61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#ifndef B2_STACK_ALLOCATOR_H
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#define B2_STACK_ALLOCATOR_H
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#include "Box2D/Common/b2Settings.h"
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const int32 b2_stackSize = 100 * 1024; // 100k
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const int32 b2_maxStackEntries = 32;
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struct b2StackEntry
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{
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char* data;
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int32 size;
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bool usedMalloc;
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};
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// This is a stack allocator used for fast per step allocations.
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// You must nest allocate/free pairs. The code will assert
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// if you try to interleave multiple allocate/free pairs.
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class b2StackAllocator
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{
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public:
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b2StackAllocator();
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~b2StackAllocator();
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void* Allocate(int32 size);
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void Free(void* p);
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int32 GetMaxAllocation() const;
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private:
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char m_data[b2_stackSize];
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int32 m_index;
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int32 m_allocation;
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int32 m_maxAllocation;
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b2StackEntry m_entries[b2_maxStackEntries];
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int32 m_entryCount;
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};
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#endif
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