//usr/include/c++/11/bits
146 items
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.. / Parent Directory
algorithmfwd.h — 23.97 KB
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align.h — 3.62 KB
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alloc_traits.h — 26.98 KB
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allocated_ptr.h — 3.25 KB
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allocator.h — 9.51 KB
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atomic_base.h — 56.07 KB
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atomic_futex.h — 12.1 KB
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atomic_lockfree_defines.h — 2.3 KB
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atomic_timed_wait.h — 13.21 KB
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atomic_wait.h — 12.26 KB
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basic_ios.h — 15.7 KB
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basic_ios.tcc — 5.94 KB
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basic_string.h — 246.04 KB
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basic_string.tcc — 52.92 KB
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boost_concept_check.h — 26.54 KB
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c++0x_warning.h — 1.44 KB
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char_traits.h — 28.66 KB
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charconv.h — 3.35 KB
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codecvt.h — 24.9 KB
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concept_check.h — 3.34 KB
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cpp_type_traits.h — 13.67 KB
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cxxabi_forced.h — 1.77 KB
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cxxabi_init_exception.h — 2.17 KB
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deque.tcc — 41.37 KB
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enable_special_members.h — 12.16 KB
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erase_if.h — 2.02 KB
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exception.h — 2.45 KB
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exception_defines.h — 1.61 KB
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exception_ptr.h — 7.46 KB
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forward_list.h — 49.21 KB
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forward_list.tcc — 13.71 KB
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fs_dir.h — 16.23 KB
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fs_fwd.h — 10.65 KB
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fs_ops.h — 10.49 KB
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fs_path.h — 39.49 KB
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fstream.tcc — 32.88 KB
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functexcept.h — 3.43 KB
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functional_hash.h — 8.39 KB
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gslice.h — 5.39 KB
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gslice_array.h — 7.71 KB
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hash_bytes.h — 2.1 KB
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hashtable.h — 82.94 KB
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hashtable_policy.h — 60.84 KB
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indirect_array.h — 7.72 KB
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invoke.h — 5.92 KB
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ios_base.h — 31.19 KB
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istream.tcc — 30.85 KB
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iterator_concepts.h — 32.55 KB
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list.tcc — 16.8 KB
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locale_classes.h — 24.46 KB
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locale_classes.tcc — 8.18 KB
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locale_conv.h — 18.38 KB
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locale_facets.h — 91.46 KB
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locale_facets.tcc — 39.51 KB
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locale_facets_nonio.h — 68.07 KB
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locale_facets_nonio.tcc — 46.42 KB
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localefwd.h — 5.8 KB
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mask_array.h — 7.54 KB
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max_size_type.h — 22.18 KB
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memoryfwd.h — 2.45 KB
