// <functional> -*- C++ -*- // Copyright (C) 2001-2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * Copyright (c) 1997 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * */ /** @file include/functional * This is a Standard C++ Library header. */ #ifndef _GLIBCXX_FUNCTIONAL #define _GLIBCXX_FUNCTIONAL 1 #pragma GCC system_header #include <bits/c++config.h> #include <bits/stl_function.h> #if __cplusplus >= 201103L #include <new> #include <tuple> #include <type_traits> #include <bits/functional_hash.h> #include <bits/invoke.h> #include <bits/refwrap.h> // std::reference_wrapper and _Mem_fn_traits #include <bits/std_function.h> // std::function #if __cplusplus > 201402L # include <unordered_map> # include <vector> # include <array> # include <utility> # include <bits/stl_algo.h> #endif #if __cplusplus > 201703L # include <bits/range_cmp.h> # include <compare> #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #if __cplusplus >= 201703L # define __cpp_lib_invoke 201411L # if __cplusplus > 201703L # define __cpp_lib_constexpr_functional 201907L # endif /// Invoke a callable object. template<typename _Callable, typename... _Args> inline _GLIBCXX20_CONSTEXPR invoke_result_t<_Callable, _Args...> invoke(_Callable&& __fn, _Args&&... __args) noexcept(is_nothrow_invocable_v<_Callable, _Args...>) { return std::__invoke(std::forward<_Callable>(__fn), std::forward<_Args>(__args)...); } #endif // C++17 template<typename _MemFunPtr, bool __is_mem_fn = is_member_function_pointer<_MemFunPtr>::value> class _Mem_fn_base : public _Mem_fn_traits<_MemFunPtr>::__maybe_type { using _Traits = _Mem_fn_traits<_MemFunPtr>; using _Arity = typename _Traits::__arity; using _Varargs = typename _Traits::__vararg; template<typename _Func, typename... _BoundArgs> friend struct _Bind_check_arity; _MemFunPtr _M_pmf; public: using result_type = typename _Traits::__result_type; explicit constexpr _Mem_fn_base(_MemFunPtr __pmf) noexcept : _M_pmf(__pmf) { } template<typename... _Args> _GLIBCXX20_CONSTEXPR auto operator()(_Args&&... __args) const noexcept(noexcept( std::__invoke(_M_pmf, std::forward<_Args>(__args)...))) -> decltype(std::__invoke(_M_pmf, std::forward<_Args>(__args)...)) { return std::__invoke(_M_pmf, std::forward<_Args>(__args)...); } }; // Partial specialization for member object pointers. template<typename _MemObjPtr> class _Mem_fn_base<_MemObjPtr, false> { using _Arity = integral_constant<size_t, 0>; using _Varargs = false_type; template<typename _Func, typename... _BoundArgs> friend struct _Bind_check_arity; _MemObjPtr _M_pm; public: explicit constexpr _Mem_fn_base(_MemObjPtr __pm) noexcept : _M_pm(__pm) { } template<typename _Tp> _GLIBCXX20_CONSTEXPR auto operator()(_Tp&& __obj) const noexcept(noexcept(std::__invoke(_M_pm, std::forward<_Tp>(__obj)))) -> decltype(std::__invoke(_M_pm, std::forward<_Tp>(__obj))) { return std::__invoke(_M_pm, std::forward<_Tp>(__obj)); } }; template<typename _MemberPointer> struct _Mem_fn; // undefined template<typename _Res, typename _Class> struct _Mem_fn<_Res _Class::*> : _Mem_fn_base<_Res _Class::*> { using _Mem_fn_base<_Res _Class::*>::_Mem_fn_base; }; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2048. Unnecessary mem_fn overloads /** * @brief Returns a function object that forwards to the member * pointer @a pm. * @ingroup functors */ template<typename _Tp, typename _Class> _GLIBCXX20_CONSTEXPR inline _Mem_fn<_Tp _Class::*> mem_fn(_Tp _Class::* __pm) noexcept { return _Mem_fn<_Tp _Class::*>(__pm); } /** * @brief Determines if the given type _Tp is a function object that * should be treated as a subexpression when evaluating calls to * function objects returned by bind(). * * C++11 [func.bind.isbind]. * @ingroup binders */ template<typename _Tp> struct is_bind_expression : public false_type { }; /** * @brief Determines if the given type _Tp is a placeholder in a * bind() expression and, if so, which placeholder it is. * * C++11 [func.bind.isplace]. * @ingroup binders */ template<typename _Tp> struct is_placeholder : public integral_constant<int, 0> { }; #if __cplusplus > 201402L template <typename _Tp> inline constexpr bool is_bind_expression_v = is_bind_expression<_Tp>::value; template <typename _Tp> inline constexpr int is_placeholder_v = is_placeholder<_Tp>::value; #endif // C++17 /** @brief