osu/osu.Game/Extensions/CollectionExtensions.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System.Collections.Generic;
namespace osu.Game.Extensions
{
public static class CollectionExtensions
{
public static void AddRange<T>(this ICollection<T> collection, IEnumerable<T> items)
{
// List<T> has a potentially more optimal path to adding a range.
if (collection is List<T> list)
list.AddRange(items);
else
{
foreach (T obj in items)
collection.Add(obj);
}
}
}
}