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move.h — 6.64 KB
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nested_exception.h — 4.77 KB
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node_handle.h — 11.07 KB
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ostream.tcc — 12.03 KB
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ostream_insert.h — 3.94 KB
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parse_numbers.h — 7.79 KB
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postypes.h — 8.27 KB
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predefined_ops.h — 9.94 KB
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ptr_traits.h — 6.55 KB
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quoted_string.h — 4.93 KB
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random.h — 174.18 KB
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random.tcc — 103.21 KB
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range_access.h — 10.46 KB
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ranges_algo.h — 114.09 KB
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ranges_algobase.h — 18.43 KB
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ranges_base.h — 23.82 KB
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ranges_cmp.h — 5.88 KB
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ranges_uninitialized.h — 17.71 KB
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ranges_util.h — 20.11 KB
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refwrap.h — 12.9 KB
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regex.h — 101.53 KB
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regex.tcc — 16.11 KB
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regex_automaton.h — 10.54 KB
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regex_automaton.tcc — 7.54 KB
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regex_compiler.h — 15.84 KB
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regex_compiler.tcc — 18.71 KB
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regex_constants.h — 15.18 KB
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regex_error.h — 4.9 KB
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regex_executor.h — 8.64 KB
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regex_executor.tcc — 18.4 KB
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regex_scanner.h — 6.88 KB
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regex_scanner.tcc — 14.89 KB
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semaphore_base.h — 7.75 KB
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shared_ptr.h — 30.25 KB
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shared_ptr_atomic.h — 9.64 KB
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shared_ptr_base.h — 53.62 KB
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slice_array.h — 9.39 KB
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specfun.h — 46.13 KB
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sstream.tcc — 9.91 KB
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std_abs.h — 3.28 KB
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std_function.h — 22.33 KB
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std_mutex.h — 6.29 KB
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std_thread.h — 8.39 KB
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stl_algo.h — 209.67 KB
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stl_algobase.h — 74.6 KB
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stl_bvector.h — 34.74 KB
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stl_construct.h — 8.59 KB
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stl_deque.h — 75.17 KB
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stl_function.h — 42.87 KB
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stl_heap.h — 20.27 KB
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stl_iterator.h — 77 KB
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stl_iterator_base_funcs.h — 7.99 KB
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stl_iterator_base_types.h — 9.44 KB
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stl_list.h — 68.14 KB
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stl_map.h — 53.41 KB
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stl_multimap.h — 42.51 KB
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stl_multiset.h — 36.79 KB
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stl_numeric.h — 14.26 KB
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stl_pair.h — 19.66 KB
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stl_queue.h — 24.45 KB
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stl_raw_storage_iter.h — 3.74 KB
