Type Alias GEOSDistanceCallback 

pub type GEOSDistanceCallback = Option<unsafe extern "C" fn(item1: *const c_void, item2: *const c_void, distance: *mut c_double, userdata: *mut c_void) -> c_int>;

Aliased Type

pub enum GEOSDistanceCallback {
    None,
    Some(unsafe extern "C" fn(*const c_void, *const c_void, *mut f64, *mut c_void) -> i32),
}

Variants

None

No value.

Some(unsafe extern "C" fn(*const c_void, *const c_void, *mut f64, *mut c_void) -> i32)

Some value of type T.