pub type FMOD_CODEC_FREE_FUNC = Option<unsafe extern "C" fn(ptr: *mut c_void, file: *const c_char, line: c_int)>;
pub enum FMOD_CODEC_FREE_FUNC { None, Some(unsafe extern "C" fn(*mut c_void, *const i8, i32)), }
No value.
Some value of type T.
T