wrapper

    class PtrAsArrayWrapper<T> : IEnumerable<T> where T : unmanaged
    {
        private LargeIntPtr Ptr { get; set; }
        long _count;
        private unsafe T* data;
        public long Count
        {
            get => _count;
        }

        public PtrAsArrayWrapper(LargeIntPtr ptr)
        {
            this.Ptr = ptr;
            _count = ptr.Size / System.Runtime.InteropServices.Marshal.SizeOf(typeof(T));

            unsafe
            {
                data = (T*) Ptr.Ptr.ToPointer();
            }
        }

        public T this[long index]
        {
            get
            {
                unsafe
                {
                    return *(data + index);
                }
            }

            set
            {
                unsafe
                {
                    *(data + index) = value;
                }
            }
        }


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

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
    }