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1032 lines
32 KiB
1032 lines
32 KiB
3 years ago
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// unique_ptr implementation -*- C++ -*-
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// Copyright (C) 2008-2021 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file bits/unique_ptr.h
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* This is an internal header file, included by other library headers.
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* Do not attempt to use it directly. @headername{memory}
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*/
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#ifndef _UNIQUE_PTR_H
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#define _UNIQUE_PTR_H 1
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#include <bits/c++config.h>
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#include <debug/assertions.h>
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#include <type_traits>
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#include <utility>
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#include <tuple>
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#include <bits/stl_function.h>
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#include <bits/functional_hash.h>
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#if __cplusplus > 201703L
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# include <compare>
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# include <ostream>
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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/**
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* @addtogroup pointer_abstractions
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* @{
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*/
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#if _GLIBCXX_USE_DEPRECATED
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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template<typename> class auto_ptr;
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#pragma GCC diagnostic pop
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#endif
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/// Primary template of default_delete, used by unique_ptr for single objects
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template<typename _Tp>
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struct default_delete
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{
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/// Default constructor
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constexpr default_delete() noexcept = default;
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/** @brief Converting constructor.
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*
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* Allows conversion from a deleter for objects of another type, `_Up`,
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* only if `_Up*` is convertible to `_Tp*`.
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*/
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template<typename _Up,
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typename = _Require<is_convertible<_Up*, _Tp*>>>
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default_delete(const default_delete<_Up>&) noexcept { }
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/// Calls `delete __ptr`
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void
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operator()(_Tp* __ptr) const
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{
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static_assert(!is_void<_Tp>::value,
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"can't delete pointer to incomplete type");
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static_assert(sizeof(_Tp)>0,
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"can't delete pointer to incomplete type");
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delete __ptr;
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}
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};
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// _GLIBCXX_RESOLVE_LIB_DEFECTS
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// DR 740 - omit specialization for array objects with a compile time length
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/// Specialization of default_delete for arrays, used by `unique_ptr<T[]>`
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template<typename _Tp>
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struct default_delete<_Tp[]>
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{
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public:
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/// Default constructor
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constexpr default_delete() noexcept = default;
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/** @brief Converting constructor.
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*
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* Allows conversion from a deleter for arrays of another type, such as
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* a const-qualified version of `_Tp`.
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*
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* Conversions from types derived from `_Tp` are not allowed because
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* it is undefined to `delete[]` an array of derived types through a
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* pointer to the base type.
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*/
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template<typename _Up,
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typename = _Require<is_convertible<_Up(*)[], _Tp(*)[]>>>
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default_delete(const default_delete<_Up[]>&) noexcept { }
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/// Calls `delete[] __ptr`
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template<typename _Up>
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typename enable_if<is_convertible<_Up(*)[], _Tp(*)[]>::value>::type
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operator()(_Up* __ptr) const
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{
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static_assert(sizeof(_Tp)>0,
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"can't delete pointer to incomplete type");
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delete [] __ptr;
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}
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};
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/// @cond undocumented
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// Manages the pointer and deleter of a unique_ptr
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template <typename _Tp, typename _Dp>
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class __uniq_ptr_impl
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{
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template <typename _Up, typename _Ep, typename = void>
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struct _Ptr
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{
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using type = _Up*;
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};
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template <typename _Up, typename _Ep>
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struct
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_Ptr<_Up, _Ep, __void_t<typename remove_reference<_Ep>::type::pointer>>
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{
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using type = typename remove_reference<_Ep>::type::pointer;
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};
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public:
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using _DeleterConstraint = enable_if<
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__and_<__not_<is_pointer<_Dp>>,
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is_default_constructible<_Dp>>::value>;
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using pointer = typename _Ptr<_Tp, _Dp>::type;
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static_assert( !is_rvalue_reference<_Dp>::value,
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"unique_ptr's deleter type must be a function object type"
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" or an lvalue reference type" );
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__uniq_ptr_impl() = default;
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__uniq_ptr_impl(pointer __p) : _M_t() { _M_ptr() = __p; }
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template<typename _Del>
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__uniq_ptr_impl(pointer __p, _Del&& __d)
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: _M_t(__p, std::forward<_Del>(__d)) { }
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__uniq_ptr_impl(__uniq_ptr_impl&& __u) noexcept
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: _M_t(std::move(__u._M_t))
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{ __u._M_ptr() = nullptr; }
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__uniq_ptr_impl& operator=(__uniq_ptr_impl&& __u) noexcept
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{
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reset(__u.release());
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_M_deleter() = std::forward<_Dp>(__u._M_deleter());
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return *this;
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}
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pointer& _M_ptr() { return std::get<0>(_M_t); }
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pointer _M_ptr() const { return std::get<0>(_M_t); }
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_Dp& _M_deleter() { return std::get<1>(_M_t); }
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const _Dp& _M_deleter() const { return std::get<1>(_M_t); }
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void reset(pointer __p) noexcept
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{
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const pointer __old_p = _M_ptr();
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_M_ptr() = __p;
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if (__old_p)
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_M_deleter()(__old_p);
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}
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pointer release() noexcept
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{
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pointer __p = _M_ptr();
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_M_ptr() = nullptr;
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return __p;
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}
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void
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swap(__uniq_ptr_impl& __rhs) noexcept
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{
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using std::swap;
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swap(this->_M_ptr(), __rhs._M_ptr());
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swap(this->_M_deleter(), __rhs._M_deleter());
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}
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private:
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tuple<pointer, _Dp> _M_t;
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};
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// Defines move construction + assignment as either defaulted or deleted.
