private SequenceSegment GetSegment()

in src/Common/SequenceOfT.cs [230:271]
37 lines of code
11 McCabe index (conditional complexity)

        private SequenceSegment GetSegment(int sizeHint)
        {
            if (sizeHint < 0)
            {
                throw new ArgumentOutOfRangeException(nameof(sizeHint));
            }

            int? minBufferSize = null;
            if (sizeHint == 0)
            {
                if (this.last == null || this.last.WritableBytes == 0)
                {
                    // We're going to need more memory. Take whatever size the pool wants to give us.
                    minBufferSize = -1;
                }
            }
            else
            {
                sizeHint = Math.Max(this.MinimumSpanLength, sizeHint);
                if (this.last == null || this.last.WritableBytes < sizeHint)
                {
                    minBufferSize = sizeHint;
                }
            }

            if (minBufferSize.HasValue)
            {
                var segment = this.segmentPool.Count > 0 ? this.segmentPool.Pop() : new SequenceSegment();
                if (this.arrayPool != null)
                {
                    segment.Assign(this.arrayPool.Rent(minBufferSize.Value == -1 ? DefaultLengthFromArrayPool : minBufferSize.Value));
                }
                else
                {
                    segment.Assign(this.memoryPool!.Rent(minBufferSize.Value));
                }

                this.Append(segment);
            }

            return this.last!;
        }