// Experimental shared_ptr with array support -*- C++ -*- // Copyright (C) 2015-2017 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 experimental/bits/shared_ptr.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{experimental/memory} */ #ifndef _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H #define _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H 1 #pragma GCC system_header #if __cplusplus >= 201402L #include #include namespace std _GLIBCXX_VISIBILITY(default) { namespace experimental { inline namespace fundamentals_v2 { _GLIBCXX_BEGIN_NAMESPACE_VERSION // 8.2.1 template class shared_ptr; template class weak_ptr; template class enable_shared_from_this; template constexpr bool __sp_compatible_v = std::__sp_compatible_with<_Yp*, _Tp*>::value; template constexpr bool __sp_is_constructible_v = std::__sp_is_constructible<_Tp, _Yp>::value; template class shared_ptr : public __shared_ptr<_Tp> { using _Base_type = __shared_ptr<_Tp>; public: using element_type = typename _Base_type::element_type; private: // Constraint for construction from a pointer of type _Yp*: template using _SafeConv = enable_if_t<__sp_is_constructible_v<_Tp, _Yp>>; template using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; template::pointer, typename _Res = void> using _UniqCompatible = enable_if_t< __sp_compatible_v<_Tp1, _Tp> && experimental::is_convertible_v<_Ptr, element_type*>, _Res>; public: // 8.2.1.1, shared_ptr constructors constexpr shared_ptr() noexcept = default; template> explicit shared_ptr(_Tp1* __p) : _Base_type(__p) { _M_enable_shared_from_this_with(__p); } template> shared_ptr(_Tp1* __p, _Deleter __d) : _Base_type(__p, __d) { _M_enable_shared_from_this_with(__p); } template> shared_ptr(_Tp1* __p, _Deleter __d, _Alloc __a) : _Base_type(__p, __d, __a) { _M_enable_shared_from_this_with(__p); } template shared_ptr(nullptr_t __p, _Deleter __d) : _Base_type(__p, __d) { } template shared_ptr(nullptr_t __p, _Deleter __d, _Alloc __a) : _Base_type(__p, __d, __a) { } template shared_ptr(const shared_ptr<_Tp1>& __r, element_type* __p) noexcept : _Base_type(__r, __p) { } shared_ptr(const shared_ptr& __r) noexcept : _Base_type(__r) { } template> shared_ptr(const shared_ptr<_Tp1>& __r) noexcept : _Base_type(__r) { } shared_ptr(shared_ptr&& __r) noexcept : _Base_type(std::move(__r)) { } template> shared_ptr(shared_ptr<_Tp1>&& __r) noexcept : _Base_type(std::move(__r)) { } template> explicit shared_ptr(const weak_ptr<_Tp1>& __r) : _Base_type(__r) { } #if _GLIBCXX_USE_DEPRECATED template> shared_ptr(std::auto_ptr<_Tp1>&& __r) : _Base_type(std::move(__r)) { _M_enable_shared_from_this_with(static_cast<_Tp1*>(this->get())); } #endif template> shared_ptr(unique_ptr<_Tp1, _Del>&& __r) : _Base_type(std::move(__r)) { // XXX assume conversion from __r.get() to this->get() to __elem_t* // is a round trip, which might not be true in all cases. using __elem_t = typename unique_ptr<_Tp1, _Del>::element_type; _M_enable_shared_from_this_with(static_cast<__elem_t*>(this->get())); } constexpr shared_ptr(nullptr_t __p) : _Base_type(__p) { } // C++14 §20.8.2.2 ~shared_ptr() = default; // C++14 §20.8.2.3 shared_ptr& operator=(const shared_ptr&) noexcept = default; template _Compatible<_Tp1, shared_ptr&> operator=(const shared_ptr<_Tp1>& __r) noexcept { _Base_type::operator=(__r); return *this; } shared_ptr& operator=(shared_ptr&& __r) noexcept { _Base_type::operator=(std::move(__r)); return *this; } template _Compatible<_Tp1, shared_ptr&> operator=(shared_ptr<_Tp1>&& __r) noexcept { _Base_type::operator=(std::move(__r)); return *this; } #if _GLIBCXX_USE_DEPRECATED template _Compatible<_Tp1, shared_ptr&> operator=(std::auto_ptr<_Tp1>&& __r) { __shared_ptr<_Tp>::operator=(std::move(__r)); return *this; } #endif template _UniqCompatible<_Tp1, _Del, shared_ptr&> operator=(unique_ptr<_Tp1, _Del>&& __r) { _Base_type::operator=(std::move(__r)); return *this; } // C++14 §20.8.2.2.4 // swap & reset // 8.2.1.2 shared_ptr observers // in __shared_ptr private: template shared_ptr(_Sp_make_shared_tag __tag, const _Alloc& __a, _Args&&... __args) : _Base_type(__tag, __a, std::forward<_Args>(__args)...) { _M_enable_shared_from_this_with(this->get()); } template friend shared_ptr<_Tp1> allocate_shared(const _Alloc& __a, _Args&&... __args); shared_ptr(const weak_ptr<_Tp>& __r, std::nothrow_t) : _Base_type(__r, std::nothrow) { } friend class weak_ptr<_Tp>; template using __esft_base_t = decltype(__expt_enable_shared_from_this_base(std::declval<_Yp*>())); // Detect