public static ReadOnlySequence <T> Create <T>(IEnumerable <ReadOnlyMemory <T> > source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (!source.Any())
{
return(ReadOnlySequence <T> .Empty);
}
var totalLength = source.Sum(s => s.Length);
var lastMemory = source.Last();
var remainMemories = source.Reverse().Skip(1);
CustomReadOnlySequenceSegment <T> firstSegment, lastSegment;
firstSegment = new CustomReadOnlySequenceSegment <T>(lastMemory, null, totalLength - lastMemory.Length);
lastSegment = firstSegment;
foreach (var currentElement in remainMemories)
{
firstSegment = new CustomReadOnlySequenceSegment <T>(currentElement, firstSegment, firstSegment.RunningIndex - currentElement.Length);
}
var sequence = new ReadOnlySequence <T>(firstSegment, 0, lastSegment, lastSegment.Memory.Length);
return(sequence);
}
public CustomReadOnlySequenceSegment(ReadOnlyMemory <T> memory, CustomReadOnlySequenceSegment <T>?next, long runningIndex)
{
this.Memory = memory;
this.Next = next;
this.RunningIndex = runningIndex;
}
