Movable Window on Span

ReadOnlyWindow.cs

#nullable enable

public ref struct ReadOnlyWindow<T>
{
    private readonly ReadOnlySpan<T> _data;
    private int _position;
    private readonly int Length { get; }
    public ReadOnlySpan<T> View => _data.Slice(_position, Length);

    public Window(ReadOnlySpan<T> data, int length)
    : this()
    {
        _data = data;
        Length = length;
    }

    public bool MoveRight()
    {
        if (_position + Length >= _data.Length)
            return false;
        _position++;
        return true;
    }

    public bool MoveLeft()
    {
        if (_position <= 0)
            return false;
        _position--;
        return true;
    }
}

Window.cs

#nullable enable

public ref struct Window<T>
{
    private readonly Span<T> _data;
    private int _position;
    private readonly int Length { get; }
    public Span<T> View => _data.Slice(_position, Length);

    public Window(Span<T> data, int length)
    : this()
    {
        _data = data;
        Length = length;
    }

    public bool MoveRight()
    {
        if (_position + Length >= _data.Length)
            return false;
        _position++;
        return true;
    }

    public bool MoveLeft()
    {
        if (_position <= 0)
            return false;
        _position--;
        return true;
    }
}