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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// SPDX-FileCopyrightText: Copyright (c) 2008-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
#ifndef PX_SLIST_H
#define PX_SLIST_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(), PX_FL));
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