1// -*- C++ -*- 2//===----------------------------------------------------------------------===// 3// 4// The LLVM Compiler Infrastructure 5// 6// This file is dual licensed under the MIT and the University of Illinois Open 7// Source Licenses. See LICENSE.TXT for details. 8// 9//===----------------------------------------------------------------------===// 10 11#ifndef _LIBCPP_FUNCTIONAL_BASE 12#define _LIBCPP_FUNCTIONAL_BASE 13 14#include <__config> 15#include <type_traits> 16#include <typeinfo> 17#include <exception> 18#include <new> 19#include <utility> 20 21#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 22#pragma GCC system_header 23#endif 24 25_LIBCPP_BEGIN_NAMESPACE_STD 26 27template <class _Arg1, class _Arg2, class _Result> 28struct _LIBCPP_TEMPLATE_VIS binary_function 29{ 30 typedef _Arg1 first_argument_type; 31 typedef _Arg2 second_argument_type; 32 typedef _Result result_type; 33}; 34 35template <class _Tp> 36struct __has_result_type 37{ 38private: 39 struct __two {char __lx; char __lxx;}; 40 template <class _Up> static __two __test(...); 41 template <class _Up> static char __test(typename _Up::result_type* = 0); 42public: 43 static const bool value = sizeof(__test<_Tp>(0)) == 1; 44}; 45 46#if _LIBCPP_STD_VER > 11 47template <class _Tp = void> 48#else 49template <class _Tp> 50#endif 51struct _LIBCPP_TEMPLATE_VIS less : binary_function<_Tp, _Tp, bool> 52{ 53 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 54 bool operator()(const _Tp& __x, const _Tp& __y) const 55 {return __x < __y;} 56}; 57 58#if _LIBCPP_STD_VER > 11 59template <> 60struct _LIBCPP_TEMPLATE_VIS less<void> 61{ 62 template <class _T1, class _T2> 63 _LIBCPP_CONSTEXPR_AFTER_CXX11 _LIBCPP_INLINE_VISIBILITY 64 auto operator()(_T1&& __t, _T2&& __u) const 65 _NOEXCEPT_(noexcept(_VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u))) 66 -> decltype (_VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u)) 67 { return _VSTD::forward<_T1>(__t) < _VSTD::forward<_T2>(__u); } 68 typedef void is_transparent; 69}; 70#endif 71 72// __weak_result_type 73 74template <class _Tp> 75struct __derives_from_unary_function 76{ 77private: 78 struct __two {char __lx; char __lxx;}; 79 static __two __test(...); 80 template <class _Ap, class _Rp> 81 static unary_function<_Ap, _Rp> 82 __test(const volatile unary_function<_Ap, _Rp>*); 83public: 84 static const bool value = !is_same<decltype(__test((_Tp*)0)), __two>::value; 85 typedef decltype(__test((_Tp*)0)) type; 86}; 87 88template <class _Tp> 89struct __derives_from_binary_function 90{ 91private: 92 struct __two {char __lx; char __lxx;}; 93 static __two __test(...); 94 template <class _A1, class _A2, class _Rp> 95 static binary_function<_A1, _A2, _Rp> 96 __test(const volatile binary_function<_A1, _A2, _Rp>*); 97public: 98 static const bool value = !is_same<decltype(__test((_Tp*)0)), __two>::value; 99 typedef decltype(__test((_Tp*)0)) type; 100}; 101 102template <class _Tp, bool = __derives_from_unary_function<_Tp>::value> 103struct __maybe_derive_from_unary_function // bool is true 104 : public __derives_from_unary_function<_Tp>::type 