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/*
* Copyright (c) 2008-2017, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA CORPORATION and its licensors retain all intellectual property
* and proprietary rights in and to this software, related documentation
* and any modifications thereto. Any use, reproduction, disclosure or
* distribution of this software and related documentation without an express
* license agreement from NVIDIA CORPORATION is strictly prohibited.
*/
#ifndef APEX_BINARY_HEAP_H
#define APEX_BINARY_HEAP_H
#include "ApexDefs.h"
namespace nvidia
{
namespace apex
{
template <class Comparable>
class ApexBinaryHeap
{
public:
explicit ApexBinaryHeap(int capacity = 100) : mCurrentSize(0)
{
if (capacity > 0)
{
mArray.reserve((uint32_t)capacity + 1);
}
mArray.insert();
}
bool isEmpty() const
{
return mCurrentSize == 0;
}
const Comparable& peek() const
{
PX_ASSERT(mArray.size() > 1);
return mArray[1];
}
void push(const Comparable& x)
{
mArray.insert();
// Percolate up
mCurrentSize++;
uint32_t hole = mCurrentSize;
while (hole > 1)
{
uint32_t parent = hole >> 1;
if (!(x < mArray[parent]))
{
break;
}
mArray[hole] = mArray[parent];
hole = parent;
}
mArray[hole] = x;
}
void pop()
{
if (mArray.size() > 1)
{
mArray[1] = mArray[mCurrentSize--];
percolateDown(1);
mArray.popBack();
}
}
void pop(Comparable& minItem)
{
if (mArray.size() > 1)
{
minItem = mArray[1];
mArray[1] = mArray[mCurrentSize--];
percolateDown(1);
mArray.popBack();
}
}
private:
uint32_t mCurrentSize; // Number of elements in heap
physx::Array<Comparable> mArray;
void buildHeap()
{
for (uint32_t i = mCurrentSize / 2; i > 0; i--)
{
percolateDown(i);
}
}
void percolateDown(uint32_t hole)
{
Comparable tmp = mArray[hole];
while (hole * 2 <= mCurrentSize)
{
uint32_t child = hole * 2;
if (child != mCurrentSize && mArray[child + 1] < mArray[child])
{
child++;
}
if (mArray[child] < tmp)
{
mArray[hole] = mArray[child];
}
else
{
break;
}
hole = child;
}
mArray[hole] = tmp;
}
};
}
} // end namespace nvidia::apex
#endif // APEX_BINARY_HEAP_H
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