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Use Array.Reverse<T> in ImmutableArray<T>.Builder.Reverse #82629

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Feb 24, 2023
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Use Array.Reverse<T> in ImmutableArray<T>.Builder.Reverse #82629

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6 changes: 4 additions & 2 deletions ...System.Collections.Immutable/src/System/Collections/Immutable/ImmutableArray_1.Builder.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -919,10 +919,11 @@ public int LastIndexOf(T item, int startIndex, int count, IEqualityComparer<T>?
/// </summary>
public void Reverse()
{
#if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
Array.Reverse<T>(_elements, 0, _count);
#else
// The non-generic Array.Reverse is not used because it does not perform
// well for non-primitive value types.
// If/when a generic Array.Reverse<T> becomes available, the below code
// can be deleted and replaced with a call to Array.Reverse<T>.
int i = 0;
int j = _count - 1;
T[] array = _elements;
Expand All @@ -934,6 +935,7 @@ public void Reverse()
i++;
j--;
}
#endif
}

/// <summary>
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