The type of placeholder objects defined by libstdc++. * @ingroup binders */ template<int _Num> struct _Placeholder { }; /** @namespace std::placeholders * @brief ISO C++ 2011 namespace for std::bind placeholders. * @ingroup binders */ namespace placeholders { /* Define a large number of placeholders. There is no way to * simplify this with variadic templates, because we're introducing * unique names for each. */ extern const _Placeholder<1> _1; extern const _Placeholder<2> _2; extern const _Placeholder<3> _3; extern const _Placeholder<4> _4; extern const _Placeholder<5> _5; extern const _Placeholder<6> _6; extern const _Placeholder<7> _7; extern const _Placeholder<8> _8; extern const _Placeholder<9> _9; extern const _Placeholder<10> _10; extern const _Placeholder<11> _11; extern const _Placeholder<12> _12; extern const _Placeholder<13> _13; extern const _Placeholder<14> _14; extern const _Placeholder<15> _15; extern const _Placeholder<16> _16; extern const _Placeholder<17> _17; extern const _Placeholder<18> _18; extern const _Placeholder<19> _19; extern const _Placeholder<20> _20; extern const _Placeholder<21> _21; extern const _Placeholder<22> _22; extern const _Placeholder<23> _23; extern const _Placeholder<24> _24; extern const _Placeholder<25> _25; extern const _Placeholder<26> _26; extern const _Placeholder<27> _27; extern const _Placeholder<28> _28; extern const _Placeholder<29> _29; } /** * Partial specialization of is_placeholder that provides the placeholder * number for the placeholder objects defined by libstdc++. * @ingroup binders */ template<int _Num> struct is_placeholder<_Placeholder<_Num> > : public integral_constant<int, _Num> { }; template<int _Num> struct is_placeholder<const _Placeholder<_Num> > : public integral_constant<int, _Num> { }; // Like tuple_element_t but SFINAE-friendly. template<std::size_t __i, typename _Tuple> using _Safe_tuple_element_t = typename enable_if<(__i < tuple_size<_Tuple>::value), tuple_element<__i, _Tuple>>::type::type; /** * Maps an argument to bind() into an actual argument to the bound * function object [func.bind.bind]/10. Only the first parameter should * be specified: the rest are used to determine among the various * implementations. Note that, although this class is a function * object, it isn't entirely normal because it takes only two * parameters regardless of the number of parameters passed to the * bind expression. The first parameter is the bound argument and * the second parameter is a tuple containing references to the * rest of the arguments. */ template<typename _Arg, bool _IsBindExp = is_bind_expression<_Arg>::value, bool _IsPlaceholder = (is_placeholder<_Arg>::value > 0)> class _Mu; /** * If the argument is reference_wrapper<_Tp>, returns the * underlying reference. * C++11 [func.bind.bind] p10 bullet 1. */ template<typename _Tp> class _Mu<reference_wrapper<_Tp>, false, false> { public: /* Note: This won't actually work for const volatile * reference_wrappers, because reference_wrapper::get() is const * but not volatile-qualified. This might be a defect in the TR. */ template<typename _CVRef, typename _Tuple> _GLIBCXX20_CONSTEXPR _Tp& operator()(_CVRef& __arg, _Tuple&) const volatile { return __arg.get(); } }; /** * If the argument is a bind expression, we invoke the underlying * function object with the same cv-qualifiers as we are given and * pass along all of our arguments (unwrapped). * C++11 [func.bind.bind] p10 bullet 2. */ template<typename _Arg> class _Mu<_Arg, true, false> { public: template<typename _CVArg, typename... _Args> _GLIBCXX20_CONSTEXPR auto operator()(_CVArg& __arg, tuple<_Args...>& __tuple) const volatile -> decltype(__arg(declval<_Args>()...)) { // Construct an index tuple and forward to __call typedef typename _Build_index_tuple<sizeof...(_Args)>::__type _Indexes; return this->__call(__arg, __tuple, _Indexes()); } private: // Invokes the underlying function object __arg by unpacking all // of the arguments in the tuple. template<typename _CVArg, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR auto __call(_CVArg& __arg, tuple<_Args...>& __tuple, const _Index_tuple<_Indexes...