pub type PFNGLWINDOWPOS3FARBPROC = Option<unsafe extern "C" fn(x: GLfloat, y: GLfloat, z: GLfloat)>;
enum PFNGLWINDOWPOS3FARBPROC { None, Some(unsafe extern "C" fn(_: f32, _: f32, _: f32)), }
No value.
Some value of type T.
T