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template <typename _Tp, typename _Dp,
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bool = is_move_constructible<_Dp>::value,
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bool = is_move_assignable<_Dp>::value>
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struct __uniq_ptr_data : __uniq_ptr_impl<_Tp, _Dp>
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{
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using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
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__uniq_ptr_data(__uniq_ptr_data&&) = default;
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__uniq_ptr_data& operator=(__uniq_ptr_data&&) = default;
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};
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template <typename _Tp, typename _Dp>
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struct __uniq_ptr_data<_Tp, _Dp, true, false> : __uniq_ptr_impl<_Tp, _Dp>
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{
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using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
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__uniq_ptr_data(__uniq_ptr_data&&) = default;
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__uniq_ptr_data& operator=(__uniq_ptr_data&&) = delete;
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};
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template <typename _Tp, typename _Dp>
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struct __uniq_ptr_data<_Tp, _Dp, false, true> : __uniq_ptr_impl<_Tp, _Dp>
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{
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using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
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__uniq_ptr_data(__uniq_ptr_data&&) = delete;
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__uniq_ptr_data& operator=(__uniq_ptr_data&&) = default;
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};
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template <typename _Tp, typename _Dp>
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struct __uniq_ptr_data<_Tp, _Dp, false, false> : __uniq_ptr_impl<_Tp, _Dp>
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{
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using __uniq_ptr_impl<_Tp, _Dp>::__uniq_ptr_impl;
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__uniq_ptr_data(__uniq_ptr_data&&) = delete;
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__uniq_ptr_data& operator=(__uniq_ptr_data&&) = delete;
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};
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/// @endcond
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/// 20.7.1.2 unique_ptr for single objects.
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template <typename _Tp, typename _Dp = default_delete<_Tp>>
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class unique_ptr
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{
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template <typename _Up>
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using _DeleterConstraint =
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typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type;
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__uniq_ptr_data<_Tp, _Dp> _M_t;
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public:
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using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer;
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using element_type = _Tp;
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using deleter_type = _Dp;
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private:
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// helper template for detecting a safe conversion from another
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// unique_ptr
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template<typename _Up, typename _Ep>
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using __safe_conversion_up = __and_<
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is_convertible<typename unique_ptr<_Up, _Ep>::pointer, pointer>,
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__not_<is_array<_Up>>
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>;
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public:
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// Constructors.
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/// Default constructor, creates a unique_ptr that owns nothing.
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template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>>
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constexpr unique_ptr() noexcept
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: _M_t()
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{ }
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/** Takes ownership of a pointer.
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*
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* @param __p A pointer to an object of @c element_type
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*
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* The deleter will be value-initialized.
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*/
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template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>>
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explicit
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unique_ptr(pointer __p) noexcept
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: _M_t(__p)
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{ }
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/** Takes ownership of a pointer.
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*
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* @param __p A pointer to an object of @c element_type
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* @param __d A reference to a deleter.
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*
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* The deleter will be initialized with @p __d
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*/
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template<typename _Del = deleter_type,
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typename = _Require<is_copy_constructible<_Del>>>
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unique_ptr(pointer __p, const deleter_type& __d) noexcept
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: _M_t(__p, __d) { }
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/** Takes ownership of a pointer.
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*
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* @param __p A pointer to an object of @c element_type
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* @param __d An rvalue reference to a (non-reference) deleter.
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*
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* The deleter will be initialized with @p std::move(__d)
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||
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*/
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||
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template<typename _Del = deleter_type,
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typename = _Require<is_move_constructible<_Del>>>
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||
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unique_ptr(pointer __p,
|
||
|
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__enable_if_t<!is_lvalue_reference<_Del>::value,
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||
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_Del&&> __d) noexcept
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: _M_t(__p, std::move(__d))
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{ }
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template<typename _Del = deleter_type,
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typename _DelUnref = typename remove_reference<_Del>::type>
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||
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unique_ptr(pointer,
|
||
|
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__enable_if_t<is_lvalue_reference<_Del>::value,
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||
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_DelUnref&&>) = delete;
|
||
|
|
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||
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/// Creates a unique_ptr that owns nothing.
|
||
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template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>>
|
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constexpr unique_ptr(nullptr_t) noexcept
|
||
|
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: _M_t()
|
||
|
|
{ }
|
||
|
|
|
||
|
|
// Move constructors.
|
||
|
|
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||
|
|
/// Move constructor.
