//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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// shared_ptr and weak_ptr implementation -*- C++ -*- // Copyright (C) 2007-2021 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 // . // GCC Note: Based on files from version 1.32.0 of the Boost library. // shared_count.hpp // Copyright (c) 2001, 2002, 2003 Peter Dimov and Multi Media Ltd. // shared_ptr.hpp // Copyright (C) 1998, 1999 Greg Colvin and Beman Dawes. // Copyright (C) 2001, 2002, 2003 Peter Dimov // weak_ptr.hpp // Copyright (C) 2001, 2002, 2003 Peter Dimov // enable_shared_from_this.hpp // Copyright (C) 2002 Peter Dimov // Distributed under the Boost Software License, Version 1.0. (See // accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) /** @file * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{memory} */ #ifndef _SHARED_PTR_H #define _SHARED_PTR_H 1 #include // std::basic_ostream #include namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @addtogroup pointer_abstractions * @{ */ // 20.7.2.2.11 shared_ptr I/O /// Write the stored pointer to an ostream. /// @relates shared_ptr template inline std::basic_ostream<_Ch, _Tr>& operator<<(std::basic_ostream<_Ch, _Tr>& __os, const __shared_ptr<_Tp, _Lp>& __p) { __os << __p.get(); return __os; } template inline _Del* get_deleter(const __shared_ptr<_Tp, _Lp>& __p) noexcept { #if __cpp_rtti return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); #else return 0; #endif } /// 20.7.2.2.10 shared_ptr get_deleter /// If `__p` has a deleter of type `_Del`, return a pointer to it. /// @relates shared_ptr template inline _Del* get_deleter(const shared_ptr<_Tp>& __p) noexcept { #if __cpp_rtti return static_cast<_Del*>(__p._M_get_deleter(typeid(_Del))); #else return 0; #endif } /** * @brief A smart pointer with reference-counted copy semantics. * * A `shared_ptr` object is either empty or _owns_ a pointer passed * to the constructor. Copies of a `shared_ptr` share ownership of * the same pointer. When the last `shared_ptr` that owns the pointer * is destroyed or reset, the owned pointer is freed (either by `delete` * or by invoking a custom deleter that was passed to the constructor). * * A `shared_ptr` also stores another pointer, which is usually * (but not always) the same pointer as it owns. The stored pointer * can be retrieved by calling the `get()` member function. * * The equality and relational operators for `shared_ptr` only compare * the stored pointer returned by `get()`, not the owned pointer. * To test whether two `shared_ptr` objects share ownership of the same * pointer see `std::shared_ptr::owner_before` and `std::owner_less`. */ template class shared_ptr : public __shared_ptr<_Tp> { template using _Constructible = typename enable_if< is_constructible<__shared_ptr<_Tp>, _Args...>::value >::type; template using _Assignable = typename enable_if< is_assignable<__shared_ptr<_Tp>&, _Arg>::value, shared_ptr& >::type; public: /// The type pointed to by the stored pointer, remove_extent_t<_Tp> using element_type = typename __shared_ptr<_Tp>::element_type; #if __cplusplus >= 201703L # define __cpp_lib_shared_ptr_weak_type 201606 /// The corresponding weak_ptr type for this shared_ptr using weak_type = weak_ptr<_Tp>; #endif /** * @brief Construct an empty %shared_ptr. * @post use_count()==0 && get()==0 */ constexpr shared_ptr() noexcept : __shared_ptr<_Tp>() { } shared_ptr(const shared_ptr&) noexcept = default; ///< Copy constructor /** * @brief Construct a %shared_ptr that owns the pointer @a __p. * @param __p A pointer that is convertible to element_type*. * @post use_count() == 1 && get() == __p * @throw std::bad_alloc, in which case @c delete @a __p is called. */ template> explicit shared_ptr(_Yp* __p) : __shared_ptr<_Tp>(__p) { } /** * @brief Construct a %shared_ptr that owns the pointer @a __p * and the deleter @a __d. * @param __p A pointer. * @param __d A deleter. * @post use_count() == 1 && get() == __p * @throw std::bad_alloc, in which case @a __d(__p) is called. * * Requirements: _Deleter's copy constructor and destructor must * not throw * * __shared_ptr will release __p by calling __d(__p) */ template> shared_ptr(_Yp* __p, _Deleter __d) : __shared_ptr<_Tp>(__p, std::move(__d)) { } /** * @brief Construct a %shared_ptr that owns a null pointer * and the deleter @a __d. * @param __p A null pointer constant. * @param __d A deleter. * @post use_count() == 1 && get() == __p * @throw std::bad_alloc, in which case @a __d(__p) is called. * * Requirements: _Deleter's copy constructor and destructor must * not throw * * The last owner will call __d(__p) */ template shared_ptr(nullptr_t __p, _Deleter __d) : __shared_ptr<_Tp>(__p, std::move(__d)) { } /** * @brief Construct a %shared_ptr that owns the pointer @a __p * and the deleter @a __d. * @param __p A pointer. * @param __d A deleter. * @param __a An allocator. * @post use_count() == 1 && get() == __p * @throw std::bad_alloc, in which case @a __d(__p) is called. * * Requirements: _Deleter's copy constructor and destructor must * not throw _Alloc's copy constructor and destructor must not * throw. * * __shared_ptr will release __p by calling __d(__p) */ template> shared_ptr(_Yp* __p, _Deleter __d, _Alloc __a) : __shared_ptr<_Tp>(__p, std::move(__d), std::move(__a)) { } /** * @brief Construct a %shared_ptr that owns a null pointer * and the deleter @a __d. * @param __p A null pointer constant. * @param __d A deleter. * @param __a An allocator. * @post use_count() == 1 && get() == __p * @throw std::bad_alloc, in which case @a __d(__p) is called. * * Requirements: _Deleter's copy constructor and destructor must * not throw _Alloc's copy constructor and destructor must not * throw. * * The last owner will call __d(__p) */ template shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a) : __shared_ptr<_Tp>(__p, std::move(__d), std::move(__a)) { } // Aliasing constructor /** * @brief Constructs a `shared_ptr` instance that stores `__p` * and shares ownership with `__r`. * @param __r A `shared_ptr`. * @param __p A pointer that will remain valid while `*__r` is valid. * @post `get() == __p && use_count() == __r.use_count()` * * This can be used to construct a `shared_ptr` to a sub-object * of an object managed by an existing `shared_ptr`. The complete * object will remain valid while any `shared_ptr` owns it, even * if they don't store a pointer to the complete object. * * @code * shared_ptr> pii(new pair()); * shared_ptr pi(pii, &pii->first); * assert(pii.use_count() == 2); * @endcode */ template shared_ptr(const shared_ptr<_Yp>& __r, element_type* __p) noexcept : __shared_ptr<_Tp>(__r, __p) { } #if __cplusplus > 201703L // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2996. Missing rvalue overloads for shared_ptr operations /** * @brief Constructs a `shared_ptr` instance that stores `__p` * and shares ownership with `__r`. * @param __r A `shared_ptr`. * @param __p A pointer that will remain valid while `*__r` is valid. * @post `get() == __p && !__r.use_count() && !__r.get()` * * This can be used to construct a `shared_ptr` to a sub-object * of an object managed by an existing `shared_ptr`. The complete * object will remain valid while any `shared_ptr` owns it, even * if they don't store a pointer to the complete object. * * @code * shared_ptr> pii(new pair()); * shared_ptr pi1(pii, &pii->first); * assert(pii.use_count() == 2); * shared_ptr pi2(std::move(pii), &pii->second); * assert(pii.use_count() == 0); * @endcode */ template shared_ptr(shared_ptr<_Yp>&& __r, element_type* __p) noexcept : __shared_ptr<_Tp>(std::move(__r), __p) { } #endif /** * @brief