C# Circular Buffer

CircularBuffer.cs

public sealed class CircularBuffer<T>(int capacity = 64) : IReadOnlyList<T>
    where T : notnull
{
    readonly T[] elements = new T[capacity];
    int head, tail;

    public int Capacity => elements.Length;
    public int Length { get; private set; }

    public void Clear()
    {
        head = tail;
        Array.Clear(elements, 0, elements.Length);
        Length = 0;
    }

    public ref T this[int idx] => ref elements[(tail + idx) % Capacity];

    int IReadOnlyCollection<T>.Count => Length;

    T IReadOnlyList<T>.this[int idx] => elements[(tail + idx) % Capacity];

    public ref T Pop()
    {
        ref var value = ref Peek();

        tail = (tail + 1) % Capacity;
        Length--;

        return ref value;
    }
    
    public void MoveTo(int index) {
        Length = Math.Abs(index - head);
        head = index % Capacity;
    }
    
    public void Advance()
    {
        head = (head + 1) % Capacity;
        Length++;
    }

    public ref T Peek() => ref elements[head];


    public void Push(in T val)
    {
        Peek() = val;
        Advance();
    }

    public override string ToString() => $"[{string.Join(',', this)}]";


    public IEnumerator<T> GetEnumerator()
    {
        for (var i = 0; i < Length; i++)
            yield return this[i];
    }

    IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
}