private static void IntroSort(SegmentedArraySegment <T> keys, int depthLimit, Comparison <T> comparer)
{
LorettaDebug.Assert(keys.Length > 0);
LorettaDebug.Assert(depthLimit >= 0);
LorettaDebug.Assert(comparer != null);
int partitionSize = keys.Length;
while (partitionSize > 1)
{
if (partitionSize <= SegmentedArrayHelper.IntrosortSizeThreshold)
{
if (partitionSize == 2)
{
SwapIfGreater(keys, comparer, 0, 1);
return;
}
if (partitionSize == 3)
{
SwapIfGreater(keys, comparer, 0, 1);
SwapIfGreater(keys, comparer, 0, 2);
SwapIfGreater(keys, comparer, 1, 2);
return;
}
InsertionSort(keys[..partitionSize], comparer);
internal static void IntrospectiveSort(SegmentedArraySegment <T> keys, Comparison <T> comparer)
{
LorettaDebug.Assert(comparer != null);
if (keys.Length > 1)
{
IntroSort(keys, 2 * (SegmentedArraySortUtils.Log2((uint)keys.Length) + 1), comparer);
}
}
private static void SwapIfGreater(SegmentedArraySegment <T> keys, Comparison <T> comparer, int i, int j)
{
LorettaDebug.Assert(i != j);
if (comparer(keys[i], keys[j]) > 0)
{
(keys[j], keys[i]) = (keys[i], keys[j]);
}
}
internal static void Sort(SegmentedArraySegment <T> keys, Comparison <T> comparer)
{
LorettaDebug.Assert(comparer != null, "Check the arguments in the caller!");
// Add a try block here to detect bogus comparisons
try
{
IntrospectiveSort(keys, comparer);
}
catch (IndexOutOfRangeException)
{
ThrowHelper.ThrowArgumentException_BadComparer(comparer);
}
catch (Exception e)
{
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_IComparerFailed, e);
}
}
public static void Sort(SegmentedArraySegment <T> keys, IComparer <T>?comparer)
{
// Add a try block here to detect IComparers (or their
// underlying IComparables, etc) that are bogus.
try
{
comparer ??= Comparer <T> .Default;
IntrospectiveSort(keys, comparer.Compare);
}
catch (IndexOutOfRangeException)
{
ThrowHelper.ThrowArgumentException_BadComparer(comparer);
}
catch (Exception e)
{
ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_IComparerFailed, e);
}
}
private static void Swap(SegmentedArraySegment <T> a, int i, int j)
{
LorettaDebug.Assert(i != j);
(a[j], a[i]) = (a[i], a[j]);
}