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stl_relops.h — 4.49 KB
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stl_set.h — 37.05 KB
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stl_stack.h — 12.39 KB
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stl_tempbuf.h — 8.45 KB
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stl_tree.h — 72.16 KB
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stl_uninitialized.h — 33.22 KB
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stl_vector.h — 64.37 KB
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stream_iterator.h — 7.52 KB
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streambuf.tcc — 4.81 KB
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streambuf_iterator.h — 15.17 KB
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string_view.tcc — 7 KB
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stringfwd.h — 2.63 KB
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this_thread_sleep.h — 3.23 KB
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uniform_int_dist.h — 12.75 KB
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unique_lock.h — 6 KB
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unique_ptr.h — 31.77 KB
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unordered_map.h — 74.87 KB
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unordered_set.h — 61.46 KB
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uses_allocator.h — 6.74 KB
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uses_allocator_args.h — 7.38 KB
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valarray_after.h — 22.74 KB
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valarray_array.h — 20.8 KB
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valarray_array.tcc — 7.08 KB
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valarray_before.h — 18.69 KB
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vector.tcc — 30.26 KB
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// Implementation of std::function -*- C++ -*- // Copyright (C) 2004-2021 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 // . /** @file include/bits/std_function.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{functional} */ #ifndef _GLIBCXX_STD_FUNCTION_H #define _GLIBCXX_STD_FUNCTION_H 1 #pragma GCC system_header #if __cplusplus < 201103L # include #else #include #include #include #include #include namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @brief Exception class thrown when class template function's * operator() is called with an empty target. * @ingroup exceptions */ class bad_function_call : public std::exception { public: virtual ~bad_function_call() noexcept; const char* what() const noexcept; }; /** * Trait identifying "location-invariant" types, meaning that the * address of the object (or any of its members) will not escape. * Trivially copyable types are location-invariant and users can * specialize this trait for other types. */ template struct __is_location_invariant : is_trivially_copyable<_Tp>::type { }; class _Undefined_class; union _Nocopy_types { void* _M_object; const void* _M_const_object; void (*_M_function_pointer)(); void (_Undefined_class::*_M_member_pointer)(); }; union [[gnu::may_alias]] _Any_data { void* _M_access() { return &_M_pod_data[0]; } const void* _M_access() const { return &_M_pod_data[0]; } template _Tp& _M_access() { return *static_cast<_Tp*>(_M_access()); } template const _Tp& _M_access() const { return *static_cast(_M_access()); } _Nocopy_types _M_unused; char _M_pod_data[sizeof(_Nocopy_types)]; }; enum _Manager_operation { __get_type_info, __get_functor_ptr, __clone_functor, __destroy_functor }; template class function; /// Base class of all polymorphic function object wrappers. class _Function_base { public: static const size_t _M_max_size = sizeof(_Nocopy_types); static const size_t _M_max_align = __alignof__(_Nocopy_types); template class _Base_manager { protected: static const bool __stored_locally = (__is_location_invariant<_Functor>::value && sizeof(_Functor) <= _M_max_size && __alignof__(_Functor) <= _M_max_align && (_M_max_align % __alignof__(_Functor) == 0)); using _Local_storage = integral_constant; // Retrieve a pointer to the function object static _Functor* _M_get_pointer(const _Any_data& __source) { if _GLIBCXX17_CONSTEXPR (__stored_locally) { const _Functor& __f = __source._M_access<_Functor>(); return const_cast<_Functor*>(std::__addressof(__f)); } else // have stored a pointer return __source._M_access<_Functor*>(); } private: // Construct a location-invariant function object that fits within // an _Any_data structure. template static void _M_create(_Any_data& __dest, _Fn&& __f, true_type) { ::new (__dest._M_access()) _Functor(std::forward<_Fn>(__f)); } // Construct a function object on the heap and store a pointer. template static void _M_create(_Any_data& __dest, _Fn&& __f, false_type) { __dest._M_access<_Functor*>() = new _Functor(std::forward<_Fn>(__f)); } // Destroy an object stored in the internal buffer. static void _M_destroy(_Any_data& __victim, true_type) { __victim._M_access<_Functor>().