---
title: CombineIdentifier
framework: combine
role: symbol
role_heading: Structure
path: combine/combineidentifier
---

# CombineIdentifier

A unique identifier for identifying publisher streams.

## Declaration

```swift
struct CombineIdentifier
```

## Overview

Overview To conform to CustomCombineIdentifierConvertible in a Subscription or Subject that you implement as a structure, create an instance of CombineIdentifier as follows: let combineIdentifier = CombineIdentifier()

## Topics

### Creating a Combine identifier

- [init()](combine/combineidentifier/init().md)
- [init(_:)](combine/combineidentifier/init(_:).md)

### Providing a description

- [description](combine/combineidentifier/description.md)

## Relationships

### Conforms To

- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)

## See Also

### Debugging Identifiers

- [CustomCombineIdentifierConvertible](combine/customcombineidentifierconvertible.md)