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using System.Collections;
using System.Collections.Generic;
namespace ARMeilleure.Common
{
class BitMap : IEnumerable<int>
{
private const int IntSize = 32;
private const int IntMask = IntSize - 1;
private List<int> _masks;
public BitMap(int initialCapacity)
{
int count = (initialCapacity + IntMask) / IntSize;
_masks = new List<int>(count);
while (count-- > 0)
{
_masks.Add(0);
}
}
public bool Set(int bit)
{
EnsureCapacity(bit + 1);
int wordIndex = bit / IntSize;
int wordBit = bit & IntMask;
int wordMask = 1 << wordBit;
if ((_masks[wordIndex] & wordMask) != 0)
{
return false;
}
_masks[wordIndex] |= wordMask;
return true;
}
public void Clear(int bit)
{
EnsureCapacity(bit + 1);
int wordIndex = bit / IntSize;
int wordBit = bit & IntMask;
int wordMask = 1 << wordBit;
_masks[wordIndex] &= ~wordMask;
}
public bool IsSet(int bit)
{
EnsureCapacity(bit + 1);
int wordIndex = bit / IntSize;
int wordBit = bit & IntMask;
return (_masks[wordIndex] & (1 << wordBit)) != 0;
}
public bool Set(BitMap map)
{
EnsureCapacity(map._masks.Count * IntSize);
bool modified = false;
for (int index = 0; index < _masks.Count; index++)
{
int newValue = _masks[index] | map._masks[index];
if (_masks[index] != newValue)
{
_masks[index] = newValue;
modified = true;
}
}
return modified;
}
public bool Clear(BitMap map)
{
EnsureCapacity(map._masks.Count * IntSize);
bool modified = false;
for (int index = 0; index < _masks.Count; index++)
{
int newValue = _masks[index] & ~map._masks[index];
if (_masks[index] != newValue)
{
_masks[index] = newValue;
modified = true;
}
}
return modified;
}
private void EnsureCapacity(int size)
{
while (_masks.Count * IntSize < size)
{
_masks.Add(0);
}
}
public IEnumerator<int> GetEnumerator()
{
for (int index = 0; index < _masks.Count; index++)
{
int mask = _masks[index];
while (mask != 0)
{
int bit = BitUtils.LowestBitSet(mask);
mask &= ~(1 << bit);
yield return index * IntSize + bit;
}
}
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
}
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