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//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// * 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
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2018 NVIDIA Corporation. All rights reserved.
#ifndef LINK_H
#define LINK_H
#include "PxSimpleTypes.h"
#include "PxAssert.h"
namespace nvidia
{
namespace apex
{
class Link
{
public:
Link()
{
adj[1] = adj[0] = this;
}
virtual ~Link()
{
remove();
}
/*
which = 0: (-A-...-B-link-) + (-this-X-...-Y-) = (-A-...-B-link-this-X-...-Y-)
which = 1: (-X-...-Y-this-) + (-link-A-...-B-) = (-X-...-Y-this-link-A-...-B-)
*/
void setAdj(uint32_t which, Link* link)
{
uint32_t other = (which &= 1) ^ 1;
Link* linkAdjOther = link->adj[other];
adj[which]->adj[other] = linkAdjOther;
linkAdjOther->adj[which] = adj[which];
adj[which] = link;
link->adj[other] = this;
}
Link* getAdj(uint32_t which) const
{
return adj[which & 1];
}
void remove()
{
adj[1]->adj[0] = adj[0];
adj[0]->adj[1] = adj[1];
adj[1] = adj[0] = this;
}
bool isSolitary() const
{
PX_ASSERT((adj[0] == this) == (adj[1] == this));
return adj[0] == this;
}
protected:
Link* adj[2];
};
}
} // end namespace nvidia::apex
#endif // #ifndef LINK_H
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