Function leveldb_sys::leveldb_comparator_create

pub unsafe extern "C" fn leveldb_comparator_create(
    state: *mut c_void, 
    destructor: extern "C" fn(_: *mut c_void), 
    compare: extern "C" fn(_: *mut c_void, _: *const c_char, _: size_t, _: *const c_char, _: size_t) -> c_int, 
    name: extern "C" fn(_: *mut c_void) -> *const c_char
) -> *mut leveldb_comparator_t