105{ 106}; 107 108template <class _Tp> 109struct __maybe_derive_from_unary_function<_Tp, false> 110{ 111}; 112 113template <class _Tp, bool = __derives_from_binary_function<_Tp>::value> 114struct __maybe_derive_from_binary_function // bool is true 115 : public __derives_from_binary_function<_Tp>::type 116{ 117}; 118 119template <class _Tp> 120struct __maybe_derive_from_binary_function<_Tp, false> 121{ 122}; 123 124template <class _Tp, bool = __has_result_type<_Tp>::value> 125struct __weak_result_type_imp // bool is true 126 : public __maybe_derive_from_unary_function<_Tp>, 127 public __maybe_derive_from_binary_function<_Tp> 128{ 129 typedef typename _Tp::result_type result_type; 130}; 131 132template <class _Tp> 133struct __weak_result_type_imp<_Tp, false> 134 : public __maybe_derive_from_unary_function<_Tp>, 135 public __maybe_derive_from_binary_function<_Tp> 136{ 137}; 138 139template <class _Tp> 140struct __weak_result_type 141 : public __weak_result_type_imp<_Tp> 142{ 143}; 144 145// 0 argument case 146 147template <class _Rp> 148struct __weak_result_type<_Rp ()> 149{ 150 typedef _Rp result_type; 151}; 152 153template <class _Rp> 154struct __weak_result_type<_Rp (&)()> 155{ 156 typedef _Rp result_type; 157}; 158 159template <class _Rp> 160struct __weak_result_type<_Rp (*)()> 161{ 162 typedef _Rp result_type; 163}; 164 165// 1 argument case 166 167template <class _Rp, class _A1> 168struct __weak_result_type<_Rp (_A1)> 169 : public unary_function<_A1, _Rp> 170{ 171}; 172 173template <class _Rp, class _A1> 174struct __weak_result_type<_Rp (&)(_A1)> 175 : public unary_function<_A1, _Rp> 176{ 177}; 178 179template <class _Rp, class _A1> 180struct __weak_result_type<_Rp (*)(_A1)> 181 : public unary_function<_A1, _Rp> 182{ 183}; 184 185template <class _Rp, class _Cp> 186struct __weak_result_type<_Rp (_Cp::*)()> 187 : public unary_function<_Cp*, _Rp> 188{ 189}; 190 191template <class _Rp, class _Cp> 192struct __weak_result_type<_Rp (_Cp::*)() const> 193 : public unary_function<const _Cp*, _Rp> 194{ 195}; 196 197template <class _Rp, class _Cp> 198struct __weak_result_type<_Rp (_Cp::*)() volatile> 199 : public unary_function<volatile _Cp*, _Rp> 200{ 201}; 202 203template <class _Rp, class _Cp> 204struct __weak_result_type<_Rp (_Cp::*)() const volatile> 205 : public unary_function<const volatile _Cp*, _Rp> 206{ 207}; 208 209// 2 argument case 210 211template <class _Rp, class _A1, class _A2> 212struct __weak_result_type<_Rp (_A1, _A2)> 213 : public binary_function<_A1, _A2, _Rp> 214{ 215}; 216 217template <class _Rp, class _A1, class _A2> 218struct __weak_result_type<_Rp (*)(_A1, _A2)> 219 : public binary_function<_A1, _A2, _Rp> 220{ 221}; 222 223template <class _Rp, class _A1, class _A2> 224struct __weak_result_type<_Rp (&)(_A1, _A2)> 225 : public binary_function<_A1, _A2, _Rp> 226{ 227}; 228 229template <class _Rp, class _Cp, class _A1> 230struct __weak_result_type<_Rp (_Cp::*)(_A1)> 231 : public binary_function<_Cp*, _A1, _Rp> 232{ 233}; 234 235template <class _Rp, class _Cp, class _A1> 236struct __weak_result_type<_Rp (_Cp::*)(_A1) const> 