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# OgreAlignedAllocator.h

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    00001 /*
    00002 -----------------------------------------------------------------------------
    00003 This source file is part of OGRE
    00004     (Object-oriented Graphics Rendering Engine)
    00005 For the latest info, see http://www.ogre3d.org/
    00006
    00007 Copyright (c) 2000-2006 Torus Knot Software Ltd
    00008 Also see acknowledgements in Readme.html
    00009
    00010 This program is free software; you can redistribute it and/or modify it under
    00011 the terms of the GNU Lesser General Public License as published by the Free Software
    00012 Foundation; either version 2 of the License, or (at your option) any later
    00013 version.
    00014
    00015 This program is distributed in the hope that it will be useful, but WITHOUT
    00016 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    00017 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
    00018
    00019 You should have received a copy of the GNU Lesser General Public License along with
    00020 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
    00021 Place - Suite 330, Boston, MA 02111-1307, USA, or go to
    00022 http://www.gnu.org/copyleft/lesser.txt.
    00023
    00024 You may alternatively use this source under the terms of a specific version of
    00025 the OGRE Unrestricted License provided you have obtained such a license from
    00026 Torus Knot Software Ltd.
    00027 -----------------------------------------------------------------------------
    00028 */
    00029 #ifndef __AlignedAllocator_H__
    00030 #define __AlignedAllocator_H__
    00031
    00032 #include "OgrePrerequisites.h"
    00033
    00034 namespace Ogre {
    00035
    00054     class _OgreExport AlignedMemory
    00055     {
    00056     public:
    00068         static void* allocate(size_t size, size_t alignment);
    00069
    00082         static void* allocate(size_t size);
    00083
    00090         static void deallocate(void* p);
    00091     };
    00092
    00103     template <typename T, unsigned Alignment = 0>
    00104     class AlignedAllocator
    00105     {
    00106         // compile-time check alignment is available.
    00107         typedef int IsValidAlignment
    00108             [Alignment <= 128 && ((Alignment & (Alignment-1)) == 0) ? +1 : -1];
    00109
    00110     public:
    00111         //--- typedefs for STL compatible
    00112
    00113         typedef T value_type;
    00114
    00115         typedef value_type * pointer;
    00116         typedef const value_type * const_pointer;
    00117         typedef value_type & reference;
    00118         typedef const value_type & const_reference;
    00119         typedef std::size_t size_type;
    00120         typedef std::ptrdiff_t difference_type;
    00121
    00122         template <typename U>
    00123         struct rebind
    00124         {
    00125             typedef AlignedAllocator<U, Alignment> other;
    00126         };
    00127
    00128     public:
    00129         AlignedAllocator() { /* nothing to do */ }
    00130
    00131         // default copy constructor
    00132
    00133         // default assignment operator
    00134
    00135         // not explicit, mimicking std::allocator [20.4.1]
    00136         template <typename U, unsigned A>
    00137         AlignedAllocator(const AlignedAllocator<U, A> &) { /* nothing to do */ }
    00138
    00139         // default destructor
    00140
    00141         //--- functions for STL compatible
    00142
    00143         static pointer address(reference r)
    00144         { return &r; }
    00145         static const_pointer address(const_reference s)
    00146         { return &s; }
    00147         static size_type max_size()
    00148         { return (std::numeric_limits<size_type>::max)(); }
    00149         static void construct(const pointer ptr, const value_type & t)
    00150         { new (ptr) T(t); }
    00151         static void destroy(const pointer ptr)
    00152         {
    00153             ptr->~T();
    00154             (void) ptr; // avoid unused variable warning
    00155         }
    00156
    00157         bool operator==(const AlignedAllocator &) const
    00158         { return true; }
    00159         bool operator!=(const AlignedAllocator &) const
    00160         { return false; }
    00161
    00162         static pointer allocate(const size_type n)
    00163         {
    00164             // use default platform dependent alignment if 'Alignment' equal to zero.
    00165             const pointer ret = static_cast<pointer>(Alignment ?
    00166                 AlignedMemory::allocate(sizeof(T) * n, Alignment) :
    00167                 AlignedMemory::allocate(sizeof(T) * n));
    00168             return ret;
    00169         }
    00170         static pointer allocate(const size_type n, const void * const)
    00171         {
    00172             return allocate(n);
    00173         }
    00174         static void deallocate(const pointer ptr, const size_type)
    00175         {
    00176             AlignedMemory::deallocate(ptr);
    00177         }
    00178     };
    00179 }
    00180
    00181 #endif  // __AlignedAllocator_H__

Copyright © 2000-2005 by The OGRE Team
This work is licensed under a Creative Commons Attribution-ShareAlike 2.5 License.
Last modified Sun Sep 30 10:50:56 2007