---
title: FFTSetupD
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.13+]
path: kernel/fftsetupd
---

# FFTSetupD

An opaque type that contains setup information for a given double-precision FFT transform.

## Declaration

```occ
typedef struct OpaqueFFTSetupD *FFTSetupD;
```

## Discussion

Discussion A setup object can be allocated with vDSP_create_fftsetupD and destroyed with vDSP_destroy_fftsetupD. The setup object includes, among other things, precomputed tables used in computing an FFT of the specified size.