>&) const volatile -> decltype(__arg(declval<_Args>()...)) { return __arg(std::get<_Indexes>(std::move(__tuple))...); } }; /** * If the argument is a placeholder for the Nth argument, returns * a reference to the Nth argument to the bind function object. * C++11 [func.bind.bind] p10 bullet 3. */ template<typename _Arg> class _Mu<_Arg, false, true> { public: template<typename _Tuple> _GLIBCXX20_CONSTEXPR _Safe_tuple_element_t<(is_placeholder<_Arg>::value - 1), _Tuple>&& operator()(const volatile _Arg&, _Tuple& __tuple) const volatile { return ::std::get<(is_placeholder<_Arg>::value - 1)>(std::move(__tuple)); } }; /** * If the argument is just a value, returns a reference to that * value. The cv-qualifiers on the reference are determined by the caller. * C++11 [func.bind.bind] p10 bullet 4. */ template<typename _Arg> class _Mu<_Arg, false, false> { public: template<typename _CVArg, typename _Tuple> _GLIBCXX20_CONSTEXPR _CVArg&& operator()(_CVArg&& __arg, _Tuple&) const volatile { return std::forward<_CVArg>(__arg); } }; // std::get<I> for volatile-qualified tuples template<std::size_t _Ind, typename... _Tp> inline auto __volget(volatile tuple<_Tp...>& __tuple) -> __tuple_element_t<_Ind, tuple<_Tp...>> volatile& { return std::get<_Ind>(const_cast<tuple<_Tp...>&>(__tuple)); } // std::get<I> for const-volatile-qualified tuples template<std::size_t _Ind, typename... _Tp> inline auto __volget(const volatile tuple<_Tp...>& __tuple) -> __tuple_element_t<_Ind, tuple<_Tp...>> const volatile& { return std::get<_Ind>(const_cast<const tuple<_Tp...>&>(__tuple)); } /// Type of the function object returned from bind(). template<typename _Signature> struct _Bind; template<typename _Functor, typename... _Bound_args> class _Bind<_Functor(_Bound_args...)> : public _Weak_result_type<_Functor> { typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type _Bound_indexes; _Functor _M_f; tuple<_Bound_args...> _M_bound_args; // Call unqualified template<typename _Result, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR _Result __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) { return std::__invoke(_M_f, _Mu<_Bound_args>()(std::get<_Indexes>(_M_bound_args), __args)... ); } // Call as const template<typename _Result, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR _Result __call_c(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const { return std::__invoke(_M_f, _Mu<_Bound_args>()(std::get<_Indexes>(_M_bound_args), __args)... ); } // Call as volatile template<typename _Result, typename... _Args, std::size_t... _Indexes> _Result __call_v(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) volatile { return std::__invoke(_M_f, _Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)... ); } // Call as const volatile template<typename _Result, typename... _Args, std::size_t... _Indexes> _Result __call_c_v(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const volatile { return std::__invoke(_M_f, _Mu<_Bound_args>()(__volget<_Indexes>(_M_bound_args), __args)... ); } template<typename _BoundArg, typename _CallArgs> using _Mu_type = decltype( _Mu<typename remove_cv<_BoundArg>::type>()( std::declval<_BoundArg&>(), std::declval<_CallArgs&>()) ); template<typename _Fn, typename _CallArgs, typename... _BArgs> using _Res_type_impl = typename result_of< _Fn&(_Mu_type<_BArgs, _CallArgs>&&...) >::type; template<typename _CallArgs> using _Res_type = _Res_type_impl<_Functor, _CallArgs, _Bound_args...>; template<typename _CallArgs> using __dependent = typename enable_if<bool(tuple_size<_CallArgs>::value+1), _Functor>::type; template<typename _CallArgs, template<class> class __cv_quals> using _Res_type_cv = _Res_type_impl< typename __cv_quals<__dependent<_CallArgs>>::type, _CallArgs, typename __cv_quals<_Bound_args>::type...>; public: template<typename... _Args> explicit _GLIBCXX20_CONSTEXPR _Bind(const _Functor& __f, _Args&&... __args) : _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...) { } template<typename... _Args> explicit _GLIBCXX20_CONSTEXPR _Bind(_Functor&& __f, _Args&&... __args) : _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...) { } _Bind(const _Bind&) = default; _Bind(_Bind&&) = default; // Call unqualified template<typename... _Args, typename _Result = _Res_type<tuple<_Args...>>> _GLIBCXX20_CONSTEXPR _Result operator()(_Args&&... __args) { return this->__call<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } // Call as const template<typename... _Args, typename _Result = _Res_type_cv<tuple<_Args...