---
title: MutableSpan.BorrowingIterator
framework: swift
role: symbol
role_heading: Type Alias
path: swift/mutablespan/borrowingiterator
---

# MutableSpan.BorrowingIterator

A type that provides the sequence’s iteration interface and encapsulates its iteration state.

## Declaration

```swift
typealias BorrowingIterator = SpanIterator<Element>
```