Type Alias CAPYIELDCALLBACK 

pub type CAPYIELDCALLBACK = Option<unsafe extern "system" fn(hwnd: HWND) -> LRESULT>;

Aliased Type

pub enum CAPYIELDCALLBACK {
    None,
    Some(unsafe extern "system" fn(*mut c_void) -> isize),
}

Variants

None

No value.

Some(unsafe extern "system" fn(*mut c_void) -> isize)

Some value of type T.