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/****************************************************************************
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**
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** Copyright (C) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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**
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** This file is part of the Qt Script Generator project on Qt Labs.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef RXX_ALLOCATOR_H
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#define RXX_ALLOCATOR_H
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#include <cstddef>
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#include <cstdlib>
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#include <cstring>
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#include <memory>
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template <class _Tp> class rxx_allocator {
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public:
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typedef _Tp value_type;
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typedef _Tp* pointer;
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typedef const _Tp* const_pointer;
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typedef _Tp& reference;
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typedef const _Tp& const_reference;
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typedef std::size_t size_type;
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typedef std::ptrdiff_t difference_type;
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static const size_type max_block_count = size_type(-1);
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static const size_type _S_block_size = 1 << 16; // 64K
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rxx_allocator() {
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_M_block_index = max_block_count;
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_M_current_index = 0;
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_M_storage = 0;
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_M_current_block = 0;
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}
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~rxx_allocator() {
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for (size_type index = 0; index < _M_block_index + 1; ++index)
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delete[] _M_storage[index];
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::free(_M_storage);
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}
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pointer address(reference __val) { return &__val; }
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const_pointer address(const_reference __val) const { return &__val; }
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pointer allocate(size_type __n, const void* = 0) {
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const size_type bytes = __n * sizeof(_Tp);
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if (_M_current_block == 0
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|| _S_block_size < _M_current_index + bytes)
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{
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++_M_block_index;
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_M_storage = reinterpret_cast<char**>
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(::realloc(_M_storage, sizeof(char*) * (1 + _M_block_index)));
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_M_current_block = _M_storage[_M_block_index] = reinterpret_cast<char*>
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(new char[_S_block_size]);
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#if defined(RXX_ALLOCATOR_INIT_0) // ### make it a policy
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::memset(_M_current_block, 0, _S_block_size);
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#endif
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_M_current_index = 0;
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}
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pointer p = reinterpret_cast<pointer>
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(_M_current_block + _M_current_index);
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_M_current_index += bytes;
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return p;
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}
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void deallocate(pointer __p, size_type __n) {}
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size_type max_size() const { return size_type(-1) / sizeof(_Tp); }
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void contruct(pointer __p, const_reference __val) { new (__p) _Tp(__val); }
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void destruct(pointer __p) { __p->~_Tp(); }
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private:
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template <class _Tp1> struct rebind {
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typedef rxx_allocator<_Tp1> other;
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};
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template <class _Tp1> rxx_allocator(const rxx_allocator<_Tp1> &__o) {}
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private:
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size_type _M_block_index;
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size_type _M_current_index;
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char *_M_current_block;
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char **_M_storage;
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};
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#endif // RXX_ALLOCATOR_H
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// kate: space-indent on; indent-width 2; replace-tabs on;
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