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+// array allocator -*- C++ -*-
+
+// Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
+// 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 ext/array_allocator.h
+ * This file is a GNU extension to the Standard C++ Library.
+ */
+
+#ifndef _ARRAY_ALLOCATOR_H
+#define _ARRAY_ALLOCATOR_H 1
+
+#include <cstddef>
+#include <new>
+#include <bits/functexcept.h>
+#include <tr1/array>
+#include <bits/move.h>
+
+_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
+
+ using std::size_t;
+ using std::ptrdiff_t;
+
+ /// Base class.
+ template<typename _Tp>
+ class array_allocator_base
+ {
+ public:
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Tp* pointer;
+ typedef const _Tp* const_pointer;
+ typedef _Tp& reference;
+ typedef const _Tp& const_reference;
+ typedef _Tp value_type;
+
+ pointer
+ address(reference __x) const { return &__x; }
+
+ const_pointer
+ address(const_reference __x) const { return &__x; }
+
+ void
+ deallocate(pointer, size_type)
+ {
+ // Does nothing.
+ }
+
+ size_type
+ max_size() const throw()
+ { return size_t(-1) / sizeof(_Tp); }
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 402. wrong new expression in [some_] allocator::construct
+ void
+ construct(pointer __p, const _Tp& __val)
+ { ::new((void *)__p) value_type(__val); }
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+ template<typename... _Args>
+ void
+ construct(pointer __p, _Args&&... __args)
+ { ::new((void *)__p) _Tp(std::forward<_Args>(__args)...); }
+#endif
+
+ void
+ destroy(pointer __p) { __p->~_Tp(); }
+ };
+
+ /**
+ * @brief An allocator that uses previously allocated memory.
+ * This memory can be externally, globally, or otherwise allocated.
+ * @ingroup allocators
+ */
+ template<typename _Tp, typename _Array = std::tr1::array<_Tp, 1> >
+ class array_allocator : public array_allocator_base<_Tp>
+ {
+ public:
+ typedef size_t size_type;
+ typedef ptrdiff_t difference_type;
+ typedef _Tp* pointer;
+ typedef const _Tp* const_pointer;
+ typedef _Tp& reference;
+ typedef const _Tp& const_reference;
+ typedef _Tp value_type;
+ typedef _Array array_type;
+
+ private:
+ array_type* _M_array;
+ size_type _M_used;
+
+ public:
+ template<typename _Tp1, typename _Array1 = _Array>
+ struct rebind
+ { typedef array_allocator<_Tp1, _Array1> other; };
+
+ array_allocator(array_type* __array = NULL) throw()
+ : _M_array(__array), _M_used(size_type()) { }
+
+ array_allocator(const array_allocator& __o) throw()
+ : _M_array(__o._M_array), _M_used(__o._M_used) { }
+
+ template<typename _Tp1, typename _Array1>
+ array_allocator(const array_allocator<_Tp1, _Array1>&) throw()
+ : _M_array(NULL), _M_used(size_type()) { }
+
+ ~array_allocator() throw() { }
+
+ pointer
+ allocate(size_type __n, const void* = 0)
+ {
+ if (_M_array == 0 || _M_used + __n > _M_array->size())
+ std::__throw_bad_alloc();
+ pointer __ret = _M_array->begin() + _M_used;
+ _M_used += __n;
+ return __ret;
+ }
+ };
+
+ template<typename _Tp, typename _Array>
+ inline bool
+ operator==(const array_allocator<_Tp, _Array>&,
+ const array_allocator<_Tp, _Array>&)
+ { return true; }
+
+ template<typename _Tp, typename _Array>
+ inline bool
+ operator!=(const array_allocator<_Tp, _Array>&,
+ const array_allocator<_Tp, _Array>&)
+ { return false; }
+
+_GLIBCXX_END_NAMESPACE
+
+#endif