237 : public binary_function<const _Cp*, _A1, _Rp> 238{ 239}; 240 241template <class _Rp, class _Cp, class _A1> 242struct __weak_result_type<_Rp (_Cp::*)(_A1) volatile> 243 : public binary_function<volatile _Cp*, _A1, _Rp> 244{ 245}; 246 247template <class _Rp, class _Cp, class _A1> 248struct __weak_result_type<_Rp (_Cp::*)(_A1) const volatile> 249 : public binary_function<const volatile _Cp*, _A1, _Rp> 250{ 251}; 252 253 254#ifndef _LIBCPP_CXX03_LANG 255// 3 or more arguments 256 257template <class _Rp, class _A1, class _A2, class _A3, class ..._A4> 258struct __weak_result_type<_Rp (_A1, _A2, _A3, _A4...)> 259{ 260 typedef _Rp result_type; 261}; 262 263template <class _Rp, class _A1, class _A2, class _A3, class ..._A4> 264struct __weak_result_type<_Rp (&)(_A1, _A2, _A3, _A4...)> 265{ 266 typedef _Rp result_type; 267}; 268 269template <class _Rp, class _A1, class _A2, class _A3, class ..._A4> 270struct __weak_result_type<_Rp (*)(_A1, _A2, _A3, _A4...)> 271{ 272 typedef _Rp result_type; 273}; 274 275template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 276struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...)> 277{ 278 typedef _Rp result_type; 279}; 280 281template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 282struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const> 283{ 284 typedef _Rp result_type; 285}; 286 287template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 288struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) volatile> 289{ 290 typedef _Rp result_type; 291}; 292 293template <class _Rp, class _Cp, class _A1, class _A2, class ..._A3> 294struct __weak_result_type<_Rp (_Cp::*)(_A1, _A2, _A3...) const volatile> 295{ 296 typedef _Rp result_type; 297}; 298 299template <class _Tp, class ..._Args> 300struct __invoke_return 301{ 302 typedef decltype(__invoke(_VSTD::declval<_Tp>(), _VSTD::declval<_Args>()...)) type; 303}; 304 305#else // defined(_LIBCPP_CXX03_LANG) 306 307#include <__functional_base_03> 308 309#endif // !defined(_LIBCPP_CXX03_LANG) 310 311 312template <class _Ret> 313struct __invoke_void_return_wrapper 314{ 315#ifndef _LIBCPP_CXX03_LANG 316 template <class ..._Args> 317 static _Ret __call(_Args&&... __args) { 318 return __invoke(_VSTD::forward<_Args>(__args)...); 319 } 320#else 321 template <class _Fn> 322 static _Ret __call(_Fn __f) { 323 return __invoke(__f); 324 } 325 326 template <class _Fn, class _A0> 327 static _Ret __call(_Fn __f, _A0& __a0) { 328 return __invoke(__f, __a0); 329 } 330 331 template <class _Fn, class _A0, class _A1> 332 static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1) { 333 return __invoke(__f, __a0, __a1); 334 } 335 336 template <class _Fn, class _A0, class _A1, class _A2> 337 static _Ret __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2){ 338 return __invoke(__f, __a0, __a1, __a2); 339 } 340#endif 341}; 342 343template <> 344struct __invoke_void_return_wrapper<void> 345{ 346#ifndef _LIBCPP_CXX03_LANG 347 template <class ..._Args> 348 static void __call(_Args&&... __args) { 349 __invoke(_VSTD::forward<_Args>(__args)...); 350 } 351#else 352 