PriorityQueue api surface

PriorityQueue.cs

namespace System.Collections.Generic
{
    class PriorityQueue<TElement, TPriority> : IReadOnlyCollection<(TElement Element, TPriority Priority)>
    {
        #region Constructors
        public PriorityQueue() { }
        public PriorityQueue(IComparer<TPriority> comparer) { }
        public PriorityQueue(IEnumerable<(TElement Element, TPriority Priority)> values) { }
        public PriorityQueue(IEnumerable<(TElement Element, TPriority Priority)> values, IComparer<TPriority> comparer) { }
        #endregion

        #region Specific APIs
        public IComparer<TPriority> Comparer { get { throw null; } }
        public TElement Dequeue() { throw null; }
        public void Enqueue(TElement item, TPriority priority) { }
        public TElement Peek() { throw null; }
        public bool TryDequeue(out TElement item) { throw null; }
        public bool TryPeek(out TElement item) { throw null; }
        #endregion
        
        #region IReadOnlyCollection
        public int Count { get { throw null; } }
        public IEnumerator GetEnumerator() { throw null; } 
        #endregion
        
        #region Enumerator
        public struct Enumerator : IEnumerator<(TElement Element, TPriority Priority)>, IEnumerator, IDisposable
        {
            public (TElement Element, TPriority Priority) Current { get { throw null; } }
            object System.Collections.IEnumerator.Current { get { throw null; } }
            public void Dispose() { }
            public bool MoveNext() { throw null; }
            void System.Collections.IEnumerator.Reset() { }
        }
        #endregion
    }
}