>, add_const>> _GLIBCXX20_CONSTEXPR _Result operator()(_Args&&... __args) const { return this->__call_c<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } #if __cplusplus > 201402L # define _GLIBCXX_DEPR_BIND \ [[deprecated("std::bind does not support volatile in C++17")]] #else # define _GLIBCXX_DEPR_BIND #endif // Call as volatile template<typename... _Args, typename _Result = _Res_type_cv<tuple<_Args...>, add_volatile>> _GLIBCXX_DEPR_BIND _Result operator()(_Args&&... __args) volatile { return this->__call_v<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } // Call as const volatile template<typename... _Args, typename _Result = _Res_type_cv<tuple<_Args...>, add_cv>> _GLIBCXX_DEPR_BIND _Result operator()(_Args&&... __args) const volatile { return this->__call_c_v<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } }; /// Type of the function object returned from bind<R>(). template<typename _Result, typename _Signature> struct _Bind_result; template<typename _Result, typename _Functor, typename... _Bound_args> class _Bind_result<_Result, _Functor(_Bound_args...)> { typedef typename _Build_index_tuple<sizeof...(_Bound_args)>::__type _Bound_indexes; _Functor _M_f; tuple<_Bound_args...> _M_bound_args; // Call unqualified template<typename _Res, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR _Res __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) { return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>() (std::get<_Indexes>(_M_bound_args), __args)...); } // Call as const template<typename _Res, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR _Res __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const { return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>() (std::get<_Indexes>(_M_bound_args), __args)...); } // Call as volatile template<typename _Res, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR _Res __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) volatile { return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>() (__volget<_Indexes>(_M_bound_args), __args)...); } // Call as const volatile template<typename _Res, typename... _Args, std::size_t... _Indexes> _GLIBCXX20_CONSTEXPR _Res __call(tuple<_Args...>&& __args, _Index_tuple<_Indexes...>) const volatile { return std::__invoke_r<_Res>(_M_f, _Mu<_Bound_args>() (__volget<_Indexes>(_M_bound_args), __args)...); } public: typedef _Result result_type; template<typename... _Args> explicit _GLIBCXX20_CONSTEXPR _Bind_result(const _Functor& __f, _Args&&... __args) : _M_f(__f), _M_bound_args(std::forward<_Args>(__args)...) { } template<typename... _Args> explicit _GLIBCXX20_CONSTEXPR _Bind_result(_Functor&& __f, _Args&&... __args) : _M_f(std::move(__f)), _M_bound_args(std::forward<_Args>(__args)...) { } _Bind_result(const _Bind_result&) = default; _Bind_result(_Bind_result&&) = default; // Call unqualified template<typename... _Args> _GLIBCXX20_CONSTEXPR result_type operator()(_Args&&... __args) { return this->__call<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } // Call as const template<typename... _Args> _GLIBCXX20_CONSTEXPR result_type operator()(_Args&&... __args) const { return this->__call<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } // Call as volatile template<typename... _Args> _GLIBCXX_DEPR_BIND result_type operator()(_Args&&... __args) volatile { return this->__call<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } // Call as const volatile template<typename... _Args> _GLIBCXX_DEPR_BIND result_type operator()(_Args&&... __args) const volatile { return this->__call<_Result>( std::forward_as_tuple(std::forward<_Args>(__args)...), _Bound_indexes()); } }; #undef _GLIBCXX_DEPR_BIND /** * @brief Class template _Bind is always a bind expression. * @ingroup binders */ template<typename _Signature> struct is_bind_expression<_Bind<_Signature> > : public true_type { }; /** * @brief Class template _Bind is always a bind expression. * @ingroup binders */ template<typename _Signature> struct is_bind_expression<const _Bind<_Signature> > : public true_type { }; /** * @brief Class template _Bind is always a bind expression. * @ingroup binders */ template<typename _Signature> struct is_bind_expression<volatile _Bind<_Signature> > : public true_type { }; /** * @brief Class template _Bind is always a bind expression. * @ingroup binders */ template<typename _Signature> struct is_bind_expression<const volatile _Bind<_Signature>> : public true_type { }; /** * @brief Class template _Bind_result is always a bind expression. * @ingroup binders */ template<typename _Result, typename _Signature> struct is_bind_expression<_Bind_result<_Result, _Signature>> : public true_type { }; /** * @brief Class template _Bind_result is always a bind expression. * @ingroup binders */ template<typename _Result, typename _Signature> struct is_bind_expression<const _Bind_result<_Result, _Signature>> : public true_type { }; /** * @brief Class template _Bind_result is always a bind expression. * @ingroup binders */ template<typename _Result, typename _Signature> struct is_bind_expression<volatile _Bind_result<_Result, _Signature>> : public true_type { }; /** * @brief Class template _Bind_result is always a bind expression. * @ingroup binders */ template<typename _Result, typename _Signature> struct is_bind_expression<const volatile _Bind_result<_Result, _Signature>> : public true_type { }; template<typename _Func, typename... _BoundArgs> struct _Bind_check_arity { }; template<typename _Ret, typename... _Args, typename... _BoundArgs> struct _Bind_check_arity<_Ret (*)(_Args...), _BoundArgs...> { static_assert(sizeof...(_BoundArgs) == sizeof...(_Args), "Wrong number of arguments for function"); }; template<typename _Ret, typename... _Args, typename... _BoundArgs> struct _Bind_check_arity<_Ret (*)(_Args......), _BoundArgs...> { static_assert(sizeof...(_BoundArgs) >= sizeof...(_Args), "Wrong number of arguments for function"); }; template<typename _Tp, typename _Class, typename... _BoundArgs> struct _Bind_check_arity<_Tp _Class::*, _BoundArgs...> { using _Arity = typename _Mem_fn<_Tp _Class::*>::_Arity; using _Varargs = typename _Mem_fn<_Tp _Class::*>::_Varargs; static_assert(_Varargs::value ? sizeof...(_BoundArgs) >= _Arity::value + 1 : sizeof...(_BoundArgs) == _Arity::value + 1, "Wrong number of arguments for pointer-to-member"); }; // Trait type used to remove std::bind() from overload set via SFINAE // when first argument has integer type, so that std::bind() will // not be a better match than ::bind() from the BSD Sockets API. template<typename _Tp, typename _Tp2 = typename decay<_Tp>::type> using __is_socketlike = __or_<is_integral<_Tp2>, is_enum<_Tp2>>; template<bool _SocketLike, typename _Func, typename... _BoundArgs> struct _Bind_helper : _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...> { typedef typename decay<_Func>::type __func_type; typedef _Bind<__func_type(typename decay<_BoundArgs>::type...)> type; }; // Partial specialization for is_socketlike == true, does not define // nested type so std::bind() will not participate in overload resolution // when the first argument might be a socket file descriptor. template<typename _Func, typename... _BoundArgs> struct _Bind_helper<true, _Func, _BoundArgs...> { }; /** * @brief Function template for std::bind. * @ingroup binders */ template<typename _Func, typename... _BoundArgs> inline _GLIBCXX20_CONSTEXPR typename _Bind_helper<__is_socketlike<_Func>::value, _Func, _BoundArgs...>::type bind(_Func&& __f, _BoundArgs&&... __args) { typedef _Bind_helper<false, _Func, _BoundArgs...> __helper_type; return typename __helper_type::type(std::forward<_Func>(__f), std::forward<_BoundArgs>(__args)...); } template<typename _Result, typename _Func, typename... _BoundArgs> struct _Bindres_helper : _Bind_check_arity<typename decay<_Func>::type, _BoundArgs...> { typedef typename decay<_Func>::type __functor_type; typedef _Bind_result<_Result, __functor_type(typename decay<_BoundArgs>::type...)> type; }; /** * @brief Function template for std::bind<R>. * @ingroup binders */ template<typename _Result, typename _Func, typename... _BoundArgs> inline _GLIBCXX20_CONSTEXPR typename _Bindres_helper<_Result, _Func, _BoundArgs...>::type bind(_Func&& __f, _BoundArgs&&... __args) { typedef _Bindres_helper<_Result, _Func, _BoundArgs...