public void SequencePositionOfMultiSegment()
        {
            var(first, last) = BufferList.Create(
                new byte[] { 1, 2 },
                new byte[] { 3, 4 }
                );
            var bytes = new ReadOnlySequence <byte>(first, 0, last, last.Memory.Length);

            Assert.Equal(4, bytes.Length);

            // Static method call to avoid calling instance methods
            Assert.False(Sequence.PositionOf(bytes, 0).HasValue);

            for (int i = 0; i < bytes.Length; i++)
            {
                var value = (byte)(i + 1);

                var listPosition = MemoryListExtensions.PositionOf(first, value).GetValueOrDefault();
                var(node, index) = listPosition.Get <IMemoryList <byte> >();

                if (listPosition != default)
                {
                    Assert.Equal(value, node.Memory.Span[index]);
                }

                var robPosition         = BuffersExtensions.PositionOf(bytes, value);
                var robSequencePosition = Sequence.PositionOf(bytes, value);

                Assert.Equal(listPosition, robPosition);
                Assert.Equal(listPosition, robSequencePosition);

                var robSlice = bytes.Slice(1);
                robPosition         = BuffersExtensions.PositionOf(robSlice, value);
                robSequencePosition = Sequence.PositionOf(robSlice, value);

                if (i > 0)
                {
                    Assert.Equal(listPosition, robPosition);
                    Assert.Equal(listPosition, robSequencePosition);
                }
                else
                {
                    Assert.False(robPosition.HasValue);
                    Assert.False(robSequencePosition.HasValue);
                }

                if (listPosition != default)
                {
                    robSlice = bytes.Slice(listPosition);
                    Assert.Equal(value, robSlice.First.Span[0]);
                }
            }
        }
        public void SequencePositionOfMultiSegment()
        {
            var(first, last) = MemoryList.Create(
                new byte[] { 1, 2 },
                new byte[] { 3, 4 }
                );
            var bytes = new ReadOnlyBytes(first, last);

            Assert.Equal(4, bytes.Length);

            // Static method call to avoid calling instance methods
            Assert.Equal(Position.End, Sequence.PositionOf(bytes, 0));

            for (int i = 0; i < bytes.Length; i++)
            {
                var value = (byte)(i + 1);

                var listPosition = MemoryListExtensions.PositionOf(first, value);
                var(node, index) = listPosition.Get <IMemoryList <byte> >();

                if (!listPosition.IsEnd)
                {
                    Assert.Equal(value, node.Memory.Span[index]);
                }

                var robPosition         = bytes.PositionOf(value);
                var robSequencePosition = Sequence.PositionOf(bytes, value);

                Assert.Equal(listPosition, robPosition);
                Assert.Equal(listPosition, robSequencePosition);

                var robSlice = bytes.Slice(1);
                robPosition         = robSlice.PositionOf(value);
                robSequencePosition = Sequence.PositionOf(robSlice, value);

                if (i > 0)
                {
                    Assert.Equal(listPosition, robPosition);
                    Assert.Equal(listPosition, robSequencePosition);
                }
                else
                {
                    Assert.Equal(Position.End, robPosition);
                    Assert.Equal(Position.End, robSequencePosition);
                }

                if (listPosition != Position.End)
                {
                    robSlice = bytes.Slice(listPosition);
                    Assert.Equal(value, robSlice.Memory.Span[0]);
                }
            }
        }
        public void SequencePositionOfMultiSegment()
        {
            var(first, last) = BufferList.Create(
                new byte[] { 1, 2 },
                new byte[] { 3, 4 }
                );
            var bytes = new ReadOnlySequence <byte>(first, 0, last, last.Memory.Length);

            Assert.Equal(4, bytes.Length);

            // Static method call to avoid calling instance methods
            Assert.False(Sequence.PositionOf(bytes, 0).HasValue);

            for (int i = 0; i < bytes.Length; i++)
            {
                var value = (byte)(i + 1);

                var listPosition = MemoryListExtensions.PositionOf(first, value).GetValueOrDefault();
                var(node, index) = listPosition.Get <ReadOnlySequenceSegment <byte> >();

                if (listPosition.Equals(default))