|
||
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|
unique_ptr(unique_ptr&&) = default;
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||
|
|
|
||
|
|
/** @brief Converting constructor from another type
|
||
|
|
*
|
||
|
|
* Requires that the pointer owned by @p __u is convertible to the
|
||
|
|
* type of pointer owned by this object, @p __u does not own an array,
|
||
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|
* and @p __u has a compatible deleter type.
|
||
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|
*/
|
||
|
|
template<typename _Up, typename _Ep, typename = _Require<
|
||
|
|
__safe_conversion_up<_Up, _Ep>,
|
||
|
|
typename conditional<is_reference<_Dp>::value,
|
||
|
|
is_same<_Ep, _Dp>,
|
||
|
|
is_convertible<_Ep, _Dp>>::type>>
|
||
|
|
unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
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||
|
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: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
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||
|
|
{ }
|
||
|
|
|
||
|
|
#if _GLIBCXX_USE_DEPRECATED
|
||
|
|
#pragma GCC diagnostic push
|
||
|
|
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
|
||
|
|
/// Converting constructor from @c auto_ptr
|
||
|
|
template<typename _Up, typename = _Require<
|
||
|
|
is_convertible<_Up*, _Tp*>, is_same<_Dp, default_delete<_Tp>>>>
|
||
|
|
unique_ptr(auto_ptr<_Up>&& __u) noexcept;
|
||
|
|
#pragma GCC diagnostic pop
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/// Destructor, invokes the deleter if the stored pointer is not null.
|
||
|
|
~unique_ptr() noexcept
|
||
|
|
{
|
||
|
|
static_assert(__is_invocable<deleter_type&, pointer>::value,
|
||
|
|
"unique_ptr's deleter must be invocable with a pointer");
|
||
|
|
auto& __ptr = _M_t._M_ptr();
|
||
|
|
if (__ptr != nullptr)
|
||
|
|
get_deleter()(std::move(__ptr));
|
||
|
|
__ptr = pointer();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Assignment.
|
||
|
|
|
||
|
|
/** @brief Move assignment operator.
|
||
|
|
*
|
||
|
|
* Invokes the deleter if this object owns a pointer.
|
||
|
|
*/
|
||
|
|
unique_ptr& operator=(unique_ptr&&) = default;
|
||
|
|
|
||
|
|
/** @brief Assignment from another type.
|
||
|
|
*
|
||
|
|
* @param __u The object to transfer ownership from, which owns a
|
||
|
|
* convertible pointer to a non-array object.
|
||
|
|
*
|
||
|
|
* Invokes the deleter if this object owns a pointer.
|
||
|
|
*/
|
||
|
|
template<typename _Up, typename _Ep>
|
||
|
|
typename enable_if< __and_<
|
||
|
|
__safe_conversion_up<_Up, _Ep>,
|
||
|
|
is_assignable<deleter_type&, _Ep&&>
|
||
|
|
>::value,
|
||
|
|
unique_ptr&>::type
|
||
|
|
operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
|
||
|
|
{
|
||
|
|
reset(__u.release());
|
||
|
|
get_deleter() = std::forward<_Ep>(__u.get_deleter());
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Reset the %unique_ptr to empty, invoking the deleter if necessary.
|
||
|
|
unique_ptr&
|
||
|
|
operator=(nullptr_t) noexcept
|
||
|
|
{
|
||
|
|
reset();
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Observers.
|
||
|
|
|
||
|
|
/// Dereference the stored pointer.
|
||
|
|
typename add_lvalue_reference<element_type>::type
|
||
|
|
operator*() const
|
||
|
|
{
|
||
|
|
__glibcxx_assert(get() != pointer());
|
||
|
|
return *get();
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return the stored pointer.
|
||
|
|
pointer
|
||
|
|
operator->() const noexcept
|
||
|
|
{
|
||
|
|
_GLIBCXX_DEBUG_PEDASSERT(get() != pointer());
|
||
|
|
return get();
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return the stored pointer.
|
||
|
|
pointer
|
||
|
|
get() const noexcept
|
||
|
|
{ return _M_t._M_ptr(); }
|
||
|
|
|
||
|
|
/// Return a reference to the stored deleter.
|
||
|
|
deleter_type&
|
||
|
|
get_deleter() noexcept
|
||
|
|
{ return _M_t._M_deleter(); }
|
||
|
|
|
||
|
|
/// Return a reference to the stored deleter.
|
||
|
|
const deleter_type&
|
||
|
|
get_deleter() const noexcept
|
||
|
|
{ return _M_t._M_deleter(); }
|
||
|
|
|
||
|
|
/// Return @c true if the stored pointer is not null.
|
||
|
|
explicit operator bool() const noexcept
|
||
|
|
{ return get() == pointer() ? false : true; }
|
||
|
|
|
||
|
|
// Modifiers.
|
||
|
|
|
||
|
|
/// Release ownership of any stored pointer.
|
||
|
|
pointer
|
||
|
|
release() noexcept
|
||
|
|
{ return _M_t.release(); }
|
||
|
|
|
||
|
|
/** @brief Replace the stored pointer.
|
||
|
|
*
|
||
|
|
* @param __p The new pointer to store.
