/// <summary>Sorts the specified array.</summary>
/// <param name="a">Array to be sorted.</param>
/// <param name="lo">the index of the first element in the range to be sorted.</param>
/// <param name="hi">the index after the last element in the range to be sorted.</param>
/// <param name="c">The comparator to determine the order of the sort.</param>
public static void Sort(IList <T> a, int lo, int hi, Comparison <T> c)
{
CheckRange(a.Count, lo, hi);
int width = hi - lo;
if (width < 2)
{
return; // Arrays of size 0 and 1 are always sorted
}
// If array is small, do a "mini-TimSort" with no merges
if (width < MIN_MERGE)
{
int initRunLength = CountRunAndMakeAscending(a, lo, hi, c);
BinarySort(a, lo, hi, lo + initRunLength, c);
return;
}
// March over the array once, left to right, finding natural runs,
// extending short natural runs to minRun elements, and merging runs
// to maintain stack invariant.
var sorter = new ListTimSort <T>(a, c);
int minRun = GetMinimumRunLength(width);
do
{
// Identify next run
int runLen = CountRunAndMakeAscending(a, lo, hi, c);
// If run is short, extend to min(minRun, nRemaining)
if (runLen < minRun)
{
int force = width <= minRun ? width : minRun;
BinarySort(a, lo, lo + force, lo + runLen, c);
runLen = force;
}
// Push run onto pending-run stack, and maybe merge
sorter.PushRun(lo, runLen);
sorter.MergeCollapse();
// Advance to find next run
lo += runLen;
width -= runLen;
} while (width != 0);
// Merge all remaining runs to complete sort
Debug.Assert(lo == hi);
sorter.MergeForceCollapse();
Debug.Assert(sorter.m_StackSize == 1);
}
public void Test_Common()
{
Assert.Throws(typeof(ArgumentNullException), () => { SortHelper.QuickSort <ValItem>(null, null); });
Assert.Throws(typeof(ArgumentNullException), () => { SortHelper.MergeSort <ValItem>(null, null); });
Assert.Throws(typeof(ArgumentNullException), () => { ListTimSort <int> .Sort(null, null); });
Random rnd = new Random();
List <ValItem> listQS = new List <ValItem>();
List <ValItem> listMS = new List <ValItem>();
List <ValItem> listTS = new List <ValItem>();
List <ValItem> listCS = new List <ValItem>();
//const int MaxCount = 1000000; // for performance test
const int MaxCount = 1000; // for common test
for (int i = 0; i < MaxCount; i++)
{
double val = rnd.NextDouble();
listTS.Add(new ValItem(val));
listQS.Add(new ValItem(val));
listMS.Add(new ValItem(val));
listCS.Add(new ValItem(val));
}
listCS.Sort(CompareItems);
SortHelper.QuickSort(listQS, CompareItems);
SortHelper.MergeSort(listMS, CompareItems);
ListTimSort <ValItem> .Sort(listTS, CompareItems);
// test for sort valid
//(only for numbers, because some methods is with the permutations, and part - no)
for (int i = 0; i < MaxCount; i++)
{
Assert.AreEqual(listTS[i].Value, listQS[i].Value);
Assert.AreEqual(listQS[i].Value, listMS[i].Value);
Assert.AreEqual(listMS[i].Value, listCS[i].Value);
}
}