template <class _Fn> 353 static void __call(_Fn __f) { 354 __invoke(__f); 355 } 356 357 template <class _Fn, class _A0> 358 static void __call(_Fn __f, _A0& __a0) { 359 __invoke(__f, __a0); 360 } 361 362 template <class _Fn, class _A0, class _A1> 363 static void __call(_Fn __f, _A0& __a0, _A1& __a1) { 364 __invoke(__f, __a0, __a1); 365 } 366 367 template <class _Fn, class _A0, class _A1, class _A2> 368 static void __call(_Fn __f, _A0& __a0, _A1& __a1, _A2& __a2) { 369 __invoke(__f, __a0, __a1, __a2); 370 } 371#endif 372}; 373 374template <class _Tp> 375class _LIBCPP_TEMPLATE_VIS reference_wrapper 376 : public __weak_result_type<_Tp> 377{ 378public: 379 // types 380 typedef _Tp type; 381private: 382 type* __f_; 383 384public: 385 // construct/copy/destroy 386 _LIBCPP_INLINE_VISIBILITY reference_wrapper(type& __f) _NOEXCEPT 387 : __f_(_VSTD::addressof(__f)) {} 388#ifndef _LIBCPP_CXX03_LANG 389 private: reference_wrapper(type&&); public: // = delete; // do not bind to temps 390#endif 391 392 // access 393 _LIBCPP_INLINE_VISIBILITY operator type& () const _NOEXCEPT {return *__f_;} 394 _LIBCPP_INLINE_VISIBILITY type& get() const _NOEXCEPT {return *__f_;} 395 396#ifndef _LIBCPP_CXX03_LANG 397 // invoke 398 template <class... _ArgTypes> 399 _LIBCPP_INLINE_VISIBILITY 400 typename __invoke_of<type&, _ArgTypes...>::type 401 operator() (_ArgTypes&&... __args) const { 402 return __invoke(get(), _VSTD::forward<_ArgTypes>(__args)...); 403 } 404#else 405 406 _LIBCPP_INLINE_VISIBILITY 407 typename __invoke_return<type>::type 408 operator() () const { 409 return __invoke(get()); 410 } 411 412 template <class _A0> 413 _LIBCPP_INLINE_VISIBILITY 414 typename __invoke_return0<type, _A0>::type 415 operator() (_A0& __a0) const { 416 return __invoke(get(), __a0); 417 } 418 419 template <class _A0> 420 _LIBCPP_INLINE_VISIBILITY 421 typename __invoke_return0<type, _A0 const>::type 422 operator() (_A0 const& __a0) const { 423 return __invoke(get(), __a0); 424 } 425 426 template <class _A0, class _A1> 427 _LIBCPP_INLINE_VISIBILITY 428 typename __invoke_return1<type, _A0, _A1>::type 429 operator() (_A0& __a0, _A1& __a1) const { 430 return __invoke(get(), __a0, __a1); 431 } 432 433 template <class _A0, class _A1> 434 _LIBCPP_INLINE_VISIBILITY 435 typename __invoke_return1<type, _A0 const, _A1>::type 436 operator() (_A0 const& __a0, _A1& __a1) const { 437 return __invoke(get(), __a0, __a1); 438 } 439 440 template <class _A0, class _A1> 441 _LIBCPP_INLINE_VISIBILITY 442 typename __invoke_return1<type, _A0, _A1 const>::type 443 operator() (_A0& __a0, _A1 const& __a1) const { 444 return __invoke(get(), __a0, __a1); 445 } 446 447 template <class _A0, class _A1> 448 _LIBCPP_INLINE_VISIBILITY 449 typename __invoke_return1<type, _A0 const, _A1 const>::type 450 operator() (_A0 const& __a0, _A1 const& __a1) const { 451 return __invoke(get(), __a0, __a1); 452 } 453 454 template <class _A0, class _A1, class _A2> 455 _LIBCPP_INLINE_VISIBILITY 456 typename __invoke_return2<type, _A0, _A1, _A2>::type 457 operator() (_A0& __a0, _A1& __a1, _A2& __a2) const { 458 return __invoke(get(), __a0, __a1, __a2); 