b2StackAllocator.h
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上传日期:2022-01-07
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- /*
- * Copyright (c) 2006-2009 Erin Catto http://www.gphysics.com
- *
- * This software is provided 'as-is', without any express or implied
- * warranty. In no event will the authors be held liable for any damages
- * arising from the use of this software.
- * Permission is granted to anyone to use this software for any purpose,
- * including commercial applications, and to alter it and redistribute it
- * freely, subject to the following restrictions:
- * 1. The origin of this software must not be misrepresented; you must not
- * claim that you wrote the original software. If you use this software
- * in a product, an acknowledgment in the product documentation would be
- * appreciated but is not required.
- * 2. Altered source versions must be plainly marked as such, and must not be
- * misrepresented as being the original software.
- * 3. This notice may not be removed or altered from any source distribution.
- */
- #ifndef B2_STACK_ALLOCATOR_H
- #define B2_STACK_ALLOCATOR_H
- #include <Box2D/Common/b2Settings.h>
- const int32 b2_stackSize = 100 * 1024; // 100k
- const int32 b2_maxStackEntries = 32;
- struct b2StackEntry
- {
- char* data;
- int32 size;
- bool usedMalloc;
- };
- // This is a stack allocator used for fast per step allocations.
- // You must nest allocate/free pairs. The code will assert
- // if you try to interleave multiple allocate/free pairs.
- class b2StackAllocator
- {
- public:
- b2StackAllocator();
- ~b2StackAllocator();
- void* Allocate(int32 size);
- void Free(void* p);
- int32 GetMaxAllocation() const;
- private:
- char m_data[b2_stackSize];
- int32 m_index;
- int32 m_allocation;
- int32 m_maxAllocation;
- b2StackEntry m_entries[b2_maxStackEntries];
- int32 m_entryCount;
- };
- #endif