b2StackAllocator.h
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00001 /*
00002 * Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
00003 *
00004 * This software is provided 'as-is', without any express or implied
00005 * warranty.  In no event will the authors be held liable for any damages
00006 * arising from the use of this software.
00007 * Permission is granted to anyone to use this software for any purpose,
00008 * including commercial applications, and to alter it and redistribute it
00009 * freely, subject to the following restrictions:
00010 * 1. The origin of this software must not be misrepresented; you must not
00011 * claim that you wrote the original software. If you use this software
00012 * in a product, an acknowledgment in the product documentation would be
00013 * appreciated but is not required.
00014 * 2. Altered source versions must be plainly marked as such, and must not be
00015 * misrepresented as being the original software.
00016 * 3. This notice may not be removed or altered from any source distribution.
00017 */
00018 
00019 #ifndef B2_STACK_ALLOCATOR_H
00020 #define B2_STACK_ALLOCATOR_H
00021 
00022 #include <Box2D/Common/b2Settings.h>
00023 
00024 const int32 b2_stackSize = 100 * 1024;  // 100k
00025 const int32 b2_maxStackEntries = 32;
00026 
00027 struct b2StackEntry
00028 {
00029         char* data;
00030         int32 size;
00031         bool usedMalloc;
00032 };
00033 
00034 // This is a stack allocator used for fast per step allocations.
00035 // You must nest allocate/free pairs. The code will assert
00036 // if you try to interleave multiple allocate/free pairs.
00037 class b2StackAllocator
00038 {
00039 public:
00040         b2StackAllocator();
00041         ~b2StackAllocator();
00042 
00043         void* Allocate(int32 size);
00044         void Free(void* p);
00045 
00046         int32 GetMaxAllocation() const;
00047 
00048 private:
00049 
00050         char m_data[b2_stackSize];
00051         int32 m_index;
00052 
00053         int32 m_allocation;
00054         int32 m_maxAllocation;
00055 
00056         b2StackEntry m_entries[b2_maxStackEntries];
00057         int32 m_entryCount;
00058 };
00059 
00060 #endif


mvsim
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autogenerated on Thu Sep 7 2017 09:27:48