---
title: PHASENumericPair
framework: phase
role: symbol
role_heading: Class
path: phase/phasenumericpair
---

# PHASENumericPair

An ordered pair that defines a bounding box for an envelope.

## Declaration

```swift
class PHASENumericPair
```

## Overview

Overview A PHASEEnvelope object uses this class to bound the value of its range and domain.

## Topics

### Creating a Numeric Pair

- [init(firstValue:secondValue:)](phase/phasenumericpair/init(firstvalue:secondvalue:).md)

### Defining the Values

- [first](phase/phasenumericpair/first.md)
- [second](phase/phasenumericpair/second.md)

## Relationships

### Inherits From

- [NSObject](objectivec/nsobject-swift.class.md)

### Conforms To

- [CVarArg](swift/cvararg.md)
- [CustomDebugStringConvertible](swift/customdebugstringconvertible.md)
- [CustomStringConvertible](swift/customstringconvertible.md)
- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Dynamic Sound Control

- [PHASEEnvelope](phase/phaseenvelope.md)
- [PHASEEnvelopeSegment](phase/phaseenvelopesegment.md)
- [PHASECurveType](phase/phasecurvetype.md)
- [Playback Parameterization](phase/playback-parameterization.md)