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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
namespace Roslyn.Utilities;
internal interface IBidirectionalMap<TKey, TValue>
{
bool IsEmpty { get; }
bool TryGetValue(TKey key, [MaybeNullWhen(false)] out TValue value);
bool TryGetKey(TValue value, [MaybeNullWhen(false)] out TKey key);
TValue? GetValueOrDefault(TKey key);
TKey? GetKeyOrDefault(TValue value);
bool ContainsKey(TKey key);
bool ContainsValue(TValue value);
IBidirectionalMap<TKey, TValue> RemoveKey(TKey key);
IBidirectionalMap<TKey, TValue> RemoveValue(TValue value);
IBidirectionalMap<TKey, TValue> Add(TKey key, TValue value);
IEnumerable<TKey> Keys { get; }
IEnumerable<TValue> Values { get; }
}
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