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Updates rest of the random list (#197)

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Kamron Batman 2020-08-22 00:23:51 -07:00 • committed by GitHub
parent 4403d6c1c7
commit 8caf5a422f
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18 changed files with 116 additions and 79 deletions
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65
Projects/Server/Utilities/Utility.cs
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@ -849,23 +849,80 @@ namespace Server
return total + bonus;
}
public static void Shuffle<T>(IList<T> list)
public static void Shuffle<T>(this IList<T> list)
{
var count = list.Count;
for (var i = count - 1; i > 0; i--)
for (var i = 0; i < count; i++)
{
var r = RandomSources.Source.Next(count);
var r = RandomMinMax(i, count - 1);
var swap = list[r];
list[r] = list[i];
list[i] = swap;
}
}
public static void Shuffle<T>(this Span<T> list)
{
var count = list.Length;
for (var i = 0; i < count; i++)
{
var r = RandomMinMax(i, count - 1);
var swap = list[r];
list[r] = list[i];
list[i] = swap;
}
}
/**
* Gets a random sample from the source list.
* Not meant for unbounded lists. Does not shuffle or modify source.
*/
public static T[] RandomSample<T>(this T[] source, int count)
{
if (count <= 0) return Array.Empty<T>();
var length = source.Length;
Span<bool> list = stackalloc bool[length];
var sampleList = new T[count];
int i = 0;
do
{
var rand = Random(length);
if (!(list[rand] && (list[rand] = true)))
sampleList[i++] = source[rand];
} while (i < count);
return sampleList;
}
public static List<T> RandomSample<T>(this List<T> source, int count)
{
if (count <= 0) return new List<T>();
var length = source.Count;
Span<bool> list = stackalloc bool[length];
var sampleList = new List<T>(count);
int i = 0;
do
{
var rand = Random(length);
if (!(list[rand] && (list[rand] = true)))
sampleList[i++] = source[rand];
} while (i < count);
return sampleList;
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T RandomList<T>(params T[] list) => list.RandomElement();
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T RandomElement<T>(this IList<T> list) => list.Count == 0 ? default : list[Random(list.Count)];
public static T RandomElement<T>(this IList<T> list) => list.RandomElement(default);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static T RandomElement<T>(this IList<T> list, T valueIfZero) => list.Count == 0 ? valueIfZero : list[Random(list.Count)];
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static bool RandomBool() => RandomSources.Source.NextBool();