|
||
|
|
*
|
||
|
|
* The deleter will be invoked if a pointer is already owned.
|
||
|
|
*/
|
||
|
|
void
|
||
|
|
reset(pointer __p = pointer()) noexcept
|
||
|
|
{
|
||
|
|
static_assert(__is_invocable<deleter_type&, pointer>::value,
|
||
|
|
"unique_ptr's deleter must be invocable with a pointer");
|
||
|
|
_M_t.reset(std::move(__p));
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Exchange the pointer and deleter with another object.
|
||
|
|
void
|
||
|
|
swap(unique_ptr& __u) noexcept
|
||
|
|
{
|
||
|
|
static_assert(__is_swappable<_Dp>::value, "deleter must be swappable");
|
||
|
|
_M_t.swap(__u._M_t);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Disable copy from lvalue.
|
||
|
|
unique_ptr(const unique_ptr&) = delete;
|
||
|
|
unique_ptr& operator=(const unique_ptr&) = delete;
|
||
|
|
};
|
||
|
|
|
||
|
|
/// 20.7.1.3 unique_ptr for array objects with a runtime length
|
||
|
|
// [unique.ptr.runtime]
|
||
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
||
|
|
// DR 740 - omit specialization for array objects with a compile time length
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
class unique_ptr<_Tp[], _Dp>
|
||
|
|
{
|
||
|
|
template <typename _Up>
|
||
|
|
using _DeleterConstraint =
|
||
|
|
typename __uniq_ptr_impl<_Tp, _Up>::_DeleterConstraint::type;
|
||
|
|
|
||
|
|
__uniq_ptr_data<_Tp, _Dp> _M_t;
|
||
|
|
|
||
|
|
template<typename _Up>
|
||
|
|
using __remove_cv = typename remove_cv<_Up>::type;
|
||
|
|
|
||
|
|
// like is_base_of<_Tp, _Up> but false if unqualified types are the same
|
||
|
|
template<typename _Up>
|
||
|
|
using __is_derived_Tp
|
||
|
|
= __and_< is_base_of<_Tp, _Up>,
|
||
|
|
__not_<is_same<__remove_cv<_Tp>, __remove_cv<_Up>>> >;
|
||
|
|
|
||
|
|
public:
|
||
|
|
using pointer = typename __uniq_ptr_impl<_Tp, _Dp>::pointer;
|
||
|
|
using element_type = _Tp;
|
||
|
|
using deleter_type = _Dp;
|
||
|
|
|
||
|
|
// helper template for detecting a safe conversion from another
|
||
|
|
// unique_ptr
|
||
|
|
template<typename _Up, typename _Ep,
|
||
|
|
typename _UPtr = unique_ptr<_Up, _Ep>,
|
||
|
|
typename _UP_pointer = typename _UPtr::pointer,
|
||
|
|
typename _UP_element_type = typename _UPtr::element_type>
|
||
|
|
using __safe_conversion_up = __and_<
|
||
|
|
is_array<_Up>,
|
||
|
|
is_same<pointer, element_type*>,
|
||
|
|
is_same<_UP_pointer, _UP_element_type*>,
|
||
|
|
is_convertible<_UP_element_type(*)[], element_type(*)[]>
|
||
|
|
>;
|
||
|
|
|
||
|
|
// helper template for detecting a safe conversion from a raw pointer
|
||
|
|
template<typename _Up>
|
||
|
|
using __safe_conversion_raw = __and_<
|
||
|
|
__or_<__or_<is_same<_Up, pointer>,
|
||
|
|
is_same<_Up, nullptr_t>>,
|
||
|
|
__and_<is_pointer<_Up>,
|
||
|
|
is_same<pointer, element_type*>,
|
||
|
|
is_convertible<
|
||
|
|
typename remove_pointer<_Up>::type(*)[],
|
||
|
|
element_type(*)[]>
|
||
|
|
>
|
||
|
|
>
|
||
|
|
>;
|
||
|
|
|
||
|
|
// Constructors.
|
||
|
|
|
||
|
|
/// Default constructor, creates a unique_ptr that owns nothing.
|
||
|
|
template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>>
|
||
|
|
constexpr unique_ptr() noexcept
|
||
|
|
: _M_t()
|
||
|
|
{ }
|
||
|
|
|
||
|
|
/** Takes ownership of a pointer.
|
||
|
|
*
|
||
|
|
* @param __p A pointer to an array of a type safely convertible
|
||
|
|
* to an array of @c element_type
|
||
|
|
*
|
||
|
|
* The deleter will be value-initialized.
|
||
|
|
*/
|
||
|
|
template<typename _Up,
|
||
|
|
typename _Vp = _Dp,
|
||
|
|
typename = _DeleterConstraint<_Vp>,
|
||
|
|
typename = typename enable_if<
|
||
|
|
__safe_conversion_raw<_Up>::value, bool>::type>
|
||
|
|
explicit
|
||
|
|
unique_ptr(_Up __p) noexcept
|
||
|
|
: _M_t(__p)
|
||
|
|
{ }
|
||
|
|
|
||
|
|
/** Takes ownership of a pointer.
