pub type GtkAccelMapForeach = Option<unsafe extern "C" fn(gpointer, *const c_char, c_uint, GdkModifierType, gboolean)>;
pub enum GtkAccelMapForeach { None, Some(unsafe extern "C" fn(*mut c_void, *const i8, u32, u32, i32)), }
No value.
Some value of type T.
T