Apologies if this has been asked before - couldn't find it on the list
archives or the wiki.

A library I'm using has an opaque struct (actually a pointer to a C++
object usable in pure C code), which is used in most of the functions
in the public C API. How should I represent this in ffi?

For example, the definition and a function using it:

typedef struct Music_Emu Music_Emu;

gme_err_t gme_open_file( const char path [], Music_Emu** out, int sample_rate );

Thanks,
Misty

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