PxSList.h

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// Copyright (c) 2008-2022 NVIDIA Corporation. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
 
#ifndef PX_SLIST_H
#define PX_SLIST_H
 
#include "foundation/Px.h"
#include "foundation/PxAssert.h"
#include "foundation/PxAlignedMalloc.h"
 
#if PX_P64_FAMILY
    #define PX_SLIST_ALIGNMENT 16
#else
    #define PX_SLIST_ALIGNMENT 8
#endif
 
#if !PX_DOXYGEN
namespace physx
{
#endif
#if PX_VC
    #pragma warning(push)
    #pragma warning(disable : 4324) // Padding was added at the end of a structure because of a __declspec(align) value.
#endif
 
PX_ALIGN_PREFIX(PX_SLIST_ALIGNMENT)
class PxSListEntry
{
    friend struct PxSListImpl;
 
  public:
    PxSListEntry() : mNext(NULL)
    {
        PX_ASSERT((size_t(this) & (PX_SLIST_ALIGNMENT - 1)) == 0);
    }
 
    // Only use on elements returned by SList::flush()
    // because the operation is not atomic.
    PxSListEntry* next()
    {
        return mNext;
    }
 
  private:
    PxSListEntry* mNext;
}PX_ALIGN_SUFFIX(PX_SLIST_ALIGNMENT);
 
#if PX_VC
    #pragma warning(pop)
#endif
 
// template-less implementation
struct PX_FOUNDATION_API PxSListImpl
{
    PxSListImpl();
    ~PxSListImpl();
    void push(PxSListEntry* entry);
    PxSListEntry* pop();
    PxSListEntry* flush();
    static uint32_t getSize();
};
 
template <typename Alloc = PxReflectionAllocator<PxSListImpl> >
class PxSListT : protected Alloc
{
  public:
    PxSListT(const Alloc& alloc = Alloc()) : Alloc(alloc)
    {
        mImpl = reinterpret_cast<PxSListImpl*>(Alloc::allocate(PxSListImpl::getSize(), __FILE__, __LINE__));
        PX_ASSERT((size_t(mImpl) & (PX_SLIST_ALIGNMENT - 1)) == 0);
        PX_PLACEMENT_NEW(mImpl, PxSListImpl)();
    }
    ~PxSListT()
    {
        mImpl->~PxSListImpl();
        Alloc::deallocate(mImpl);
    }
 
    // pushes a new element to the list
    void push(PxSListEntry& entry)
    {
        mImpl->push(&entry);
    }
 
    // pops an element from the list
    PxSListEntry* pop()
    {
        return mImpl->pop();
    }
 
    // removes all items from list, returns pointer to first element
    PxSListEntry* flush()
    {
        return mImpl->flush();
    }
 
  private:
    PxSListImpl* mImpl;
};
 
typedef PxSListT<> PxSList;
 
#if !PX_DOXYGEN
} // namespace physx
#endif
 
#endif