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+// Guarded Allocation -*- C++ -*-
+
+// Copyright (C) 2014 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
+// <http://www.gnu.org/licenses/>.
+
+/** @file bits/allocated_ptr.h
+ * This is an internal header file, included by other library headers.
+ * Do not attempt to use it directly. @headername{memory}
+ */
+
+#ifndef _ALLOCATED_PTR_H
+#define _ALLOCATED_PTR_H 1
+
+#if __cplusplus < 201103L
+# include <bits/c++0xwarning.h>
+#else
+# include <type_traits>
+# include <bits/ptr_traits.h>
+# include <bits/alloc_traits.h>
+
+namespace std _GLIBCXX_VISIBILITY(default)
+{
+_GLIBCXX_BEGIN_NAMESPACE_VERSION
+
+ /// Non-standard RAII type for managing pointers obtained from allocators.
+ template<typename _Alloc>
+ struct __allocated_ptr
+ {
+ using pointer = typename allocator_traits<_Alloc>::pointer;
+ using value_type = typename allocator_traits<_Alloc>::value_type;
+
+ /// Take ownership of __ptr
+ __allocated_ptr(_Alloc& __a, pointer __ptr) noexcept
+ : _M_alloc(&__a), _M_ptr(__ptr)
+ { }
+
+ /// Convert __ptr to allocator's pointer type and take ownership of it
+ template<typename _Ptr,
+ typename _Req = _Require<is_same<_Ptr, value_type*>>>
+ __allocated_ptr(_Alloc& __a, _Ptr __ptr)
+ : _M_alloc(&__a), _M_ptr(pointer_traits<pointer>::pointer_to(*__ptr))
+ { }
+
+ /// Transfer ownership of the owned pointer
+ __allocated_ptr(__allocated_ptr&& __gd) noexcept
+ : _M_alloc(__gd._M_alloc), _M_ptr(__gd._M_ptr)
+ { __gd._M_ptr = nullptr; }
+
+ /// Deallocate the owned pointer
+ ~__allocated_ptr()
+ {
+ if (_M_ptr != nullptr)
+ std::allocator_traits<_Alloc>::deallocate(*_M_alloc, _M_ptr, 1);
+ }
+
+ /// Release ownership of the owned pointer
+ __allocated_ptr& operator=(std::nullptr_t) noexcept { _M_ptr = nullptr; }
+
+ /// Get the address that the owned pointer refers to.
+ value_type* get() { return _S_raw_ptr(_M_ptr); }
+
+ private:
+ value_type* _S_raw_ptr(value_type* __ptr) { return __ptr; }
+
+ template<typename _Ptr>
+ auto _S_raw_ptr(_Ptr __ptr) -> decltype(_S_raw_ptr(__ptr.operator->()))
+ { return _S_raw_ptr(__ptr.operator->()); }
+
+ _Alloc* _M_alloc;
+ pointer _M_ptr;
+ };
+
+ /// Allocate space for a single object using __a
+ template<typename _Alloc>
+ __allocated_ptr<_Alloc>
+ __allocate_guarded(_Alloc& __a)
+ {
+ return { __a, std::allocator_traits<_Alloc>::allocate(__a, 1) };
+ }
+
+_GLIBCXX_END_NAMESPACE_VERSION
+} // namespace std
+
+#endif
+#endif