/// <summary>
/// Provides an implementation of <see cref="ISet{T}.IsSubsetOf"/>.
/// </summary>
/// <typeparam name="T">The type of values in the collections.</typeparam>
/// <param name="source">The source collection that is implementing <see cref="ISet{T}"/>.</param>
/// <param name="other">The other enumerable.</param>
/// <param name="comparer">The comparer.</param>
/// <returns>The result of <see cref="ISet{T}.IsSubsetOf"/>.</returns>
/// <remarks>
/// <para>
/// From <see href="https://msdn.microsoft.com/en-us/library/dd412074(v=vs.110).aspx"/>;
/// Determines whether a set is a subset of a specified collection.
/// </para><para>
/// If other contains the same elements as the current set, the current set is still considered a
/// subset of other.
/// </para><para>
/// This method always returns false if the current set has elements that are not in other.
/// </para>
/// </remarks>
public static bool IsSubsetOf <T>(ISet <T> source, IEnumerable <T> other, IEqualityComparer <T> comparer)
{
Contracts.Requires.That(source != null);
Contracts.Requires.That(comparer != null);
ISetContracts.IsSubsetOf(other);
return(IsSubsetOf(source, other as HashSet <T> ?? new HashSet <T>(other, comparer)));
}
/// <summary>
/// Provides an implementation of <see cref="ISet{T}.IsSubsetOf"/>.
/// </summary>
/// <typeparam name="T">The type of values in the collections.</typeparam>
/// <param name="source">The source collection that is implementing <see cref="ISet{T}"/>.</param>
/// <param name="other">The other enumerable.</param>
/// <returns>The result of <see cref="ISet{T}.IsSubsetOf"/>.</returns>
/// <remarks>
/// <para>
/// From <see href="https://msdn.microsoft.com/en-us/library/dd412074(v=vs.110).aspx"/>;
/// Determines whether a set is a subset of a specified collection.
/// </para><para>
/// If other contains the same elements as the current set, the current set is still considered a
/// subset of other.
/// </para><para>
/// This method always returns false if the current set has elements that are not in other.
/// </para>
/// </remarks>
public static bool IsSubsetOf <T>(ISet <T> source, HashSet <T> other)
{
Contracts.Requires.That(source != null);
ISetContracts.IsSubsetOf(other);
if (source.Count > other.Count)
{
return(false);
}
return(source.All(other.Contains));
}
/// <inheritdoc />
public bool IsSubsetOf(IEnumerable <IDisposable> other)
{
ISetContracts.IsSubsetOf(other);
return(this.disposables.IsSubsetOf(other));
}