~_Functor(); } // Destroy an object located on the heap. static void _M_destroy(_Any_data& __victim, false_type) { delete __victim._M_access<_Functor*>(); } public: static bool _M_manager(_Any_data& __dest, const _Any_data& __source, _Manager_operation __op) { switch (__op) { case __get_type_info: #if __cpp_rtti __dest._M_access() = &typeid(_Functor); #else __dest._M_access() = nullptr; #endif break; case __get_functor_ptr: __dest._M_access<_Functor*>() = _M_get_pointer(__source); break; case __clone_functor: _M_init_functor(__dest, *const_cast(_M_get_pointer(__source))); break; case __destroy_functor: _M_destroy(__dest, _Local_storage()); break; } return false; } template static void _M_init_functor(_Any_data& __functor, _Fn&& __f) noexcept(__and_<_Local_storage, is_nothrow_constructible<_Functor, _Fn>>::value) { _M_create(__functor, std::forward<_Fn>(__f), _Local_storage()); } template static bool _M_not_empty_function(const function<_Signature>& __f) { return static_cast(__f); } template static bool _M_not_empty_function(_Tp* __fp) { return __fp != nullptr; } template static bool _M_not_empty_function(_Tp _Class::* __mp) { return __mp != nullptr; } template static bool _M_not_empty_function(const _Tp&) { return true; } }; _Function_base() = default; ~_Function_base() { if (_M_manager) _M_manager(_M_functor, _M_functor, __destroy_functor); } bool _M_empty() const { return !_M_manager; } using _Manager_type = bool (*)(_Any_data&, const _Any_data&, _Manager_operation); _Any_data _M_functor{}; _Manager_type _M_manager{}; }; template class _Function_handler; template class _Function_handler<_Res(_ArgTypes...), _Functor> : public _Function_base::_Base_manager<_Functor> { using _Base = _Function_base::_Base_manager<_Functor>; public: static bool _M_manager(_Any_data& __dest, const _Any_data& __source, _Manager_operation __op) { switch (__op) { #if __cpp_rtti case __get_type_info: __dest._M_access() = &typeid(_Functor); break; #endif case __get_functor_ptr: __dest._M_access<_Functor*>() = _Base::_M_get_pointer(__source); break; default: _Base::_M_manager(__dest, __source, __op); } return false; } static _Res _M_invoke(const _Any_data& __functor, _ArgTypes&&... __args) { return std::__invoke_r<_Res>(*_Base::_M_get_pointer(__functor), std::forward<_ArgTypes>(__args)...); } template static constexpr bool _S_nothrow_init() noexcept { return __and_>::value; } }; // Specialization for invalid types template<> class _Function_handler { public: static bool _M_manager(_Any_data&, const _Any_data&, _Manager_operation) { return false; } }; // Avoids instantiating ill-formed specializations of _Function_handler // in std::function<_Signature>::target<_Functor>(). // e.g. _Function_handler and _Function_handler // would be ill-formed. template::value> struct _Target_handler : _Function_handler<_Signature, typename remove_cv<_Functor>::type> { }; template struct _Target_handler<_Signature, _Functor, false> : _Function_handler { }; /** * @brief Polymorphic function wrapper. * @ingroup functors * @since C++11 */ template class function<_Res(_ArgTypes...)> : public _Maybe_unary_or_binary_function<_Res, _ArgTypes...>, private _Function_base { // Equivalent to std::decay_t except that it produces an invalid type // if the decayed type is the current specialization of std::function. template, function>::value> using _Decay_t = typename __enable_if_t>::type; template, typename _Res2 = __invoke_result<_DFunc&, _ArgTypes...>> struct _Callable : __is_invocable_impl<_Res2, _Res>::type { }; template using _Requires = __enable_if_t<_Cond::value, _Tp>; template using _Handler = _Function_handler<_Res(_ArgTypes...), __decay_t<_Functor>>; public: typedef _Res result_type; // [3.7.2.1] construct/copy/destroy /** * @brief Default construct creates an empty function call wrapper. * @post `!(bool)*this` */ function() noexcept : _Function_base() { } /** * @brief Creates an empty function call wrapper. * @post @c !