = __x._M_manager; 2437 __x._M_manager(_M_functor, __x._M_functor, __clone_functor); 2438 } 2439 } 2440 2441 template<typename _Res, typename... _ArgTypes> 2442 template<typename _Functor, typename> 2443 function<_Res(_ArgTypes...)>:: 2444 function(_Functor __f) 2445 : _Function_base() 2446 { 2447 typedef _Function_handler<_Signature_type, _Functor> _My_handler; 2448 2449 if (_My_handler::_M_not_empty_function(__f)) 2450 { 2451 _My_handler::_M_init_functor(_M_functor, std::move(__f)); 2452 _M_invoker = &_My_handler::_M_invoke; 2453 _M_manager = &_My_handler::_M_manager; 2454 } 2455 } 2456 2457 template<typename _Res, typename... _ArgTypes> 2458 _Res 2459 function<_Res(_ArgTypes...)>:: 2460 operator()(_ArgTypes... __args) const 2461 { 2462 if (_M_empty()) 2463 __throw_bad_function_call(); 2464 return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...); 2465 } 2466 2467 #ifdef __GXX_RTTI 2468 template<typename _Res, typename... _ArgTypes> 2469 const type_info& 2470 function<_Res(_ArgTypes...)>:: 2471 target_type() const noexcept 2472 { 2473 if (_M_manager) 2474 { 2475 _Any_data __typeinfo_result; 2476 _M_manager(__typeinfo_result, _M_functor, __get_type_info); 2477 return *__typeinfo_result._M_access<const type_info*>(); 2478 } 2479 else 2480 return typeid(void); 2481 } 2482 2483 template<typename _Res, typename... _ArgTypes> 2484 template<typename _Functor> 2485 _Functor* 2486 function<_Res(_ArgTypes...)>:: 2487 target() noexcept 2488 { 2489 if (typeid(_Functor) == target_type() && _M_manager) 2490 { 2491 _Any_data __ptr; 2492 if (_M_manager(__ptr, _M_functor, __get_functor_ptr) 2493 && !is_const<_Functor>::value) 2494 return 0; 2495 else 2496 return __ptr._M_access<_Functor*>(); 2497 } 2498 else 2499 return 0; 2500 } 2501 2502 template<typename _Res, typename... _ArgTypes> 2503 template<typename _Functor> 2504 const _Functor* 2505 function<_Res(_ArgTypes...)>:: 2506 target() const noexcept 2507 { 2508 if (typeid(_Functor) == target_type() && _M_manager) 2509 { 2510 _Any_data __ptr; 2511 _M_manager(__ptr, _M_functor, __get_functor_ptr); 2512 return __ptr._M_access<const _Functor*>(); 2513 } 2514 else 2515 return 0; 2516 } 2517 #endif 2518 2519 // [20.7.15.2.6] null pointer comparisons 2520 2521 /** 2522 * @brief Compares a polymorphic function object wrapper against 0 2523 * (the NULL pointer). 2524 * @returns @c true if the wrapper has no target, @c false otherwise 2525 * 2526 * This function will not throw an %exception. 2527 */ 2528 template<typename _Res, typename... _Args> 2529 inline bool 2530 operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept 2531 { return !static_cast<bool>(__f); } 2532 2533 /// @overload 2534 template<typename _Res, typename... _Args> 2535 inline bool 2536 operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept 2537 { return !static_cast<bool>(__f); } 2538 2539 /** 2540 * @brief Compares a polymorphic function object wrapper against 0 2541 * (the NULL pointer). 2542 * @returns @c false if the wrapper has no target, @c true otherwise 2543 * 2544 * This function will not throw an %exception. 2545 */ 2546 template<typename _Res, typename... _Args> 2547 inline bool 2548 operator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept 2549 { return static_cast<bool>(__f); } 2550 2551 /// @overload 2552 template<typename _Res, typename... _Args> 2553 inline bool 2554 operator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept 2555 { return static_cast<bool>(__f); } 2556 2557 // [20.7.15.2.7] specialized algorithms 2558 2559 /** 2560 * @brief Swap the targets of two polymorphic function object wrappers. 2561 * 2562 * This function will not throw an %exception. 2563 */ 2564 template<typename _Res, typename... _Args> 2565 inline void 2566 swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) 2567 { __x.swap(__y); } 2568 2569 _GLIBCXX_END_NAMESPACE_VERSION 2570 } // namespace std 2571 2572 #endif // C++11 2573 2574 #endif // _GLIBCXX_FUNCTIONAL 2575
