---
title: Mach.SendOnceRight
framework: System
role: symbol
role_heading: Structure
platforms: [iOS 17.4+, iPadOS 17.4+, Mac Catalyst 17.4+, macOS 14.4+, tvOS 17.4+, visionOS 1.0+, watchOS 10.4+]
path: system/mach/sendonceright
---

# Mach.SendOnceRight

The MachPortRight type used to manage a send-once right.

## Declaration

```swift
@frozen struct SendOnceRight
```

## Overview

Overview Send-once rights are the most restrictive type of Mach port rights. They cannot create other rights, and are consumed upon use. Upon destruction a send-once notification will be sent to the receiving end.

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Copyable](swift/copyable.md)
- [MachPortRight](system/machportright.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)