|
||
|
|
*
|
||
|
|
* @param __p A pointer to an array of a type safely convertible
|
||
|
|
* to an array of @c element_type
|
||
|
|
* @param __d A reference to a deleter.
|
||
|
|
*
|
||
|
|
* The deleter will be initialized with @p __d
|
||
|
|
*/
|
||
|
|
template<typename _Up, typename _Del = deleter_type,
|
||
|
|
typename = _Require<__safe_conversion_raw<_Up>,
|
||
|
|
is_copy_constructible<_Del>>>
|
||
|
|
unique_ptr(_Up __p, const deleter_type& __d) noexcept
|
||
|
|
: _M_t(__p, __d) { }
|
||
|
|
|
||
|
|
/** Takes ownership of a pointer.
|
||
|
|
*
|
||
|
|
* @param __p A pointer to an array of a type safely convertible
|
||
|
|
* to an array of @c element_type
|
||
|
|
* @param __d A reference to a deleter.
|
||
|
|
*
|
||
|
|
* The deleter will be initialized with @p std::move(__d)
|
||
|
|
*/
|
||
|
|
template<typename _Up, typename _Del = deleter_type,
|
||
|
|
typename = _Require<__safe_conversion_raw<_Up>,
|
||
|
|
is_move_constructible<_Del>>>
|
||
|
|
unique_ptr(_Up __p,
|
||
|
|
__enable_if_t<!is_lvalue_reference<_Del>::value,
|
||
|
|
_Del&&> __d) noexcept
|
||
|
|
: _M_t(std::move(__p), std::move(__d))
|
||
|
|
{ }
|
||
|
|
|
||
|
|
template<typename _Up, typename _Del = deleter_type,
|
||
|
|
typename _DelUnref = typename remove_reference<_Del>::type,
|
||
|
|
typename = _Require<__safe_conversion_raw<_Up>>>
|
||
|
|
unique_ptr(_Up,
|
||
|
|
__enable_if_t<is_lvalue_reference<_Del>::value,
|
||
|
|
_DelUnref&&>) = delete;
|
||
|
|
|
||
|
|
/// Move constructor.
|
||
|
|
unique_ptr(unique_ptr&&) = default;
|
||
|
|
|
||
|
|
/// Creates a unique_ptr that owns nothing.
|
||
|
|
template<typename _Del = _Dp, typename = _DeleterConstraint<_Del>>
|
||
|
|
constexpr unique_ptr(nullptr_t) noexcept
|
||
|
|
: _M_t()
|
||
|
|
{ }
|
||
|
|
|
||
|
|
template<typename _Up, typename _Ep, typename = _Require<
|
||
|
|
__safe_conversion_up<_Up, _Ep>,
|
||
|
|
typename conditional<is_reference<_Dp>::value,
|
||
|
|
is_same<_Ep, _Dp>,
|
||
|
|
is_convertible<_Ep, _Dp>>::type>>
|
||
|
|
unique_ptr(unique_ptr<_Up, _Ep>&& __u) noexcept
|
||
|
|
: _M_t(__u.release(), std::forward<_Ep>(__u.get_deleter()))
|
||
|
|
{ }
|
||
|
|
|
||
|
|
/// Destructor, invokes the deleter if the stored pointer is not null.
|
||
|
|
~unique_ptr()
|
||
|
|
{
|
||
|
|
auto& __ptr = _M_t._M_ptr();
|
||
|
|
if (__ptr != nullptr)
|
||
|
|
get_deleter()(__ptr);
|
||
|
|
__ptr = pointer();
|
||
|
|
}
|
||
|
|
|
||
|
|
// Assignment.
|
||
|
|
|
||
|
|
/** @brief Move assignment operator.
|
||
|
|
*
|
||
|
|
* Invokes the deleter if this object owns a pointer.
|
||
|
|
*/
|
||
|
|
unique_ptr&
|
||
|
|
operator=(unique_ptr&&) = default;
|
||
|
|
|
||
|
|
/** @brief Assignment from another type.
|
||
|
|
*
|
||
|
|
* @param __u The object to transfer ownership from, which owns a
|
||
|
|
* convertible pointer to an array object.
|
||
|
|
*
|
||
|
|
* Invokes the deleter if this object owns a pointer.
|
||
|
|
*/
|
||
|
|
template<typename _Up, typename _Ep>
|
||
|
|
typename
|
||
|
|
enable_if<__and_<__safe_conversion_up<_Up, _Ep>,
|
||
|
|
is_assignable<deleter_type&, _Ep&&>
|
||
|
|
>::value,
|
||
|
|
unique_ptr&>::type
|
||
|
|
operator=(unique_ptr<_Up, _Ep>&& __u) noexcept
|
||
|
|
{
|
||
|
|
reset(__u.release());
|
||
|
|
get_deleter() = std::forward<_Ep>(__u.get_deleter());
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Reset the %unique_ptr to empty, invoking the deleter if necessary.
|
||
|
|
unique_ptr&
|
||
|
|
operator=(nullptr_t) noexcept
|
||
|
|
{
|
||
|
|
reset();
|
||
|
|
return *this;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Observers.
