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Why does it require double casting
Guys, the code below compiles fine:
&mut errhp_ctl as *mut *mut OCIError as *mut *mut c_void
but this code errors:
&mut errhp_ctl as *mut *mut c_void
errhp is of type *mut OCIError.
What I don't understand here is why do I have to cast it twice, not just straight to the target type that is c_void?
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