PxInlineAllocator.h

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// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
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#ifndef PX_INLINE_ALLOCATOR_H
#define PX_INLINE_ALLOCATOR_H
 
#include "foundation/PxUserAllocated.h"
 
#if !PX_DOXYGEN
namespace physx
{
#endif
// this is used by the array class to allocate some space for a small number
// of objects along with the metadata
template <PxU32 N, typename BaseAllocator>
class PxInlineAllocator : private BaseAllocator
{
  public:
    PxInlineAllocator(const PxEMPTY v) : BaseAllocator(v)
    {
    }
 
    PxInlineAllocator(const BaseAllocator& alloc = BaseAllocator()) : BaseAllocator(alloc), mBufferUsed(false)
    {
    }
 
    PxInlineAllocator(const PxInlineAllocator& aloc) : BaseAllocator(aloc), mBufferUsed(false)
    {
    }
 
    void* allocate(PxU32 size, const char* filename, PxI32 line)
    {
        if(!mBufferUsed && size <= N)
        {
            mBufferUsed = true;
            return mBuffer;
        }
        return BaseAllocator::allocate(size, filename, line);
    }
 
    void deallocate(void* ptr)
    {
        if(ptr == mBuffer)
            mBufferUsed = false;
        else
            BaseAllocator::deallocate(ptr);
    }
 
    PX_FORCE_INLINE PxU8* getInlineBuffer()
    {
        return mBuffer;
    }
    PX_FORCE_INLINE bool isBufferUsed() const
    {
        return mBufferUsed;
    }
 
  protected:
    PxU8 mBuffer[N];
    bool mBufferUsed;
};
#if !PX_DOXYGEN
} // namespace physx
#endif
 
#endif