Verified Commit 4701f937 authored by LeoFun01's avatar LeoFun01

Add `Inverse` extension method for `ISet<T>`.

parent 55429a1e
......@@ -12,6 +12,11 @@ private sealed class InternalSet<T> : ISet<T>
public bool Contains(T item) { return _contains(item); }
public static ISet<T> Inverse<T>(this ISet<T> _this)
where T : IEquatable<T>
return new InternalSet<T>(e => !_this.Contains(e));
public static ISet<T> Union<T>(this ISet<T> _this, ISet<T> other)
where T : IEquatable<T>
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