If @a __r is empty, constructs an empty %shared_ptr; * otherwise construct a %shared_ptr that shares ownership * with @a __r. * @param __r A %shared_ptr. * @post get() == __r.get() && use_count() == __r.use_count() */ template&>> shared_ptr(const shared_ptr<_Yp>& __r) noexcept : __shared_ptr<_Tp>(__r) { } /** * @brief Move-constructs a %shared_ptr instance from @a __r. * @param __r A %shared_ptr rvalue. * @post *this contains the old value of @a __r, @a __r is empty. */ shared_ptr(shared_ptr&& __r) noexcept : __shared_ptr<_Tp>(std::move(__r)) { } /** * @brief Move-constructs a %shared_ptr instance from @a __r. * @param __r A %shared_ptr rvalue. * @post *this contains the old value of @a __r, @a __r is empty. */ template>> shared_ptr(shared_ptr<_Yp>&& __r) noexcept : __shared_ptr<_Tp>(std::move(__r)) { } /** * @brief Constructs a %shared_ptr that shares ownership with @a __r * and stores a copy of the pointer stored in @a __r. * @param __r A weak_ptr. * @post use_count() == __r.use_count() * @throw bad_weak_ptr when __r.expired(), * in which case the constructor has no effect. */ template&>> explicit shared_ptr(const weak_ptr<_Yp>& __r) : __shared_ptr<_Tp>(__r) { } #if _GLIBCXX_USE_DEPRECATED #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated-declarations" template>> shared_ptr(auto_ptr<_Yp>&& __r); #pragma GCC diagnostic pop #endif // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2399. shared_ptr's constructor from unique_ptr should be constrained template>> shared_ptr(unique_ptr<_Yp, _Del>&& __r) : __shared_ptr<_Tp>(std::move(__r)) { } #if __cplusplus <= 201402L && _GLIBCXX_USE_DEPRECATED // This non-standard constructor exists to support conversions that // were possible in C++11 and C++14 but are ill-formed in C++17. // If an exception is thrown this constructor has no effect. template, __sp_array_delete>* = 0> shared_ptr(unique_ptr<_Yp, _Del>&& __r) : __shared_ptr<_Tp>(std::move(__r), __sp_array_delete()) { } #endif /** * @brief Construct an empty %shared_ptr. * @post use_count() == 0 && get() == nullptr */ constexpr shared_ptr(nullptr_t) noexcept : shared_ptr() { } shared_ptr& operator=(const shared_ptr&) noexcept = default; template _Assignable&> operator=(const shared_ptr<_Yp>& __r) noexcept { this->__shared_ptr<_Tp>::operator=(__r); return *this; } #if _GLIBCXX_USE_DEPRECATED #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wdeprecated-declarations" template _Assignable> operator=(auto_ptr<_Yp>&& __r) { this->__shared_ptr<_Tp>::operator=(std::move(__r)); return *this; } #pragma GCC diagnostic pop #endif shared_ptr& operator=(shared_ptr&& __r) noexcept { this->__shared_ptr<_Tp>::operator=(std::move(__r)); return *this; } template _Assignable> operator=(shared_ptr<_Yp>&& __r) noexcept { this->__shared_ptr<_Tp>::operator=(std::move(__r)); return *this; } template _Assignable> operator=(unique_ptr<_Yp, _Del>&& __r) { this->__shared_ptr<_Tp>::operator=(std::move(__r)); return *this; } private: // This constructor is non-standard, it is used by allocate_shared. template shared_ptr(_Sp_alloc_shared_tag<_Alloc> __tag, _Args&&... __args) : __shared_ptr<_Tp>(__tag, std::forward<_Args>(__args)...) { } template friend shared_ptr<_Yp> allocate_shared(const _Alloc& __a, _Args&&... __args); // This constructor is non-standard, it is used by weak_ptr::lock(). shared_ptr(const weak_ptr<_Tp>& __r, std::nothrow_t) noexcept : __shared_ptr<_Tp>(__r, std::nothrow) { } friend class weak_ptr<_Tp>; }; #if __cpp_deduction_guides >= 201606 template shared_ptr(weak_ptr<_Tp>) -> shared_ptr<_Tp>; template shared_ptr(unique_ptr<_Tp, _Del>) -> shared_ptr<_Tp>; #endif // 20.7.2.2.7 shared_ptr comparisons /// @relates shared_ptr @{ /// Equality operator for shared_ptr objects, compares the stored pointers template _GLIBCXX_NODISCARD inline bool operator==(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { return __a.get() == __b.get(); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return !