IImmutableSet.cs

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using System.Collections.Generic;
 
namespace System.Collections.Immutable;
 
public interface IImmutableSet<T> : IReadOnlyCollection<T>, IEnumerable<T>, IEnumerable
{
    IImmutableSet<T> Clear();
 
    bool Contains(T value);
 
    IImmutableSet<T> Add(T value);
 
    IImmutableSet<T> Remove(T value);
 
    bool TryGetValue(T equalValue, out T actualValue);
 
    IImmutableSet<T> Intersect(IEnumerable<T> other);
 
    IImmutableSet<T> Except(IEnumerable<T> other);
 
    IImmutableSet<T> SymmetricExcept(IEnumerable<T> other);
 
    IImmutableSet<T> Union(IEnumerable<T> other);
 
    bool SetEquals(IEnumerable<T> other);
 
    bool IsProperSubsetOf(IEnumerable<T> other);
 
    bool IsProperSupersetOf(IEnumerable<T> other);
 
    bool IsSubsetOf(IEnumerable<T> other);
 
    bool IsSupersetOf(IEnumerable<T> other);
 
    bool Overlaps(IEnumerable<T> other);
}