(bool)*this */ function(nullptr_t) noexcept : _Function_base() { } /** * @brief %Function copy constructor. * @param __x A %function object with identical call signature. * @post `bool(*this) == bool(__x)` * * The newly-created %function contains a copy of the target of * `__x` (if it has one). */ function(const function& __x) : _Function_base() { if (static_cast(__x)) { __x._M_manager(_M_functor, __x._M_functor, __clone_functor); _M_invoker = __x._M_invoker; _M_manager = __x._M_manager; } } /** * @brief %Function move constructor. * @param __x A %function object rvalue with identical call signature. * * The newly-created %function contains the target of `__x` * (if it has one). */ function(function&& __x) noexcept : _Function_base(), _M_invoker(__x._M_invoker) { if (static_cast(__x)) { _M_functor = __x._M_functor; _M_manager = __x._M_manager; __x._M_manager = nullptr; __x._M_invoker = nullptr; } } /** * @brief Builds a %function that targets a copy of the incoming * function object. * @param __f A %function object that is callable with parameters of * type `ArgTypes...` and returns a value convertible to `Res`. * * The newly-created %function object will target a copy of * `__f`. If `__f` is `reference_wrapper`, then this function * object will contain a reference to the function object `__f.get()`. * If `__f` is a null function pointer, null pointer-to-member, or * empty `std::function`, the newly-created object will be empty. * * If `__f` is a non-null function pointer or an object of type * `reference_wrapper`, this function will not throw. */ // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2774. std::function construction vs assignment template>> function(_Functor&& __f) noexcept(_Handler<_Functor>::template _S_nothrow_init<_Functor>()) : _Function_base() { static_assert(is_copy_constructible<__decay_t<_Functor>>::value, "std::function target must be copy-constructible"); static_assert(is_constructible<__decay_t<_Functor>, _Functor>::value, "std::function target must be constructible from the " "constructor argument"); using _My_handler = _Handler<_Functor>; if (_My_handler::_M_not_empty_function(__f)) { _My_handler::_M_init_functor(_M_functor, std::forward<_Functor>(__f)); _M_invoker = &_My_handler::_M_invoke; _M_manager = &_My_handler::_M_manager; } } /** * @brief %Function assignment operator. * @param __x A %function with identical call signature. * @post @c (bool)*this == (bool)x * @returns @c *this * * The target of @a __x is copied to @c *this. If @a __x has no * target, then @c *this will be empty. * * If @a __x targets a function pointer or a reference to a function * object, then this operation will not throw an %exception. */ function& operator=(const function& __x) { function(__x).swap(*this); return *this; } /** * @brief %Function move-assignment operator. * @param __x A %function rvalue with identical call signature. * @returns @c *this * * The target of @a __x is moved to @c *this. If @a __x has no * target, then @c *this will be empty. * * If @a __x targets a function pointer or a reference to a function * object, then this operation will not throw an %exception. */ function& operator=(function&& __x) noexcept { function(std::move(__x)).swap(*this); return *this; } /** * @brief %Function assignment to zero. * @post @c !(bool)*this * @returns @c *this * * The target of @c *this is deallocated, leaving it empty. */ function& operator=(nullptr_t) noexcept { if (_M_manager) { _M_manager(_M_functor, _M_functor, __destroy_functor); _M_manager = nullptr; _M_invoker = nullptr; } return *this; } /** * @brief %Function assignment to a new target. * @param __f A %function object that is callable with parameters of * type @c T1, @c T2, ..., @c TN and returns a value convertible * to @c Res. * @return @c *this * * This %function object wrapper will target a copy of @a * __f. If @a __f is @c reference_wrapper, then this function * object will contain a reference to the function object @c * __f.get(). If @a __f is a NULL function pointer or NULL * pointer-to-member, @c this object will be empty. * * If @a __f is a non-NULL function pointer or an object of type @c * reference_wrapper, this function will not throw. */ template _Requires<_Callable<_Functor>, function&> operator=(_Functor&& __f) noexcept(_Handler<_Functor>::template _S_nothrow_init<_Functor>()) { function(std::forward<_Functor>(__f)).swap(*this); return *this; } /// @overload template function& operator=(reference_wrapper<_Functor> __f) noexcept { function(__f).swap(*this); return *this; } // [3.7.2.2] function modifiers /** * @brief Swap the targets of two %function objects. * @param __x A %function with identical call signature. * * Swap the targets of @c this function object and @a __f. This * function will not throw an %exception. */ void swap(function& __x) noexcept { std::swap(_M_functor, __x._M_functor); std::swap(_M_manager, __x._M_manager); std::swap(_M_invoker, __x._M_invoker); } // [3.7.2.3] function capacity /** * @brief Determine if the %function wrapper has a target. * * @return @c true when this %function object contains a target, * or @c false when it is empty. * * This function will not throw an %exception. */ explicit operator bool() const noexcept { return !