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# PRFilePrivate
Layer-dependent implementation data.
## Syntax
```{code}
#include <prio.h>
typedef struct PRFilePrivate PRFilePrivate;
```
## Description
A layer implementer should collect all the private data of the layer in
the {ref}`PRFilePrivate` structure. Each layer has its own definition of
{ref}`PRFilePrivate`, which is hidden from other layers as well as from the
users of the layer.