81 lines
2 KiB
C++
81 lines
2 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#ifndef INCLUDED_SC_INC_STLALGORITHM_HXX
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#define INCLUDED_SC_INC_STLALGORITHM_HXX
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#include <functional>
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#include <limits>
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#include <rtl/alloc.h>
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namespace sc {
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/**
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* Custom allocator for STL container to ensure that the base address of
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* allocated storage is aligned to a specified boundary.
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*/
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template<typename T, size_t _Alignment>
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class AlignedAllocator
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{
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public:
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typedef T value_type;
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typedef size_t size_type;
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typedef std::ptrdiff_t difference_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef T* void_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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template<typename _Type2>
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struct rebind
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{
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typedef AlignedAllocator<_Type2,_Alignment> other;
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};
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AlignedAllocator() {}
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~AlignedAllocator() {}
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template<typename _Type2>
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AlignedAllocator(const AlignedAllocator<_Type2,_Alignment>&) {}
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void construct(T* p, const value_type& val) { new(p) value_type(val); }
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void destroy(T* p)
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{
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p->~value_type();
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(void)p; // avoid bogus MSVC '12 "unreferenced formal parameter" warning
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}
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size_type max_size() const
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{
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return std::numeric_limits<size_type>::max() / sizeof(value_type);
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}
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bool operator== (const AlignedAllocator&) const { return true; }
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bool operator!= (const AlignedAllocator&) const { return false; }
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pointer allocate(size_type n)
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{
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return (pointer)rtl_allocateAlignedMemory(_Alignment, n*sizeof(value_type));
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}
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void deallocate(pointer p, size_type)
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{
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rtl_freeAlignedMemory(p);
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}
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};
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}
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#endif
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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