---
title: Indices
framework: swift
role: symbol
role_heading: Associated Type
path: swift/collection/indices-swift.associatedtype
---

# Indices

A type that represents the indices that are valid for subscripting the collection, in ascending order.

## Declaration

```swift
associatedtype Indices : Collection = DefaultIndices<Self> where Self.Indices == Self.Indices.SubSequence
```