C and C++ in same header file?

In other C files I've seen things like:

```h
#ifdef __cplusplus
extern "C" {
#endif

void hello_world(char *greeting);

#ifdef __cplusplus
}
#endif
```

Example: https://github.com/xiallc/PixieSDK/blob/master/sdk/include/pixie16/pixie16.h

Maybe cbindgen could do that?