> __helper_type; return typename __helper_type::type(std::forward<_Func>(__f), std::forward<_BoundArgs>(__args)...); } #if __cplusplus > 201703L #define __cpp_lib_bind_front 201907L template<typename _Fd, typename... _BoundArgs> struct _Bind_front { static_assert(is_move_constructible_v<_Fd>); static_assert((is_move_constructible_v<_BoundArgs> && ...)); // First parameter is to ensure this constructor is never used // instead of the copy/move constructor. template<typename _Fn, typename... _Args> explicit constexpr _Bind_front(int, _Fn&& __fn, _Args&&... __args) noexcept(__and_<is_nothrow_constructible<_Fd, _Fn>, is_nothrow_constructible<_BoundArgs, _Args>...>::value) : _M_fd(std::forward<_Fn>(__fn)), _M_bound_args(std::forward<_Args>(__args)...) { static_assert(sizeof...(_Args) == sizeof...(_BoundArgs)); } _Bind_front(const _Bind_front&) = default; _Bind_front(_Bind_front&&) = default; _Bind_front& operator=(const _Bind_front&) = default; _Bind_front& operator=(_Bind_front&&) = default; ~_Bind_front() = default; template<typename... _CallArgs> constexpr invoke_result_t<_Fd&, _BoundArgs&..., _CallArgs...> operator()(_CallArgs&&... __call_args) & noexcept(is_nothrow_invocable_v<_Fd&, _BoundArgs&..., _CallArgs...>) { return _S_call(*this, _BoundIndices(), std::forward<_CallArgs>(__call_args)...); } template<typename... _CallArgs> constexpr invoke_result_t<const _Fd&, const _BoundArgs&..., _CallArgs...> operator()(_CallArgs&&... __call_args) const & noexcept(is_nothrow_invocable_v<const _Fd&, const _BoundArgs&..., _CallArgs...>) { return _S_call(*this, _BoundIndices(), std::forward<_CallArgs>(__call_args)...); } template<typename... _CallArgs> constexpr invoke_result_t<_Fd, _BoundArgs..., _CallArgs...> operator()(_CallArgs&&... __call_args) && noexcept(is_nothrow_invocable_v<_Fd, _BoundArgs..., _CallArgs...>) { return _S_call(std::move(*this), _BoundIndices(), std::forward<_CallArgs>(__call_args)...); } template<typename... _CallArgs> constexpr invoke_result_t<const _Fd, const _BoundArgs..., _CallArgs...> operator()(_CallArgs&&... __call_args) const && noexcept(is_nothrow_invocable_v<const _Fd, const _BoundArgs..., _CallArgs...>) { return _S_call(std::move(*this), _BoundIndices(), std::forward<_CallArgs>(__call_args)...); } private: using _BoundIndices = index_sequence_for<_BoundArgs...>; template<typename _Tp, size_t... _Ind, typename... _CallArgs> static constexpr decltype(auto) _S_call(_Tp&& __g, index_sequence<_Ind...>, _CallArgs&&... __call_args) { return std::invoke(std::forward<_Tp>(__g)._M_fd, std::get<_Ind>(std::forward<_Tp>(__g)._M_bound_args)..., std::forward<_CallArgs>(__call_args)...); } _Fd _M_fd; std::tuple<_BoundArgs...> _M_bound_args; }; template<typename _Fn, typename... _Args> using _Bind_front_t = _Bind_front<decay_t<_Fn>, decay_t<_Args>...>; template<typename _Fn, typename... _Args> constexpr _Bind_front_t<_Fn, _Args...> bind_front(_Fn&& __fn, _Args&&... __args) noexcept(is_nothrow_constructible_v<_Bind_front_t<_Fn, _Args...>, int, _Fn, _Args...>) { return _Bind_front_t<_Fn, _Args...>(0, std::forward<_Fn>(__fn), std::forward<_Args>(__args)...); } #endif #if __cplusplus >= 201402L /// Generalized negator. template<typename _Fn> class _Not_fn { template<typename _Fn2, typename... _Args> using __inv_res_t = typename __invoke_result<_Fn2, _Args...>::type; template<typename _Tp> static decltype(!std::declval<_Tp>()) _S_not() noexcept(noexcept(!std::declval<_Tp>())); public: template<typename _Fn2> constexpr _Not_fn(_Fn2&& __fn, int) : _M_fn(std::forward<_Fn2>(__fn)) { } _Not_fn(const _Not_fn& __fn) = default; _Not_fn(_Not_fn&& __fn) = default; ~_Not_fn() = default; // Macro to define operator() with given cv-qualifiers ref-qualifiers, // forwarding _M_fn and the function arguments with the same qualifiers, // and deducing the return type and exception-specification. #define _GLIBCXX_NOT_FN_CALL_OP( _QUALS ) \ template<typename... _Args> \ _GLIBCXX20_CONSTEXPR \ decltype(_S_not<__inv_res_t<_Fn _QUALS, _Args...>>()) \ operator()(_Args&&... __args) _QUALS \ noexcept(__is_nothrow_invocable<_Fn _QUALS, _Args...>::value \ && noexcept(_S_not<__inv_res_t<_Fn _QUALS, _Args...