|
||
|
|
|
||
|
|
/// Access an element of owned array.
|
||
|
|
typename std::add_lvalue_reference<element_type>::type
|
||
|
|
operator[](size_t __i) const
|
||
|
|
{
|
||
|
|
__glibcxx_assert(get() != pointer());
|
||
|
|
return get()[__i];
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Return the stored pointer.
|
||
|
|
pointer
|
||
|
|
get() const noexcept
|
||
|
|
{ return _M_t._M_ptr(); }
|
||
|
|
|
||
|
|
/// Return a reference to the stored deleter.
|
||
|
|
deleter_type&
|
||
|
|
get_deleter() noexcept
|
||
|
|
{ return _M_t._M_deleter(); }
|
||
|
|
|
||
|
|
/// Return a reference to the stored deleter.
|
||
|
|
const deleter_type&
|
||
|
|
get_deleter() const noexcept
|
||
|
|
{ return _M_t._M_deleter(); }
|
||
|
|
|
||
|
|
/// Return @c true if the stored pointer is not null.
|
||
|
|
explicit operator bool() const noexcept
|
||
|
|
{ return get() == pointer() ? false : true; }
|
||
|
|
|
||
|
|
// Modifiers.
|
||
|
|
|
||
|
|
/// Release ownership of any stored pointer.
|
||
|
|
pointer
|
||
|
|
release() noexcept
|
||
|
|
{ return _M_t.release(); }
|
||
|
|
|
||
|
|
/** @brief Replace the stored pointer.
|
||
|
|
*
|
||
|
|
* @param __p The new pointer to store.
|
||
|
|
*
|
||
|
|
* The deleter will be invoked if a pointer is already owned.
|
||
|
|
*/
|
||
|
|
template <typename _Up,
|
||
|
|
typename = _Require<
|
||
|
|
__or_<is_same<_Up, pointer>,
|
||
|
|
__and_<is_same<pointer, element_type*>,
|
||
|
|
is_pointer<_Up>,
|
||
|
|
is_convertible<
|
||
|
|
typename remove_pointer<_Up>::type(*)[],
|
||
|
|
element_type(*)[]
|
||
|
|
>
|
||
|
|
>
|
||
|
|
>
|
||
|
|
>>
|
||
|
|
void
|
||
|
|
reset(_Up __p) noexcept
|
||
|
|
{ _M_t.reset(std::move(__p)); }
|
||
|
|
|
||
|
|
void reset(nullptr_t = nullptr) noexcept
|
||
|
|
{ reset(pointer()); }
|
||
|
|
|
||
|
|
/// Exchange the pointer and deleter with another object.
|
||
|
|
void
|
||
|
|
swap(unique_ptr& __u) noexcept
|
||
|
|
{
|
||
|
|
static_assert(__is_swappable<_Dp>::value, "deleter must be swappable");
|
||
|
|
_M_t.swap(__u._M_t);
|
||
|
|
}
|
||
|
|
|
||
|
|
// Disable copy from lvalue.
|
||
|
|
unique_ptr(const unique_ptr&) = delete;
|
||
|
|
unique_ptr& operator=(const unique_ptr&) = delete;
|
||
|
|
};
|
||
|
|
|
||
|
|
/// @relates unique_ptr @{
|
||
|
|
|
||
|
|
/// Swap overload for unique_ptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
inline
|
||
|
|
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
|
||
|
|
// Constrained free swap overload, see p0185r1
|
||
|
|
typename enable_if<__is_swappable<_Dp>::value>::type
|
||
|
|
#else
|
||
|
|
void
|
||
|
|
#endif
|
||
|
|
swap(unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
unique_ptr<_Tp, _Dp>& __y) noexcept
|
||
|
|
{ __x.swap(__y); }
|
||
|
|
|
||
|
|
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
typename enable_if<!__is_swappable<_Dp>::value>::type
|
||
|
|
swap(unique_ptr<_Tp, _Dp>&,
|
||
|
|
unique_ptr<_Tp, _Dp>&) = delete;
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/// Equality operator for unique_ptr objects, compares the owned pointers
|
||
|
|
template<typename _Tp, typename _Dp,
|
||
|
|
typename _Up, typename _Ep>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator==(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{ return __x.get() == __y.get(); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator==(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
|
||
|
|
{ return !__x; }
|
||
|
|
|
||
|
|
#ifndef __cpp_lib_three_way_comparison
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator==(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
|
||
|
|
{ return !__x; }
|
||
|
|
|
||
|
|
/// Inequality operator for unique_ptr objects, compares the owned pointers
|
||
|
|
template<typename _Tp, typename _Dp,
|
||
|
|
typename _Up, typename _Ep>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator!=(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{ return __x.get() != __y.get(); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator!=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t) noexcept
|
||
|
|
{ return (bool)__x; }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator!=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x) noexcept
|
||
|
|
{ return (bool)__x; }
|
||
|
|
#endif // three way comparison
|
||
|
|
|
||
|
|
/// Relational operator for unique_ptr objects, compares the owned pointers
|
||
|
|
template<typename _Tp, typename _Dp,
|
||
|
|
typename _Up, typename _Ep>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator<(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{