459 } 460 461 template <class _A0, class _A1, class _A2> 462 _LIBCPP_INLINE_VISIBILITY 463 typename __invoke_return2<type, _A0 const, _A1, _A2>::type 464 operator() (_A0 const& __a0, _A1& __a1, _A2& __a2) const { 465 return __invoke(get(), __a0, __a1, __a2); 466 } 467 468 template <class _A0, class _A1, class _A2> 469 _LIBCPP_INLINE_VISIBILITY 470 typename __invoke_return2<type, _A0, _A1 const, _A2>::type 471 operator() (_A0& __a0, _A1 const& __a1, _A2& __a2) const { 472 return __invoke(get(), __a0, __a1, __a2); 473 } 474 475 template <class _A0, class _A1, class _A2> 476 _LIBCPP_INLINE_VISIBILITY 477 typename __invoke_return2<type, _A0, _A1, _A2 const>::type 478 operator() (_A0& __a0, _A1& __a1, _A2 const& __a2) const { 479 return __invoke(get(), __a0, __a1, __a2); 480 } 481 482 template <class _A0, class _A1, class _A2> 483 _LIBCPP_INLINE_VISIBILITY 484 typename __invoke_return2<type, _A0 const, _A1 const, _A2>::type 485 operator() (_A0 const& __a0, _A1 const& __a1, _A2& __a2) const { 486 return __invoke(get(), __a0, __a1, __a2); 487 } 488 489 template <class _A0, class _A1, class _A2> 490 _LIBCPP_INLINE_VISIBILITY 491 typename __invoke_return2<type, _A0 const, _A1, _A2 const>::type 492 operator() (_A0 const& __a0, _A1& __a1, _A2 const& __a2) const { 493 return __invoke(get(), __a0, __a1, __a2); 494 } 495 496 template <class _A0, class _A1, class _A2> 497 _LIBCPP_INLINE_VISIBILITY 498 typename __invoke_return2<type, _A0, _A1 const, _A2 const>::type 499 operator() (_A0& __a0, _A1 const& __a1, _A2 const& __a2) const { 500 return __invoke(get(), __a0, __a1, __a2); 501 } 502 503 template <class _A0, class _A1, class _A2> 504 _LIBCPP_INLINE_VISIBILITY 505 typename __invoke_return2<type, _A0 const, _A1 const, _A2 const>::type 506 operator() (_A0 const& __a0, _A1 const& __a1, _A2 const& __a2) const { 507 return __invoke(get(), __a0, __a1, __a2); 508 } 509#endif // _LIBCPP_CXX03_LANG 510}; 511 512 513template <class _Tp> 514inline _LIBCPP_INLINE_VISIBILITY 515reference_wrapper<_Tp> 516ref(_Tp& __t) _NOEXCEPT 517{ 518 return reference_wrapper<_Tp>(__t); 519} 520 521template <class _Tp> 522inline _LIBCPP_INLINE_VISIBILITY 523reference_wrapper<_Tp> 524ref(reference_wrapper<_Tp> __t) _NOEXCEPT 525{ 526 return ref(__t.get()); 527} 528 529template <class _Tp> 530inline _LIBCPP_INLINE_VISIBILITY 531reference_wrapper<const _Tp> 532cref(const _Tp& __t) _NOEXCEPT 533{ 534 return reference_wrapper<const _Tp>(__t); 535} 536 537template <class _Tp> 538inline _LIBCPP_INLINE_VISIBILITY 539reference_wrapper<const _Tp> 540cref(reference_wrapper<_Tp> __t) _NOEXCEPT 541{ 542 return cref(__t.get()); 543} 544 545#ifndef _LIBCPP_CXX03_LANG 546template <class _Tp> void ref(const _Tp&&) = delete; 547template <class _Tp> void cref(const _Tp&&) = delete; 548#endif 549 550#if _LIBCPP_STD_VER > 11 551template <class _Tp, class, class = void> 552struct __is_transparent : false_type {}; 553 554template <class _Tp, class _Up> 555struct __is_transparent<_Tp, _Up, 556 typename __void_t<typename _Tp::is_transparent>::type> 557 : true_type {}; 558#endif 559 560// allocator_arg_t 