Type Alias MSGBOXCALLBACK 

pub type MSGBOXCALLBACK = Option<unsafe extern "C" fn(lpHelpInfo: LPHELPINFO)>;

Aliased Type

pub enum MSGBOXCALLBACK {
    None,
    Some(unsafe extern "C" fn(*mut tagHELPINFO)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut tagHELPINFO))

Some value of type T.