Type Alias GEOSMessageHandler_r 

pub type GEOSMessageHandler_r = Option<unsafe extern "C" fn(message: *const c_char, userdata: *mut c_void)>;

Aliased Type

pub enum GEOSMessageHandler_r {
    None,
    Some(unsafe extern "C" fn(*const i8, *mut c_void)),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const i8, *mut c_void))

Some value of type T.