561 562struct _LIBCPP_TEMPLATE_VIS allocator_arg_t { }; 563 564#if defined(_LIBCPP_CXX03_LANG) || defined(_LIBCPP_BUILDING_LIBRARY) 565extern _LIBCPP_EXPORTED_FROM_ABI const allocator_arg_t allocator_arg; 566#else 567/* _LIBCPP_INLINE_VAR */ constexpr allocator_arg_t allocator_arg = allocator_arg_t(); 568#endif 569 570// uses_allocator 571 572template <class _Tp> 573struct __has_allocator_type 574{ 575private: 576 struct __two {char __lx; char __lxx;}; 577 template <class _Up> static __two __test(...); 578 template <class _Up> static char __test(typename _Up::allocator_type* = 0); 579public: 580 static const bool value = sizeof(__test<_Tp>(0)) == 1; 581}; 582 583template <class _Tp, class _Alloc, bool = __has_allocator_type<_Tp>::value> 584struct __uses_allocator 585 : public integral_constant<bool, 586 is_convertible<_Alloc, typename _Tp::allocator_type>::value> 587{ 588}; 589 590template <class _Tp, class _Alloc> 591struct __uses_allocator<_Tp, _Alloc, false> 592 : public false_type 593{ 594}; 595 596template <class _Tp, class _Alloc> 597struct _LIBCPP_TEMPLATE_VIS uses_allocator 598 : public __uses_allocator<_Tp, _Alloc> 599{ 600}; 601 602#if _LIBCPP_STD_VER > 14 603template <class _Tp, class _Alloc> 604_LIBCPP_INLINE_VAR constexpr size_t uses_allocator_v = uses_allocator<_Tp, _Alloc>::value; 605#endif 606 607#ifndef _LIBCPP_CXX03_LANG 608 609// allocator construction 610 611template <class _Tp, class _Alloc, class ..._Args> 612struct __uses_alloc_ctor_imp 613{ 614 typedef typename __uncvref<_Alloc>::type _RawAlloc; 615 static const bool __ua = uses_allocator<_Tp, _RawAlloc>::value; 616 static const bool __ic = 617 is_constructible<_Tp, allocator_arg_t, _Alloc, _Args...>::value; 618 static const int value = __ua ? 2 - __ic : 0; 619}; 620 621template <class _Tp, class _Alloc, class ..._Args> 622struct __uses_alloc_ctor 623 : integral_constant<int, __uses_alloc_ctor_imp<_Tp, _Alloc, _Args...>::value> 624 {}; 625 626template <class _Tp, class _Allocator, class... _Args> 627inline _LIBCPP_INLINE_VISIBILITY 628void __user_alloc_construct_impl (integral_constant<int, 0>, _Tp *__storage, const _Allocator &, _Args &&... __args ) 629{ 630 new (__storage) _Tp (_VSTD::forward<_Args>(__args)...); 631} 632 633// FIXME: This should have a version which takes a non-const alloc. 634template <class _Tp, class _Allocator, class... _Args> 635inline _LIBCPP_INLINE_VISIBILITY 636void __user_alloc_construct_impl (integral_constant<int, 1>, _Tp *__storage, const _Allocator &__a, _Args &&... __args ) 637{ 638 new (__storage) _Tp (allocator_arg, __a, _VSTD::forward<_Args>(__args)...); 639} 640 641// FIXME: This should have a version which takes a non-const alloc. 642template <class _Tp, class _Allocator, class... _Args> 643inline _LIBCPP_INLINE_VISIBILITY 644void __user_alloc_construct_impl (integral_constant<int, 2>, _Tp *__storage, const _Allocator &__a, _Args &&... __args ) 645{ 646 new (__storage) _Tp (_VSTD::forward<_Args>(__args)..., __a); 647} 648 649#endif // _LIBCPP_CXX03_LANG 650 651_LIBCPP_END_NAMESPACE_STD 652 653#endif // _LIBCPP_FUNCTIONAL_BASE 654