| public static XorCount ( OpenBitSet a, OpenBitSet b ) : long | ||
| a | OpenBitSet | |
| b | OpenBitSet | |
| return | long | |
internal virtual void DoRandomSets(int maxSize, int iter, int mode)
{
System.Collections.BitArray a0 = null;
OpenBitSet b0 = null;
for (int i = 0; i < iter; i++)
{
int sz = rand.Next(maxSize);
System.Collections.BitArray a = new System.Collections.BitArray(sz);
OpenBitSet b = new OpenBitSet(sz);
// test the various ways of setting bits
if (sz > 0)
{
int nOper = rand.Next(sz);
for (int j = 0; j < nOper; j++)
{
int idx;
idx = rand.Next(sz);
a.Set(idx, true);
b.FastSet(idx);
idx = rand.Next(sz);
a.Set(idx, false);
b.FastClear(idx);
idx = rand.Next(sz);
a.Set(idx, !a.Get(idx));
b.FastFlip(idx);
bool val = b.FlipAndGet(idx);
bool val2 = b.FlipAndGet(idx);
Assert.IsTrue(val != val2);
val = b.GetAndSet(idx);
Assert.IsTrue(val2 == val);
Assert.IsTrue(b.Get(idx));
if (!val)
{
b.FastClear(idx);
}
Assert.IsTrue(b.Get(idx) == val);
}
}
// test that the various ways of accessing the bits are equivalent
DoGet(a, b);
// {{dougsale-2.4.0}}
//
// Java's java.util.BitSet automatically grows as needed - i.e., when a bit is referenced beyond
// the size of the BitSet, an exception isn't thrown - rather, the set grows to the size of the
// referenced bit.
//
// System.Collections.BitArray does not have this feature, and thus I've faked it here by
// "growing" the array explicitly when necessary (creating a new instance of the appropriate size
// and setting the appropriate bits).
//
// test ranges, including possible extension
int fromIndex, toIndex;
fromIndex = rand.Next(sz + 80);
toIndex = fromIndex + rand.Next((sz >> 1) + 1);
// {{dougsale-2.4.0}}:
// The following commented-out, compound statement's 'for loop' implicitly grows the Java BitSets 'a'
// and 'aa' to the same cardinality as 'j+1' when 'a.Count < j+1' and 'fromIndex < toIndex':
//BitArray aa = (BitArray)a.Clone(); for (int j = fromIndex; j < toIndex; j++) aa.Set(j, !a.Get(j));
// So, if necessary, lets explicitly grow 'a' now; then 'a' and its clone, 'aa', will be of the required size.
if (a.Length < toIndex && fromIndex < toIndex)
{
System.Collections.BitArray tmp = new System.Collections.BitArray(toIndex, false);
for (int k = 0; k < a.Length; k++)
{
tmp.Set(k, a.Get(k));
}
a = tmp;
}
// {{dougsale-2.4.0}}: now we can invoke this statement without going 'out-of-bounds'
System.Collections.BitArray aa = (System.Collections.BitArray)a.Clone(); for (int j = fromIndex; j < toIndex; j++)
{
aa.Set(j, !a.Get(j));
}
OpenBitSet bb = (OpenBitSet)b.Clone(); bb.Flip(fromIndex, toIndex);
DoIterate(aa, bb, mode); // a problem here is from flip or doIterate
fromIndex = rand.Next(sz + 80);
toIndex = fromIndex + rand.Next((sz >> 1) + 1);
// {{dougsale-2.4.0}}:
// The following commented-out, compound statement's 'for loop' implicitly grows the Java BitSet 'aa'
// when 'a.Count < j+1' and 'fromIndex < toIndex'
//aa = (BitArray)a.Clone(); for (int j = fromIndex; j < toIndex; j++) aa.Set(j, false);
// So, if necessary, lets explicitly grow 'aa' now
if (a.Length < toIndex && fromIndex < toIndex)
{
aa = new System.Collections.BitArray(toIndex);
for (int k = 0; k < a.Length; k++)
{
aa.Set(k, a.Get(k));
}
}
else
{
aa = (System.Collections.BitArray)a.Clone();
}
for (int j = fromIndex; j < toIndex; j++)
{
aa.Set(j, false);
}
bb = (OpenBitSet)b.Clone(); bb.Clear(fromIndex, toIndex);
DoNextSetBit(aa, bb); // a problem here is from clear() or nextSetBit
fromIndex = rand.Next(sz + 80);
toIndex = fromIndex + rand.Next((sz >> 1) + 1);
// {{dougsale-2.4.0}}:
// The following commented-out, compound statement's 'for loop' implicitly grows the Java BitSet 'aa'
// when 'a.Count < j+1' and 'fromIndex < toIndex'
//aa = (BitArray)a.Clone(); for (int j = fromIndex; j < toIndex; j++) aa.Set(j, false);
// So, if necessary, lets explicitly grow 'aa' now
if (a.Length < toIndex && fromIndex < toIndex)
{
aa = new System.Collections.BitArray(toIndex);
for (int k = 0; k < a.Length; k++)
{
aa.Set(k, a.Get(k));
}
}
else
{
aa = (System.Collections.BitArray)a.Clone();
}
for (int j = fromIndex; j < toIndex; j++)
{
aa.Set(j, true);
}
bb = (OpenBitSet)b.Clone(); bb.Set(fromIndex, toIndex);
DoNextSetBit(aa, bb); // a problem here is from set() or nextSetBit
if (a0 != null)
{
Assert.AreEqual(a.Equals(a0), b.Equals(b0));
Assert.AreEqual(BitSetSupport.Cardinality(a), b.Cardinality());
// {{dougsale-2.4.0}}
//
// The Java code used java.util.BitSet, which grows as needed.
