public void Value_HashCheck()
{
byte partitionBits = 1;
int id = 1253432;
// Get Value, Hash, and Partition Index
Value idValue = Value.Create(id);
int hash = idValue.GetHashCode();
int partition = PartitionMask.IndexOfHash(hash, partitionBits);
// Verify Matches reports consistently with IndexOfHash
PartitionMask mask = PartitionMask.BuildSet(partitionBits)[partition];
string maskName = mask.ToString();
Assert.IsTrue(mask.Matches(hash));
// Verify Value.Assign hash is consistent
Value n = Value.Create(null);
n.Assign(id);
int hashViaAssign = n.GetHashCode();
Assert.AreEqual(hash, hashViaAssign);
// Get Hash of unwrapped value [debuggability]
int wrongHash = id.GetHashCode();
int wrongPartition = PartitionMask.IndexOfHash(wrongHash, partitionBits);
}
public void PartitionMask_Basic()
{
PartitionMask mask = PartitionMask.All;
// Verify 'All' is count zero, value zero
Assert.AreEqual(0, mask.BitCount);
Assert.AreEqual(0, mask.Value);
// Everything matches a zero-width mask
mask.BitCount = 0;
Assert.IsTrue(mask.Matches(0));
Assert.IsTrue(mask.Matches(~0));
Assert.AreEqual("", mask.ToString());
// 1* should match values starting with 0x8 only
mask.BitCount = 1;
mask.Value = (0x1 << 31);
Assert.IsFalse(mask.Matches(0));
Assert.IsTrue(mask.Matches(~0));
Assert.IsTrue(mask.Matches(unchecked ((int)0x80000000)));
Assert.IsFalse(mask.Matches(0x7FFFFFFF));
Assert.AreEqual("1", mask.ToString());
// 0* should match values without the first bit set
mask.BitCount = 1;
mask.Value = 0;
Assert.IsTrue(mask.Matches(0));
Assert.IsFalse(mask.Matches(~0));
Assert.IsFalse(mask.Matches(unchecked ((int)0x80000000)));
Assert.IsTrue(mask.Matches(0x7FFFFFFF));
Assert.AreEqual("0", mask.ToString());
// 11* should match values with the first two bits
mask.BitCount = 2;
mask.Value = (0x3 << 30);
Assert.IsFalse(mask.Matches(0));
Assert.IsTrue(mask.Matches(~0));
Assert.IsFalse(mask.Matches(unchecked ((int)0x80000000)));
Assert.IsTrue(mask.Matches(unchecked ((int)0xC0000000)));
Assert.IsTrue(mask.Matches(unchecked ((int)0xE0000000)));
Assert.IsFalse(mask.Matches(0x7FFFFFFF));
Assert.AreEqual("11", mask.ToString());
// 1101* should match values with the first four bits
mask.BitCount = 4;
mask.Value = (0xD << 28);
Assert.IsFalse(mask.Matches(0));
Assert.IsFalse(mask.Matches(~0));
Assert.IsFalse(mask.Matches(unchecked ((int)0xC0000000)));
Assert.IsTrue(mask.Matches(unchecked ((int)0xD0000000)));
Assert.IsTrue(mask.Matches(unchecked ((int)0xD7777777)));
Assert.IsFalse(mask.Matches(unchecked ((int)0xE0000000)));
Assert.IsFalse(mask.Matches(unchecked ((int)0xF0000000)));
Assert.IsFalse(mask.Matches(unchecked ((int)0x7FFFFFFF)));
Assert.AreEqual("1101", mask.ToString());
// Verify 'All' has not been altered by copy/use
Assert.AreEqual(0, PartitionMask.All.BitCount);
Assert.AreEqual(0, PartitionMask.All.Value);
}