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/* -*- 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();
(void)p; // avoid bogus MSVC '12 "unreferenced formal parameter" warning
}
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);
}
};
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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