// When a bit, outside the dimension of the set is referenced,
// the set automatically grows to the necessary size. The
// new entries default to false.
//
// BitArray does not grow automatically and is not growable.
// Thus when BitArray instances of mismatched cardinality
// interact, we must first explicitly "grow" the smaller one.
//
// This growth is acheived by creating a new instance of the
// required size and copying the appropriate values.
//
//BitArray a_and = (BitArray)a.Clone(); a_and.And(a0);
//BitArray a_or = (BitArray)a.Clone(); a_or.Or(a0);
//BitArray a_xor = (BitArray)a.Clone(); a_xor.Xor(a0);
//BitArray a_andn = (BitArray)a.Clone(); for (int j = 0; j < a_andn.Count; j++) if (a0.Get(j)) a_andn.Set(j, false);
System.Collections.BitArray a_and;
System.Collections.BitArray a_or;
System.Collections.BitArray a_xor;
System.Collections.BitArray a_andn;
if (a.Length < a0.Length)
{
// the Java code would have implicitly resized 'a_and', 'a_or', 'a_xor', and 'a_andn'
// in this case, so we explicitly create a resized stand-in for 'a' here, allowing for
// a to keep its original size while 'a_and', 'a_or', 'a_xor', and 'a_andn' are resized
System.Collections.BitArray tmp = new System.Collections.BitArray(a0.Length, false);
for (int z = 0; z < a.Length; z++)
{
tmp.Set(z, a.Get(z));
}
a_and = (System.Collections.BitArray)tmp.Clone(); a_and.And(a0);
a_or = (System.Collections.BitArray)tmp.Clone(); a_or.Or(a0);
a_xor = (System.Collections.BitArray)tmp.Clone(); a_xor.Xor(a0);
a_andn = (System.Collections.BitArray)tmp.Clone(); for (int j = 0; j < a_andn.Length; j++)
{
if (a0.Get(j))
{
a_andn.Set(j, false);
}
}
}
else if (a.Length > a0.Length)
{
// the Java code would have implicitly resized 'a0' in this case, so
// we explicitly do so here:
System.Collections.BitArray tmp = new System.Collections.BitArray(a.Length, false);
for (int z = 0; z < a0.Length; z++)
{
tmp.Set(z, a0.Get(z));
}
a0 = tmp;
a_and = (System.Collections.BitArray)a.Clone(); a_and.And(a0);
a_or = (System.Collections.BitArray)a.Clone(); a_or.Or(a0);
a_xor = (System.Collections.BitArray)a.Clone(); a_xor.Xor(a0);
a_andn = (System.Collections.BitArray)a.Clone(); for (int j = 0; j < a_andn.Length; j++)
{
if (a0.Get(j))
{
a_andn.Set(j, false);
}
}
}
else
{
// 'a' and 'a0' are the same size, no explicit growing necessary
a_and = (System.Collections.BitArray)a.Clone(); a_and.And(a0);
a_or = (System.Collections.BitArray)a.Clone(); a_or.Or(a0);
a_xor = (System.Collections.BitArray)a.Clone(); a_xor.Xor(a0);
a_andn = (System.Collections.BitArray)a.Clone(); for (int j = 0; j < a_andn.Length; j++)
{
if (a0.Get(j))
{
a_andn.Set(j, false);
}
}
}
OpenBitSet b_and = (OpenBitSet)b.Clone(); Assert.AreEqual(b, b_and); b_and.And(b0);
OpenBitSet b_or = (OpenBitSet)b.Clone(); b_or.Or(b0);
OpenBitSet b_xor = (OpenBitSet)b.Clone(); b_xor.Xor(b0);
OpenBitSet b_andn = (OpenBitSet)b.Clone(); b_andn.AndNot(b0);
DoIterate(a_and, b_and, mode);
DoIterate(a_or, b_or, mode);
DoIterate(a_xor, b_xor, mode);
DoIterate(a_andn, b_andn, mode);
Assert.AreEqual(BitSetSupport.Cardinality(a_and), b_and.Cardinality());
Assert.AreEqual(BitSetSupport.Cardinality(a_or), b_or.Cardinality());
Assert.AreEqual(BitSetSupport.Cardinality(a_xor), b_xor.Cardinality());
Assert.AreEqual(BitSetSupport.Cardinality(a_andn), b_andn.Cardinality());
// test non-mutating popcounts
Assert.AreEqual(b_and.Cardinality(), OpenBitSet.IntersectionCount(b, b0));
Assert.AreEqual(b_or.Cardinality(), OpenBitSet.UnionCount(b, b0));
Assert.AreEqual(b_xor.Cardinality(), OpenBitSet.XorCount(b, b0));
Assert.AreEqual(b_andn.Cardinality(), OpenBitSet.AndNotCount(b, b0));
}
a0 = a;
b0 = b;
}
}