/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 */

#pragma once

#include <limits>

#include <rtl/alloc.h>

namespace sc {

/**

 * Custom allocator for STL container to ensure that the base address of

 * allocated storage is aligned to a specified boundary.

 */

template<typename T, size_t Alignment>

class AlignedAllocator

{

public:

    typedef T value_type;

    typedef size_t size_type;

    typedef std::ptrdiff_t difference_type;

    typedef T* pointer;

    typedef const T* const_pointer;

    typedef T* void_pointer;

    typedef T& reference;

    typedef const T& const_reference;

    template<typename Type2>

    struct rebind

    {

        typedef AlignedAllocator<Type2,Alignment> other;

    };

    AlignedAllocator() {}

    template<typename Type2>

    AlignedAllocator(const AlignedAllocator<Type2,Alignment>&) {}

    static void construct(T* p, const value_type& val) { new(p) value_type(val); }

    static void destroy(T* p)

    {

        p->~value_type();

    }

    static size_type max_size()

    {

        return std::numeric_limits<size_type>::max() / sizeof(value_type);

    }

    bool operator== (const AlignedAllocator&) const { return true; }

    bool operator!= (const AlignedAllocator&) const { return false; }

    static pointer allocate(size_type n)

    {

        return static_cast<pointer>(rtl_allocateAlignedMemory(Alignment, n*sizeof(value_type)));

    }

    static void deallocate(pointer p, size_type)

    {

        rtl_freeAlignedMemory(p);

    }

};

}

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