Type Alias PNEEDLE_UPDATE_CALLBACK 

pub type PNEEDLE_UPDATE_CALLBACK = Option<unsafe extern "C" fn(arg1: PELEMENT_NEEDLE) -> FLOAT64>;

Aliased Type

pub enum PNEEDLE_UPDATE_CALLBACK {
    None,
    Some(unsafe extern "C" fn(*mut ELEMENT_NEEDLE) -> f64),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*mut ELEMENT_NEEDLE) -> f64)

Some value of type T.