---
title: FlattenCollectionIndex
framework: swift
role: symbol
role_heading: Type Alias
path: swift/flattencollectionindex
---

# FlattenCollectionIndex

## Declaration

```swift
typealias FlattenCollectionIndex<T> = FlattenCollection<T>.Index where T : Collection, T.Element : Collection
```

## See Also

### Deprecated Type Aliases

- [ArrayLiteralConvertible](swift/arrayliteralconvertible.md)
- [BidirectionalIndexable](swift/bidirectionalindexable.md)
- [BidirectionalSlice](swift/bidirectionalslice.md)
- [BooleanLiteralConvertible](swift/booleanliteralconvertible.md)
- [ClosedRangeIndex](swift/closedrangeindex.md)
- [CustomPlaygroundQuickLookable](swift/customplaygroundquicklookable.md)
- [DefaultBidirectionalIndices](swift/defaultbidirectionalindices.md)
- [DefaultRandomAccessIndices](swift/defaultrandomaccessindices.md)
- [DictionaryIterator](swift/dictionaryiterator.md)
- [DictionaryLiteralConvertible](swift/dictionaryliteralconvertible.md)
- [EmptyIterator](swift/emptyiterator.md)
- [ExtendedGraphemeClusterLiteralConvertible](swift/extendedgraphemeclusterliteralconvertible.md)
- [FlattenBidirectionalCollectionIndex](swift/flattenbidirectionalcollectionindex.md)
- [FlattenBidirectionalCollection](swift/flattenbidirectionalcollection.md)
- [FloatLiteralConvertible](swift/floatliteralconvertible.md)