pub type PFNGETPROFILEPATHW = Option<unsafe extern "C" fn(pszUsername: LPCWSTR, pszBuffer: LPWSTR, cbBuffer: UINT) -> UINT>;
pub enum PFNGETPROFILEPATHW { None, Some(unsafe extern "C" fn(*const u16, *mut u16, u32) -> u32), }
No value.
Some value of type T.
T