public static IEnumerable <TSource> HeapSort <TSource>(this IEnumerable <TSource> source, bool descending = false)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
var heap = Heap1.Create(source, descending);
while (heap.Any)
{
yield return(heap.Pop());
}
}
public void SortDescending()
{
var values = RandomHelper.CreateData(100000);
var actual = TimeHelper.Measure(() => Heap1.Create(values, true));
var a = new int[values.Length];
TimeHelper.Measure(() => { for (var i = 0; i < a.Length; i++, actual.Pop())
{
a[i] = actual.First;
}
});
var e = TimeHelper.Measure(() => values.OrderByDescending(x => x).ToArray());
CollectionAssert.AreEqual(e, a);
}
public void SortDescending_String()
{
var values = RandomHelper.CreateData(100000);
var actual = TimeHelper.Measure(() => Heap1.Create(x => x.ToString(), values, true));
var a = new List <int>();
TimeHelper.Measure(() => { while (actual.Any)
{
a.Add(actual.Pop());
}
});
var e = TimeHelper.Measure(() => values.OrderByDescending(x => x.ToString()).ToArray());
CollectionAssert.AreEqual(e, a);
}
public void Sort()
{
var values = RandomHelper.CreateData(100000);
var actual = TimeHelper.Measure(() => Heap1.Create(values));
var a = new int[values.Length];
TimeHelper.Measure(() => { for (var i = 0; i < a.Length; i++)
{
a[i] = actual.Pop();
}
});
var e = (int[])values.Clone();
TimeHelper.Measure(() => Array.Sort(e));
CollectionAssert.AreEqual(e, a);
}
public static IEnumerable <TSource> HeapSort <TSource, TKey>(this IEnumerable <TSource> source, Func <TSource, TKey> keySelector, bool descending = false)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (keySelector == null)
{
throw new ArgumentNullException(nameof(keySelector));
}
var heap = Heap1.Create(v => v.k, source.Select(o => (o: o, k: keySelector(o))), descending);
while (heap.Any)
{
yield return(heap.Pop().o);
}
}