pub type PIMAGE_TLS_CALLBACK = Option<unsafe extern "system" fn(DllHandle: PVOID, Reason: DWORD, Reserved: PVOID)>;
enum PIMAGE_TLS_CALLBACK { None, Some(unsafe extern "system" fn(_: *mut c_void, _: u32, _: *mut c_void)), }
No value.
Some value of type T.
T