_M_empty(); } // [3.7.2.4] function invocation /** * @brief Invokes the function targeted by @c *this. * @returns the result of the target. * @throws bad_function_call when @c !(bool)*this * * The function call operator invokes the target function object * stored by @c this. */ _Res operator()(_ArgTypes... __args) const { if (_M_empty()) __throw_bad_function_call(); return _M_invoker(_M_functor, std::forward<_ArgTypes>(__args)...); } #if __cpp_rtti // [3.7.2.5] function target access /** * @brief Determine the type of the target of this function object * wrapper. * * @returns the type identifier of the target function object, or * @c typeid(void) if @c !(bool)*this. * * This function will not throw an %exception. */ const type_info& target_type() const noexcept { if (_M_manager) { _Any_data __typeinfo_result; _M_manager(__typeinfo_result, _M_functor, __get_type_info); if (auto __ti = __typeinfo_result._M_access()) return *__ti; } return typeid(void); } #endif /** * @brief Access the stored target function object. * * @return Returns a pointer to the stored target function object, * if @c typeid(_Functor).equals(target_type()); otherwise, a null * pointer. * * This function does not throw exceptions. * * @{ */ template _Functor* target() noexcept { const function* __const_this = this; const _Functor* __func = __const_this->template target<_Functor>(); // If is_function_v<_Functor> is true then const_cast<_Functor*> // would be ill-formed, so use *const_cast<_Functor**> instead. return *const_cast<_Functor**>(&__func); } template const _Functor* target() const noexcept { if _GLIBCXX17_CONSTEXPR (is_object<_Functor>::value) { // For C++11 and C++14 if-constexpr is not used above, so // _Target_handler avoids ill-formed _Function_handler types. using _Handler = _Target_handler<_Res(_ArgTypes...), _Functor>; if (_M_manager == &_Handler::_M_manager #if __cpp_rtti || (_M_manager && typeid(_Functor) == target_type()) #endif ) { _Any_data __ptr; _M_manager(__ptr, _M_functor, __get_functor_ptr); return __ptr._M_access(); } } return nullptr; } /// @} private: using _Invoker_type = _Res (*)(const _Any_data&, _ArgTypes&&...); _Invoker_type _M_invoker = nullptr; }; #if __cpp_deduction_guides >= 201606 template struct __function_guide_helper { }; template struct __function_guide_helper< _Res (_Tp::*) (_Args...) noexcept(_Nx) > { using type = _Res(_Args...); }; template struct __function_guide_helper< _Res (_Tp::*) (_Args...) & noexcept(_Nx) > { using type = _Res(_Args...); }; template struct __function_guide_helper< _Res (_Tp::*) (_Args...) const noexcept(_Nx) > { using type = _Res(_Args...); }; template struct __function_guide_helper< _Res (_Tp::*) (_Args...) const & noexcept(_Nx) > { using type = _Res(_Args...); }; template function(_Res(*)(_ArgTypes...)) -> function<_Res(_ArgTypes...)>; template::type> function(_Functor) -> function<_Signature>; #endif // [20.7.15.2.6] null pointer comparisons /** * @brief Compares a polymorphic function object wrapper against 0 * (the NULL pointer). * @returns @c true if the wrapper has no target, @c false otherwise * * This function will not throw an %exception. */ template inline bool operator==(const function<_Res(_Args...)>& __f, nullptr_t) noexcept { return !static_cast(__f); } #if __cpp_impl_three_way_comparison < 201907L /// @overload template inline bool operator==(nullptr_t, const function<_Res(_Args...)>& __f) noexcept { return !static_cast(__f); } /** * @brief Compares a polymorphic function object wrapper against 0 * (the NULL pointer). * @returns @c false if the wrapper has no target, @c true otherwise * * This function will not throw an %exception. */ template inline bool operator!=(const function<_Res(_Args...)>& __f, nullptr_t) noexcept { return static_cast(__f); } /// @overload template inline bool operator!=(nullptr_t, const function<_Res(_Args...)>& __f) noexcept { return static_cast(__f); } #endif // [20.7.15.2.7] specialized algorithms /** * @brief Swap the targets of two polymorphic function object wrappers. * * This function will not throw an %exception. */ // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2062. Effect contradictions w/o no-throw guarantee of std::function swaps template inline void swap(function<_Res(_Args...)>& __x, function<_Res(_Args...)>& __y) noexcept { __x.swap(__y); } #if __cplusplus >= 201703L namespace __detail::__variant { template struct _Never_valueless_alt; // see // Provide the strong exception-safety guarantee when emplacing a // function into a variant. template struct _Never_valueless_alt> : std::true_type { }; } // namespace __detail::__variant #endif // C++17 _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++11 #endif // _GLIBCXX_STD_FUNCTION_H