Type Alias MSGCALLRELEASE 

pub type MSGCALLRELEASE = Option<unsafe extern "system" fn(ulcallerdata: u32, lpmessage: Ref<'_, IMessage>)>;

Aliased Type

pub enum MSGCALLRELEASE {
    None,
    Some(unsafe extern "system" fn(u32, Ref<'_, IMessage>)),
}

Variants

None

No value.

Some(unsafe extern "system" fn(u32, Ref<'_, IMessage>))

Some value of type T.