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ArrayHelpers.cs
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66 lines (58 loc) · 1.85 KB
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace Microsoft.ClearScript.Util
{
internal static class ArrayHelpers
{
public static void Iterate(this Array array, Action<int[]> action)
{
if (array.Rank > 0)
{
var dimensions = Enumerable.Range(0, array.Rank);
if (dimensions.Aggregate(1, (count, dimension) => count * array.GetLength(dimension)) > 0)
{
Iterate(array, new int[array.Rank], 0, action);
}
}
}
private static void Iterate(Array array, int[] indices, int dimension, Action<int[]> action)
{
if (dimension >= indices.Length)
{
action(indices);
}
else
{
var lowerBound = array.GetLowerBound(dimension);
var upperBound = array.GetUpperBound(dimension);
for (var index = lowerBound; index <= upperBound; index++)
{
indices[dimension] = index;
Iterate(array, indices, dimension + 1, action);
}
}
}
public static T[] GetEmptyArray<T>()
{
return EmptyArray<T>.Value;
}
public static async IAsyncEnumerable<T> AsAsyncEnumerable<T>(this T[] array)
{
foreach (var item in array)
{
await Task.CompletedTask;
yield return item;
}
}
#region Nested type: EmptyArray<T>
private static class EmptyArray<T>
{
public static readonly T[] Value = new T[0];
}
#endregion
}
}