Function rocks_sys::rocks_db_key_may_exist

pub unsafe extern "C" fn rocks_db_key_may_exist(
    db: *mut rocks_db_t, 
    options: *const rocks_readoptions_t, 
    key: *const c_char, 
    key_len: usize, 
    value: *mut c_void, 
    value_found: *mut c_uchar
) -> c_uchar