Type Alias MFPERIODICCALLBACK 

pub type MFPERIODICCALLBACK = Option<unsafe extern "system" fn(pcontext: Ref<'_, IUnknown>)>;

Aliased Type

pub enum MFPERIODICCALLBACK {
    None,
    Some(unsafe extern "system" fn(Ref<'_, IUnknown>)),
}

Variants

None

No value.

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

Some value of type T.