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# vDSP_biquadm_CopyStateD

Copies the filter state from one double-precision multichannel biquadratic IIR filter object to another.

```
extern void vDSP_biquadm_CopyStateD(vDSP_biquadm_SetupD __dest, const struct vDSP_biquadm_SetupStructD *__src);
```

## Discussion

This function is the same as <doc://com.apple.documentation/documentation/kernel/1579980-vdsp_biquadm_copystate>, except for the types of the `src` and `dest` objects.

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