|
||
|
|
typedef typename
|
||
|
|
std::common_type<typename unique_ptr<_Tp, _Dp>::pointer,
|
||
|
|
typename unique_ptr<_Up, _Ep>::pointer>::type _CT;
|
||
|
|
return std::less<_CT>()(__x.get(), __y.get());
|
||
|
|
}
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator<(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
|
||
|
|
{
|
||
|
|
return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(),
|
||
|
|
nullptr);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator<(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
|
||
|
|
{
|
||
|
|
return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr,
|
||
|
|
__x.get());
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Relational operator for unique_ptr objects, compares the owned pointers
|
||
|
|
template<typename _Tp, typename _Dp,
|
||
|
|
typename _Up, typename _Ep>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator<=(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{ return !(__y < __x); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
|
||
|
|
{ return !(nullptr < __x); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
|
||
|
|
{ return !(__x < nullptr); }
|
||
|
|
|
||
|
|
/// Relational operator for unique_ptr objects, compares the owned pointers
|
||
|
|
template<typename _Tp, typename _Dp,
|
||
|
|
typename _Up, typename _Ep>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator>(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{ return (__y < __x); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
|
||
|
|
{
|
||
|
|
return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(nullptr,
|
||
|
|
__x.get());
|
||
|
|
}
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator>(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
|
||
|
|
{
|
||
|
|
return std::less<typename unique_ptr<_Tp, _Dp>::pointer>()(__x.get(),
|
||
|
|
nullptr);
|
||
|
|
}
|
||
|
|
|
||
|
|
/// Relational operator for unique_ptr objects, compares the owned pointers
|
||
|
|
template<typename _Tp, typename _Dp,
|
||
|
|
typename _Up, typename _Ep>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator>=(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{ return !(__x < __y); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator>=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
|
||
|
|
{ return !(__x < nullptr); }
|
||
|
|
|
||
|
|
/// unique_ptr comparison with nullptr
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
_GLIBCXX_NODISCARD inline bool
|
||
|
|
operator>=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
|
||
|
|
{ return !(nullptr < __x); }
|
||
|
|
|
||
|
|
#ifdef __cpp_lib_three_way_comparison
|
||
|
|
template<typename _Tp, typename _Dp, typename _Up, typename _Ep>
|
||
|
|
requires three_way_comparable_with<typename unique_ptr<_Tp, _Dp>::pointer,
|
||
|
|
typename unique_ptr<_Up, _Ep>::pointer>
|
||
|
|
inline
|
||
|
|
compare_three_way_result_t<typename unique_ptr<_Tp, _Dp>::pointer,
|
||
|
|
typename unique_ptr<_Up, _Ep>::pointer>
|
||
|
|
operator<=>(const unique_ptr<_Tp, _Dp>& __x,
|
||
|
|
const unique_ptr<_Up, _Ep>& __y)
|
||
|
|
{ return compare_three_way()(__x.get(), __y.get()); }
|
||
|
|
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
requires three_way_comparable<typename unique_ptr<_Tp, _Dp>::pointer>
|
||
|
|
inline
|
||
|
|
compare_three_way_result_t<typename unique_ptr<_Tp, _Dp>::pointer>
|
||
|
|
operator<=>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
|
||
|
|
{
|
||
|
|
using pointer = typename unique_ptr<_Tp, _Dp>::pointer;
|
||
|
|
return compare_three_way()(__x.get(), static_cast<pointer>(nullptr));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
/// @} relates unique_ptr
|
||
|
|
|
||
|
|
/// @cond undocumented
|
||
|
|
template<typename _Up, typename _Ptr = typename _Up::pointer,
|
||
|
|
bool = __poison_hash<_Ptr>::__enable_hash_call>
|
||
|
|
struct __uniq_ptr_hash
|
||
|
|
#if ! _GLIBCXX_INLINE_VERSION
|
||
|
|
: private __poison_hash<_Ptr>
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
size_t
|
||
|
|
operator()(const _Up& __u) const
|
||
|
|
noexcept(noexcept(std::declval<hash<_Ptr>>()(std::declval<_Ptr>())))
|
||
|
|
{ return hash<_Ptr>()(__u.get()); }
|
||
|
|
};
|
||
|
|
|
||
|
|
template<typename _Up, typename _Ptr>
|
||
|
|
struct __uniq_ptr_hash<_Up, _Ptr, false>
|
||
|
|
: private __poison_hash<_Ptr>
|
||
|
|
{ };
|
||
|
|
/// @endcond
|
||
|
|
|
||
|
|
/// std::hash specialization for unique_ptr.