__a; } #ifdef __cpp_lib_three_way_comparison template inline strong_ordering operator<=>(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { return compare_three_way()(__a.get(), __b.get()); } template inline strong_ordering operator<=>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { using pointer = typename shared_ptr<_Tp>::element_type*; return compare_three_way()(__a.get(), static_cast(nullptr)); } #else /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return !__a; } /// Inequality operator for shared_ptr objects, compares the stored pointers template _GLIBCXX_NODISCARD inline bool operator!=(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { return __a.get() != __b.get(); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator!=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return (bool)__a; } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator!=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return (bool)__a; } /// Relational operator for shared_ptr objects, compares the stored pointers template _GLIBCXX_NODISCARD inline bool operator<(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { using _Tp_elt = typename shared_ptr<_Tp>::element_type; using _Up_elt = typename shared_ptr<_Up>::element_type; using _Vp = typename common_type<_Tp_elt*, _Up_elt*>::type; return less<_Vp>()(__a.get(), __b.get()); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { using _Tp_elt = typename shared_ptr<_Tp>::element_type; return less<_Tp_elt*>()(__a.get(), nullptr); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { using _Tp_elt = typename shared_ptr<_Tp>::element_type; return less<_Tp_elt*>()(nullptr, __a.get()); } /// Relational operator for shared_ptr objects, compares the stored pointers template _GLIBCXX_NODISCARD inline bool operator<=(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { return !(__b < __a); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return !(nullptr < __a); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator<=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return !(__a < nullptr); } /// Relational operator for shared_ptr objects, compares the stored pointers template _GLIBCXX_NODISCARD inline bool operator>(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { return (__b < __a); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return nullptr < __a; } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator>(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return __a < nullptr; } /// Relational operator for shared_ptr objects, compares the stored pointers template _GLIBCXX_NODISCARD inline bool operator>=(const shared_ptr<_Tp>& __a, const shared_ptr<_Up>& __b) noexcept { return !(__a < __b); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return !(__a < nullptr); } /// shared_ptr comparison with nullptr template _GLIBCXX_NODISCARD inline bool operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return !(nullptr < __a); } #endif // 20.7.2.2.8 shared_ptr specialized algorithms. /// Swap overload for shared_ptr template inline void swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b) noexcept { __a.swap(__b); } // 20.7.2.2.9 shared_ptr casts. /// Convert type of `shared_ptr`, via `static_cast` template inline shared_ptr<_Tp> static_pointer_cast(const shared_ptr<_Up>& __r) noexcept { using _Sp = shared_ptr<_Tp>; return _Sp(__r, static_cast(__r.get())); } /// Convert type of `shared_ptr`, via `const_cast` template inline shared_ptr<_Tp> const_pointer_cast(const shared_ptr<_Up>& __r) noexcept { using _Sp = shared_ptr<_Tp>; return _Sp(__r, const_cast(__r.get())); } /// Convert type of `shared_ptr`, via `dynamic_cast` template inline shared_ptr<_Tp> dynamic_pointer_cast(const shared_ptr<_Up>& __r) noexcept { using _Sp = shared_ptr<_Tp>; if (auto* __p = dynamic_cast(__r.get())) return _Sp(__r, __p); return _Sp(); } #if __cplusplus >= 201703L /// Convert type of `shared_ptr`, via `reinterpret_cast` template inline shared_ptr<_Tp> reinterpret_pointer_cast(const shared_ptr<_Up>& __r) noexcept { using _Sp = shared_ptr<_Tp>; return _Sp(__r, reinterpret_cast(__r.get())); } #if __cplusplus > 201703L // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2996. Missing rvalue overloads for shared_ptr operations /// Convert type of `shared_ptr` rvalue, via `static_cast` template inline shared_ptr<_Tp> static_pointer_cast(shared_ptr<_Up>&& __r) noexcept { using _Sp = shared_ptr<_Tp>; return _Sp(std::move(__r), static_cast(__r.get())); } /// Convert type of `shared_ptr` rvalue, via `const_cast` template inline shared_ptr<_Tp> const_pointer_cast(shared_ptr<_Up>&& __r) noexcept { using _Sp = shared_ptr<_Tp>; return _Sp(std::move(__r), const_cast(__r.get())); } /// Convert type of `shared_ptr` rvalue, via `dynamic_cast` template inline shared_ptr<_Tp> dynamic_pointer_cast(shared_ptr<_Up>&& __r) noexcept { using _Sp = shared_ptr<_Tp>; if (auto* __p = dynamic_cast(__r.get())) return _Sp(std::move(__r), __p); return _Sp(); } /// Convert type of `shared_ptr` rvalue, via `reinterpret_cast` template inline shared_ptr<_Tp> reinterpret_pointer_cast(shared_ptr<_Up>&& __r) noexcept { using _Sp = shared_ptr<_Tp>; return _Sp(std::move(__r), reinterpret_cast(__r.get())); } #endif // C++20 #endif // C++17 /// @} /** * @brief A non-owning observer for a pointer owned by a shared_ptr * * A weak_ptr provides a safe alternative to a raw pointer when you want * a non-owning reference to an object that is managed by a shared_ptr. * * Unlike a raw pointer, a weak_ptr can be converted to a new shared_ptr * that shares ownership with every other shared_ptr that already owns * the pointer. In other words you can upgrade from a non-owning "weak" * reference to an owning shared_ptr, without having access to any of * the existing shared_ptr objects. * * Also unlike a raw pointer, a weak_ptr does not become "dangling" after * the object it points to has been destroyed. Instead, a weak_ptr * becomes _expired_ and can no longer be converted to a shared_ptr that * owns the freed pointer, so you cannot accidentally access the pointed-to * object after it has been destroyed. */ template class weak_ptr : public __weak_ptr<_Tp> { template using _Constructible = typename enable_if< is_constructible<__weak_ptr<_Tp>, _Arg>::value >::type; template using _Assignable = typename enable_if< is_assignable<__weak_ptr<_Tp>&, _Arg>::value, weak_ptr& >::type; public: constexpr weak_ptr() noexcept = default; template&>> weak_ptr(const shared_ptr<_Yp>& __r) noexcept : __weak_ptr<_Tp>(__r) { } weak_ptr(const weak_ptr&) noexcept = default; template&>> weak_ptr(const weak_ptr<_Yp>& __r) noexcept : __weak_ptr<_Tp>(__r) { } weak_ptr(weak_ptr&&) noexcept = default; template>> weak_ptr(weak_ptr<_Yp>&& __r) noexcept : __weak_ptr<_Tp>(std::move(__r)) { } weak_ptr& operator=(const weak_ptr& __r) noexcept = default; template _Assignable&> operator=(const weak_ptr<_Yp>& __r) noexcept { this->__weak_ptr<_Tp>::operator=(__r); return *this; } template _Assignable&> operator=(const shared_ptr<_Yp>& __r) noexcept { this->__weak_ptr<_Tp>::operator=(__r); return *this; } weak_ptr& operator=(weak_ptr&& __r) noexcept = default; template _Assignable> operator=(weak_ptr<_Yp>&& __r) noexcept { this->__weak_ptr<_Tp>::operator=(std::move(__r)); return *this; } shared_ptr<_Tp> lock() const noexcept { return shared_ptr<_Tp>(*this, std::nothrow); } }; #if __cpp_deduction_guides >= 201606 template weak_ptr(shared_ptr<_Tp>) -> weak_ptr<_Tp>; #endif // 20.7.2.3.6 weak_ptr specialized algorithms. /// Swap overload for weak_ptr /// @relates weak_ptr template inline void swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) noexcept { __a.swap(__b); } /// Primary template owner_less template struct owner_less; /// Void specialization of owner_less compares either shared_ptr or weak_ptr template<> struct owner_less : _Sp_owner_less { }; /// Partial specialization of owner_less for shared_ptr. template struct owner_less> : public _Sp_owner_less, weak_ptr<_Tp>> { }; /// Partial specialization of owner_less for weak_ptr. template struct owner_less> : public _Sp_owner_less, shared_ptr<_Tp>> { }; /** * @brief Base class allowing use of member function shared_from_this. */ template class enable_shared_from_this { protected: constexpr enable_shared_from_this() noexcept { } enable_shared_from_this(const enable_shared_from_this&) noexcept { } enable_shared_from_this& operator=(const enable_shared_from_this&) noexcept { return *this; } ~enable_shared_from_this() { } public: shared_ptr<_Tp> shared_from_this() { return shared_ptr<_Tp>(this->_M_weak_this); } shared_ptr shared_from_this() const { return shared_ptr(this->_M_weak_this); } #if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11 #define __cpp_lib_enable_shared_from_this 201603 weak_ptr<_Tp> weak_from_this() noexcept { return this->_M_weak_this; } weak_ptr weak_from_this() const noexcept { return this->_M_weak_this; } #endif private: template void _M_weak_assign(_Tp1* __p, const __shared_count<>& __n) const noexcept { _M_weak_this._M_assign(__p, __n); } // Found by ADL when this is an associated class. friend const enable_shared_from_this* __enable_shared_from_this_base(const __shared_count<>&, const enable_shared_from_this* __p) { return __p; } template friend class __shared_ptr; mutable weak_ptr<_Tp> _M_weak_this; }; /// @relates shared_ptr @{ /** * @brief Create an object that is owned by a shared_ptr. * @param __a An allocator. * @param __args Arguments for the @a _Tp object's constructor. * @return A shared_ptr that owns the newly created object. * @throw An exception thrown from @a _Alloc::allocate or from the * constructor of @a _Tp. * * A copy of @a __a will be used to allocate memory for the shared_ptr * and the new object. */ template inline shared_ptr<_Tp> allocate_shared(const _Alloc& __a, _Args&&... __args) { static_assert(!is_array<_Tp>::value, "make_shared not supported"); return shared_ptr<_Tp>(_Sp_alloc_shared_tag<_Alloc>{__a}, std::forward<_Args>(__args)...); } /** * @brief Create an object that is owned by a shared_ptr. * @param __args Arguments for the @a _Tp object's constructor. * @return A shared_ptr that owns the newly created object. * @throw std::bad_alloc, or an exception thrown from the * constructor of @a _Tp. */ template inline shared_ptr<_Tp> make_shared(_Args&&... __args) { typedef typename std::remove_cv<_Tp>::type _Tp_nc; return std::allocate_shared<_Tp>(std::allocator<_Tp_nc>(), std::forward<_Args>(__args)...); } /// std::hash specialization for shared_ptr. template struct hash> : public __hash_base> { size_t operator()(const shared_ptr<_Tp>& __s) const noexcept { return std::hash::element_type*>()(__s.get()); } }; /// @} relates shared_ptr /// @} group pointer_abstractions #if __cplusplus >= 201703L namespace __detail::__variant { template struct _Never_valueless_alt; // see // Provide the strong exception-safety guarantee when emplacing a // shared_ptr into a variant. template struct _Never_valueless_alt> : std::true_type { }; // Provide the strong exception-safety guarantee when emplacing a // weak_ptr into a variant. template struct _Never_valueless_alt> : std::true_type { }; } // namespace __detail::__variant #endif // C++17 _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif // _SHARED_PTR_H