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
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Last modified Sat May 10 16:24:56 2008