|
||
|
|
template<typename _Tp, typename _Dp>
|
||
|
|
struct hash<unique_ptr<_Tp, _Dp>>
|
||
|
|
: public __hash_base<size_t, unique_ptr<_Tp, _Dp>>,
|
||
|
|
public __uniq_ptr_hash<unique_ptr<_Tp, _Dp>>
|
||
|
|
{ };
|
||
|
|
|
||
|
|
#if __cplusplus >= 201402L
|
||
|
|
/// @relates unique_ptr @{
|
||
|
|
#define __cpp_lib_make_unique 201304
|
||
|
|
|
||
|
|
/// @cond undocumented
|
||
|
|
|
||
|
|
template<typename _Tp>
|
||
|
|
struct _MakeUniq
|
||
|
|
{ typedef unique_ptr<_Tp> __single_object; };
|
||
|
|
|
||
|
|
template<typename _Tp>
|
||
|
|
struct _MakeUniq<_Tp[]>
|
||
|
|
{ typedef unique_ptr<_Tp[]> __array; };
|
||
|
|
|
||
|
|
template<typename _Tp, size_t _Bound>
|
||
|
|
struct _MakeUniq<_Tp[_Bound]>
|
||
|
|
{ struct __invalid_type { }; };
|
||
|
|
|
||
|
|
/// @endcond
|
||
|
|
|
||
|
|
/// std::make_unique for single objects
|
||
|
|
template<typename _Tp, typename... _Args>
|
||
|
|
inline typename _MakeUniq<_Tp>::__single_object
|
||
|
|
make_unique(_Args&&... __args)
|
||
|
|
{ return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); }
|
||
|
|
|
||
|
|
/// std::make_unique for arrays of unknown bound
|
||
|
|
template<typename _Tp>
|
||
|
|
inline typename _MakeUniq<_Tp>::__array
|
||
|
|
make_unique(size_t __num)
|
||
|
|
{ return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__num]()); }
|
||
|
|
|
||
|
|
/// Disable std::make_unique for arrays of known bound
|
||
|
|
template<typename _Tp, typename... _Args>
|
||
|
|
typename _MakeUniq<_Tp>::__invalid_type
|
||
|
|
make_unique(_Args&&...) = delete;
|
||
|
|
|
||
|
|
#if __cplusplus > 201703L
|
||
|
|
/// std::make_unique_for_overwrite for single objects
|
||
|
|
template<typename _Tp>
|
||
|
|
inline typename _MakeUniq<_Tp>::__single_object
|
||
|
|
make_unique_for_overwrite()
|
||
|
|
{ return unique_ptr<_Tp>(new _Tp); }
|
||
|
|
|
||
|
|
/// std::make_unique_for_overwrite for arrays of unknown bound
|
||
|
|
template<typename _Tp>
|
||
|
|
inline typename _MakeUniq<_Tp>::__array
|
||
|
|
make_unique_for_overwrite(size_t __n)
|
||
|
|
{ return unique_ptr<_Tp>(new remove_extent_t<_Tp>[__n]); }
|
||
|
|
|
||
|
|
/// Disable std::make_unique_for_overwrite for arrays of known bound
|
||
|
|
template<typename _Tp, typename... _Args>
|
||
|
|
typename _MakeUniq<_Tp>::__invalid_type
|
||
|
|
make_unique_for_overwrite(_Args&&...) = delete;
|
||
|
|
#endif // C++20
|
||
|
|
|
||
|
|
/// @} relates unique_ptr
|
||
|
|
#endif // C++14
|
||
|
|
|
||
|
|
#if __cplusplus > 201703L && __cpp_concepts
|
||
|
|
// _GLIBCXX_RESOLVE_LIB_DEFECTS
|
||
|
|
// 2948. unique_ptr does not define operator<< for stream output
|
||
|
|
/// Stream output operator for unique_ptr
|
||
|
|
template<typename _CharT, typename _Traits, typename _Tp, typename _Dp>
|
||
|
|
inline basic_ostream<_CharT, _Traits>&
|
||
|
|
operator<<(basic_ostream<_CharT, _Traits>& __os,
|
||
|
|
const unique_ptr<_Tp, _Dp>& __p)
|
||
|
|
requires requires { __os << __p.get(); }
|
||
|
|
{
|
||
|
|
__os << __p.get();
|
||
|
|
return __os;
|
||
|
|
}
|
||
|
|
#endif // C++20
|
||
|
|
|
||
|
|
/// @} group pointer_abstractions
|
||
|
|
|
||
|
|
#if __cplusplus >= 201703L
|
||
|
|
namespace __detail::__variant
|
||
|
|
{
|
||
|
|
template<typename> struct _Never_valueless_alt; // see <variant>
|
||
|
|
|
||
|
|
// Provide the strong exception-safety guarantee when emplacing a
|
||
|
|
// unique_ptr into a variant.
|
||
|
|
template<typename _Tp, typename _Del>
|
||
|
|
struct _Never_valueless_alt<std::unique_ptr<_Tp, _Del>>
|
||
|
|
: std::true_type
|
||
|
|
{ };
|
||
|
|
} // namespace __detail::__variant
|
||
|
|
#endif // C++17
|
||
|
|
|
||
|
|
_GLIBCXX_END_NAMESPACE_VERSION
|
||
|
|
} // namespace
|
||
|
|
|
||
|
|
#endif /* _UNIQUE_PTR_H */
|