>>())) \ { \ return !std::__invoke(std::forward< _Fn _QUALS >(_M_fn), \ std::forward<_Args>(__args)...); \ } _GLIBCXX_NOT_FN_CALL_OP( & ) _GLIBCXX_NOT_FN_CALL_OP( const & ) _GLIBCXX_NOT_FN_CALL_OP( && ) _GLIBCXX_NOT_FN_CALL_OP( const && ) #undef _GLIBCXX_NOT_FN_CALL_OP private: _Fn _M_fn; }; template<typename _Tp, typename _Pred> struct __is_byte_like : false_type { }; template<typename _Tp> struct __is_byte_like<_Tp, equal_to<_Tp>> : __bool_constant<sizeof(_Tp) == 1 && is_integral<_Tp>::value> { }; template<typename _Tp> struct __is_byte_like<_Tp, equal_to<void>> : __bool_constant<sizeof(_Tp) == 1 && is_integral<_Tp>::value> { }; #if __cplusplus >= 201703L // Declare std::byte (full definition is in <cstddef>). enum class byte : unsigned char; template<> struct __is_byte_like<byte, equal_to<byte>> : true_type { }; template<> struct __is_byte_like<byte, equal_to<void>> : true_type { }; #define __cpp_lib_not_fn 201603 /// [func.not_fn] Function template not_fn template<typename _Fn> _GLIBCXX20_CONSTEXPR inline auto not_fn(_Fn&& __fn) noexcept(std::is_nothrow_constructible<std::decay_t<_Fn>, _Fn&&>::value) { return _Not_fn<std::decay_t<_Fn>>{std::forward<_Fn>(__fn), 0}; } // Searchers #define __cpp_lib_boyer_moore_searcher 201603 template<typename _ForwardIterator1, typename _BinaryPredicate = equal_to<>> class default_searcher { public: _GLIBCXX20_CONSTEXPR default_searcher(_ForwardIterator1 __pat_first, _ForwardIterator1 __pat_last, _BinaryPredicate __pred = _BinaryPredicate()) : _M_m(__pat_first, __pat_last, std::move(__pred)) { } template<typename _ForwardIterator2> _GLIBCXX20_CONSTEXPR pair<_ForwardIterator2, _ForwardIterator2> operator()(_ForwardIterator2 __first, _ForwardIterator2 __last) const { _ForwardIterator2 __first_ret = std::search(__first, __last, std::get<0>(_M_m), std::get<1>(_M_m), std::get<2>(_M_m)); auto __ret = std::make_pair(__first_ret, __first_ret); if (__ret.first != __last) std::advance(__ret.second, std::distance(std::get<0>(_M_m), std::get<1>(_M_m))); return __ret; } private: tuple<_ForwardIterator1, _ForwardIterator1, _BinaryPredicate> _M_m; }; template<typename _Key, typename _Tp, typename _Hash, typename _Pred> struct __boyer_moore_map_base { template<typename _RAIter> __boyer_moore_map_base(_RAIter __pat, size_t __patlen, _Hash&& __hf, _Pred&& __pred) : _M_bad_char{ __patlen, std::move(__hf), std::move(__pred) } { if (__patlen > 0) for (__diff_type __i = 0; __i < __patlen - 1; ++__i) _M_bad_char[__pat[__i]] = __patlen - 1 - __i; } using __diff_type = _Tp; __diff_type _M_lookup(_Key __key, __diff_type __not_found) const { auto __iter = _M_bad_char.find(__key); if (__iter == _M_bad_char.end()) return __not_found; return __iter->second; } _Pred _M_pred() const { return _M_bad_char.key_eq(); } _GLIBCXX_STD_C::unordered_map<_Key, _Tp, _Hash, _Pred> _M_bad_char; }; template<typename _Tp, size_t _Len, typename _Pred> struct __boyer_moore_array_base { template<typename _RAIter, typename _Unused> __boyer_moore_array_base(_RAIter __pat, size_t __patlen, _Unused&&, _Pred&& __pred) : _M_bad_char{ _GLIBCXX_STD_C::array<_Tp, _Len>{}, std::move(__pred) } { std::get<0>(_M_bad_char).fill(__patlen); if (__patlen > 0) for (__diff_type __i = 0; __i < __patlen - 1; ++__i) { auto __ch = __pat[__i]; using _UCh = make_unsigned_t<decltype(__ch)>; auto __uch = static_cast<_UCh>(__ch); std::get<0>(_M_bad_char)[__uch] = __patlen - 1 - __i; } } using __diff_type = _Tp; template<typename _Key> __diff_type _M_lookup(_Key __key, __diff_type __not_found) const { auto __ukey = static_cast<make_unsigned_t<_Key>>(__key); if (__ukey >= _Len) return __not_found; return std::get<0>(_M_bad_char)[__ukey]; } const _Pred& _M_pred() const { return std::get<1>(_M_bad_char); } tuple<_GLIBCXX_STD_C::array<_Tp, _Len>, _Pred> _M_bad_char; }; // Use __boyer_moore_array_base when pattern consists of narrow characters // (or std::byte) and uses std::equal_to as the predicate. template<typename _RAIter, typename _Hash, typename _Pred, typename _Val = typename iterator_traits<_RAIter>::value_type, typename _Diff = typename iterator_traits<_RAIter>::difference_type> using __boyer_moore_base_t = conditional_t<__is_byte_like<_Val, _Pred>::value, __boyer_moore_array_base<_Diff, 256, _Pred>, __boyer_moore_map_base<_Val, _Diff, _Hash, _Pred>>; template<typename _RAIter, typename _Hash = hash<typename iterator_traits<_RAIter>::value_type>, typename _BinaryPredicate = equal_to<>> class boyer_moore_searcher : __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate> { using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>; using typename _Base::__diff_type; public: boyer_moore_searcher(_RAIter __pat_first, _RAIter __pat_last, _Hash __hf = _Hash(), _BinaryPredicate __pred = _BinaryPredicate()); template<typename _RandomAccessIterator2> pair<_RandomAccessIterator2, _RandomAccessIterator2> operator()(_RandomAccessIterator2 __first, _RandomAccessIterator2 __last) const; private: bool _M_is_prefix(_RAIter __word, __diff_type __len, __diff_type __pos) { const auto& __pred = this->_M_pred(); __diff_type __suffixlen = __len - __pos; for (__diff_type __i = 0; __i < __suffixlen; ++__i) if (!