---
title: "init(implementation:)"
framework: network
role: symbol
role_heading: Initializer
path: "network/nwprotocolframer/definition/init(implementation:)"
---

# init(implementation:)

Initializes a new protocol definition based on your protocol implementation.

## Declaration

```swift
init(implementation: any NWProtocolFramerImplementation.Type)
```

## Discussion

Discussion Each time you initialize a protocol definition with your implemention, a new definition is created that will not be considered equal to other definitions. If you need to associate messages with a protocol you have added to a connection’s protocol stack, make sure to use the same definition.