Type Alias WNDPROC 

pub type WNDPROC = Option<unsafe extern "system" fn(HWND, u32, WPARAM, LPARAM) -> LRESULT>;

Aliased Type

pub enum WNDPROC {
    None,
    Some(unsafe extern "system" fn(HWND, u32, WPARAM, LPARAM) -> LRESULT),
}

Variants

None

No value.

Some(unsafe extern "system" fn(HWND, u32, WPARAM, LPARAM) -> LRESULT)

Some value of type T.