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/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Script Generator project on Qt Labs.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef RXX_ALLOCATOR_H
#define RXX_ALLOCATOR_H
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <memory>
template <class _Tp> class rxx_allocator {
public:
typedef _Tp value_type;
typedef _Tp* pointer;
typedef const _Tp* const_pointer;
typedef _Tp& reference;
typedef const _Tp& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
static const size_type max_block_count = size_type(-1);
static const size_type _S_block_size = 1 << 16; // 64K
rxx_allocator() {
_M_block_index = max_block_count;
_M_current_index = 0;
_M_storage = 0;
_M_current_block = 0;
}
~rxx_allocator() {
for (size_type index = 0; index < _M_block_index + 1; ++index)
delete[] _M_storage[index];
::free(_M_storage);
}
pointer address(reference __val) { return &__val; }
const_pointer address(const_reference __val) const { return &__val; }
pointer allocate(size_type __n, const void* = 0) {
const size_type bytes = __n * sizeof(_Tp);
if (_M_current_block == 0
|| _S_block_size < _M_current_index + bytes)
{
++_M_block_index;
_M_storage = reinterpret_cast<char**>
(::realloc(_M_storage, sizeof(char*) * (1 + _M_block_index)));
_M_current_block = _M_storage[_M_block_index] = reinterpret_cast<char*>
(new char[_S_block_size]);
#if defined(RXX_ALLOCATOR_INIT_0) // ### make it a policy
::memset(_M_current_block, 0, _S_block_size);
#endif
_M_current_index = 0;
}
pointer p = reinterpret_cast<pointer>
(_M_current_block + _M_current_index);
_M_current_index += bytes;
return p;
}
void deallocate(pointer __p, size_type __n) {}
size_type max_size() const { return size_type(-1) / sizeof(_Tp); }
void contruct(pointer __p, const_reference __val) { new (__p) _Tp(__val); }
void destruct(pointer __p) { __p->~_Tp(); }
private:
template <class _Tp1> struct rebind {
typedef rxx_allocator<_Tp1> other;
};
template <class _Tp1> rxx_allocator(const rxx_allocator<_Tp1> &__o) {}
private:
size_type _M_block_index;
size_type _M_current_index;
char *_M_current_block;
char **_M_storage;
};
#endif // RXX_ALLOCATOR_H
// kate: space-indent on; indent-width 2; replace-tabs on;
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