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//  * Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//  * Neither the name of NVIDIA CORPORATION nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Copyright (c) 2008-2024 NVIDIA Corporation. All rights reserved.

#ifndef NV_NSFOUNDATION_NSINLINEALLOCATOR_H
#define NV_NSFOUNDATION_NSINLINEALLOCATOR_H

#include "NsUserAllocated.h"

namespace nvidia
{
namespace shdfnd
{
// this is used by the array class to allocate some space for a small number
// of objects along with the metadata
template <uint32_t N, typename BaseAllocator>
class InlineAllocator : private BaseAllocator
{
  public:
    InlineAllocator(const NvEMPTY v) : BaseAllocator(v)
    {
    }

    InlineAllocator(const BaseAllocator& alloc = BaseAllocator()) : BaseAllocator(alloc), mBufferUsed(false)
    {
    }

    InlineAllocator(const InlineAllocator& aloc) : BaseAllocator(aloc), mBufferUsed(false)
    {
    }

    void* allocate(uint32_t size, const char* filename, int 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);
    }

    NV_FORCE_INLINE uint8_t* getInlineBuffer()
    {
        return mBuffer;
    }
    NV_FORCE_INLINE bool isBufferUsed() const
    {
        return mBufferUsed;
    }

  protected:
    uint8_t mBuffer[N];
    bool mBufferUsed;
};
} // namespace shdfnd
} // namespace nvidia

#endif // #ifndef NV_NSFOUNDATION_NSINLINEALLOCATOR_H