an accessible and unambiguous enable_shared_from_this base. template struct __has_esft_base : false_type { }; template struct __has_esft_base<_Yp, __void_t<__esft_base_t<_Yp>>> : __bool_constant> { }; // ignore base for arrays template typename enable_if<__has_esft_base<_Yp>::value>::type _M_enable_shared_from_this_with(const _Yp* __p) noexcept { if (auto __base = __expt_enable_shared_from_this_base(__p)) { __base->_M_weak_this = shared_ptr<_Yp>(*this, const_cast<_Yp*>(__p)); } } template typename enable_if::value>::type _M_enable_shared_from_this_with(const _Yp*) noexcept { } }; // C++14 §20.8.2.2.7 //DOING template bool operator==(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) noexcept { return __a.get() == __b.get(); } template inline bool operator==(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return !__a; } template inline bool operator==(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return !__a; } template inline bool operator!=(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) noexcept { return __a.get() != __b.get(); } template inline bool operator!=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return (bool)__a; } template inline bool operator!=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return (bool)__a; } template inline bool operator<(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) noexcept { using __elem_t1 = typename shared_ptr<_Tp1>::element_type; using __elem_t2 = typename shared_ptr<_Tp2>::element_type; using _CT = common_type_t<__elem_t1*, __elem_t2*>; return std::less<_CT>()(__a.get(), __b.get()); } template inline bool operator<(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return std::less<__elem_t*>()(__a.get(), nullptr); } template inline bool operator<(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return std::less<__elem_t*>()(nullptr, __a.get()); } template inline bool operator<=(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) noexcept { return !(__b < __a); } template inline bool operator<=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return !(nullptr < __a); } template inline bool operator<=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return !(__a < nullptr); } template inline bool operator>(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) noexcept { return (__b < __a); } template inline bool operator>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return std::less<__elem_t*>()(nullptr, __a.get()); } template inline bool operator>(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return std::less<__elem_t*>()(__a.get(), nullptr); } template inline bool operator>=(const shared_ptr<_Tp1>& __a, const shared_ptr<_Tp2>& __b) noexcept { return !(__a < __b); } template inline bool operator>=(const shared_ptr<_Tp>& __a, nullptr_t) noexcept { return !(__a < nullptr); } template inline bool operator>=(nullptr_t, const shared_ptr<_Tp>& __a) noexcept { return !(nullptr < __a); } // C++14 §20.8.2.2.8 template inline void swap(shared_ptr<_Tp>& __a, shared_ptr<_Tp>& __b) noexcept { __a.swap(__b); } // 8.2.1.3, shared_ptr casts template inline shared_ptr<_Tp> static_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return shared_ptr<_Tp>(__r, static_cast<__elem_t*>(__r.get())); } template inline shared_ptr<_Tp> dynamic_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; if (_Tp* __p = dynamic_cast<__elem_t*>(__r.get())) return shared_ptr<_Tp>(__r, __p); return shared_ptr<_Tp>(); } template inline shared_ptr<_Tp> const_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return shared_ptr<_Tp>(__r, const_cast<__elem_t*>(__r.get())); } template inline shared_ptr<_Tp> reinterpret_pointer_cast(const shared_ptr<_Tp1>& __r) noexcept { using __elem_t = typename shared_ptr<_Tp>::element_type; return shared_ptr<_Tp>(__r, reinterpret_cast<__elem_t*>(__r.get())); } // C++14 §20.8.2.3 template class weak_ptr : public __weak_ptr<_Tp> { template using _Compatible = enable_if_t<__sp_compatible_v<_Tp1, _Tp>, _Res>; using _Base_type = __weak_ptr<_Tp>; public: constexpr weak_ptr() noexcept = default; template> weak_ptr(const shared_ptr<_Tp1>& __r) noexcept : _Base_type(__r) { } weak_ptr(const weak_ptr&) noexcept = default; template> weak_ptr(const weak_ptr<_Tp1>& __r) noexcept : _Base_type(__r) { } weak_ptr(weak_ptr&&) noexcept = default; template> weak_ptr(weak_ptr<_Tp1>&& __r) noexcept : _Base_type(std::move(__r)) { } weak_ptr& operator=(const weak_ptr& __r) noexcept = default; template _Compatible<_Tp1, weak_ptr&> operator=(const weak_ptr<_Tp1>& __r) noexcept { this->_Base_type::operator=(__r); return *this; } template _Compatible<_Tp1, weak_ptr&> operator=(const shared_ptr<_Tp1>& __r) noexcept { this->_Base_type::operator=(__r); return *this; } weak_ptr& operator=(weak_ptr&& __r) noexcept = default; template _Compatible<_Tp1, weak_ptr&> operator=(weak_ptr<_Tp1>&& __r) noexcept { this->_Base_type::operator=(std::move(__r)); return *this; } shared_ptr<_Tp> lock() const noexcept { return shared_ptr<_Tp>(*this, std::nothrow); } friend class enable_shared_from_this<_Tp>; }; // C++14 §20.8.2.3.6 template inline void swap(weak_ptr<_Tp>& __a, weak_ptr<_Tp>& __b) noexcept { __a.swap(__b); } /// C++14 §20.8.2.2.10 template inline _Del* get_deleter(const shared_ptr<_Tp>& __p) noexcept { return std::get_deleter<_Del>(__p); } // C++14 §20.8.2.2.11 template inline std::basic_ostream<_Ch, _Tr>& operator<<(std::basic_ostream<_Ch, _Tr>& __os, const shared_ptr<_Tp>& __p) { __os << __p.get(); return __os; } // C++14 §20.8.2.4 template class 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>> { }; template<> class owner_less { template bool operator()(shared_ptr<_Tp> const& __lhs, shared_ptr<_Up> const& __rhs) const { return __lhs.owner_before(__rhs); } template bool operator()(shared_ptr<_Tp> const& __lhs, weak_ptr<_Up> const& __rhs) const { return __lhs.owner_before(__rhs); } template bool operator()(weak_ptr<_Tp> const& __lhs, shared_ptr<_Up> const& __rhs) const { return __lhs.owner_before(__rhs); } template bool operator()(weak_ptr<_Tp> const& __lhs, weak_ptr<_Up> const& __rhs) const { return __lhs.owner_before(__rhs); } typedef void is_transparent; }; // C++14 §20.8.2.6 template inline bool atomic_is_lock_free(const shared_ptr<_Tp>* __p) { return std::atomic_is_lock_free<_Tp, __default_lock_policy>(__p); } template shared_ptr<_Tp> atomic_load(const shared_ptr<_Tp>* __p) { return std::atomic_load<_Tp>(__p); } template shared_ptr<_Tp> atomic_load_explicit(const shared_ptr<_Tp>* __p, memory_order __mo) { return std::atomic_load_explicit<_Tp>(__p, __mo); } template void atomic_store(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) { return std::atomic_store<_Tp>(__p, __r); } template shared_ptr<_Tp> atomic_store_explicit(const shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r, memory_order __mo) { return std::atomic_store_explicit<_Tp>(__p, __r, __mo); } template void atomic_exchange(shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r) { return std::atomic_exchange<_Tp>(__p, __r); } template shared_ptr<_Tp> atomic_exchange_explicit(const shared_ptr<_Tp>* __p, shared_ptr<_Tp> __r, memory_order __mo) { return std::atomic_exchange_explicit<_Tp>(__p, __r, __mo); } template bool atomic_compare_exchange_weak(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w) { return std::atomic_compare_exchange_weak<_Tp>(__p, __v, __w); } template bool atomic_compare_exchange_strong(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w) { return std::atomic_compare_exchange_strong<_Tp>(__p, __v, __w); } template bool atomic_compare_exchange_weak_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w, memory_order __success, memory_order __failure) { return std::atomic_compare_exchange_weak_explicit<_Tp>(__p, __v, __w, __success, __failure); } template bool atomic_compare_exchange_strong_explicit(shared_ptr<_Tp>* __p, shared_ptr<_Tp>* __v, shared_ptr<_Tp> __w, memory_order __success, memory_order __failure) { return std::atomic_compare_exchange_strong_explicit<_Tp>(__p, __v, __w, __success, __failure); } //enable_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); } weak_ptr<_Tp> weak_from_this() noexcept { return _M_weak_this; } weak_ptr weak_from_this() const noexcept { return _M_weak_this; } 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* __expt_enable_shared_from_this_base(const enable_shared_from_this* __p) { return __p; } template friend class shared_ptr; mutable weak_ptr<_Tp> _M_weak_this; }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace fundamentals_v2 } // namespace experimental _GLIBCXX_BEGIN_NAMESPACE_VERSION /// std::hash specialization for shared_ptr. template struct hash> : public __hash_base> { size_t operator()(const experimental::shared_ptr<_Tp>& __s) const noexcept { return std::hash<_Tp*>()(__s.get()); } }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // __cplusplus <= 201103L #endif // _GLIBCXX_EXPERIMENTAL_SHARED_PTR_H