__pred(__word[__i], __word[__pos + __i])) return false; return true; } __diff_type _M_suffix_length(_RAIter __word, __diff_type __len, __diff_type __pos) { const auto& __pred = this->_M_pred(); __diff_type __i = 0; while (__pred(__word[__pos - __i], __word[__len - 1 - __i]) && __i < __pos) { ++__i; } return __i; } template<typename _Tp> __diff_type _M_bad_char_shift(_Tp __c) const { return this->_M_lookup(__c, _M_pat_end - _M_pat); } _RAIter _M_pat; _RAIter _M_pat_end; _GLIBCXX_STD_C::vector<__diff_type> _M_good_suffix; }; template<typename _RAIter, typename _Hash = hash<typename iterator_traits<_RAIter>::value_type>, typename _BinaryPredicate = equal_to<>> class boyer_moore_horspool_searcher : __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate> { using _Base = __boyer_moore_base_t<_RAIter, _Hash, _BinaryPredicate>; using typename _Base::__diff_type; public: boyer_moore_horspool_searcher(_RAIter __pat, _RAIter __pat_end, _Hash __hf = _Hash(), _BinaryPredicate __pred = _BinaryPredicate()) : _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)), _M_pat(__pat), _M_pat_end(__pat_end) { } template<typename _RandomAccessIterator2> pair<_RandomAccessIterator2, _RandomAccessIterator2> operator()(_RandomAccessIterator2 __first, _RandomAccessIterator2 __last) const { const auto& __pred = this->_M_pred(); auto __patlen = _M_pat_end - _M_pat; if (__patlen == 0) return std::make_pair(__first, __first); auto __len = __last - __first; while (__len >= __patlen) { for (auto __scan = __patlen - 1; __pred(__first[__scan], _M_pat[__scan]); --__scan) if (__scan == 0) return std::make_pair(__first, __first + __patlen); auto __shift = _M_bad_char_shift(__first[__patlen - 1]); __len -= __shift; __first += __shift; } return std::make_pair(__last, __last); } private: template<typename _Tp> __diff_type _M_bad_char_shift(_Tp __c) const { return this->_M_lookup(__c, _M_pat_end - _M_pat); } _RAIter _M_pat; _RAIter _M_pat_end; }; template<typename _RAIter, typename _Hash, typename _BinaryPredicate> boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>:: boyer_moore_searcher(_RAIter __pat, _RAIter __pat_end, _Hash __hf, _BinaryPredicate __pred) : _Base(__pat, __pat_end - __pat, std::move(__hf), std::move(__pred)), _M_pat(__pat), _M_pat_end(__pat_end), _M_good_suffix(__pat_end - __pat) { auto __patlen = __pat_end - __pat; if (__patlen == 0) return; __diff_type __last_prefix = __patlen - 1; for (__diff_type __p = __patlen - 1; __p >= 0; --__p) { if (_M_is_prefix(__pat, __patlen, __p + 1)) __last_prefix = __p + 1; _M_good_suffix[__p] = __last_prefix + (__patlen - 1 - __p); } for (__diff_type __p = 0; __p < __patlen - 1; ++__p) { auto __slen = _M_suffix_length(__pat, __patlen, __p); auto __pos = __patlen - 1 - __slen; if (!__pred(__pat[__p - __slen], __pat[__pos])) _M_good_suffix[__pos] = __patlen - 1 - __p + __slen; } } template<typename _RAIter, typename _Hash, typename _BinaryPredicate> template<typename _RandomAccessIterator2> pair<_RandomAccessIterator2, _RandomAccessIterator2> boyer_moore_searcher<_RAIter, _Hash, _BinaryPredicate>:: operator()(_RandomAccessIterator2 __first, _RandomAccessIterator2 __last) const { auto __patlen = _M_pat_end - _M_pat; if (__patlen == 0) return std::make_pair(__first, __first); const auto& __pred = this->_M_pred(); __diff_type __i = __patlen - 1; auto __stringlen = __last - __first; while (__i < __stringlen) { __diff_type __j = __patlen - 1; while (__j >= 0 && __pred(__first[__i], _M_pat[__j])) { --__i; --__j; } if (__j < 0) { const auto __match = __first + __i + 1; return std::make_pair(__match, __match + __patlen); } __i += std::max(_M_bad_char_shift(__first[__i]), _M_good_suffix[__j]); } return std::make_pair(__last, __last); } #endif // C++17 #endif // C++14 _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++11 #endif // _GLIBCXX_FUNCTIONAL