Function try_insert

publication/code/chapter10/cuckoofilter/src/lib.rs:76–82

尝试插入

(&mut self, elem: &T)

    // 尝试插入
    fn try_insert<T: ?Sized + Hash>(&mut self, elem: &T) -> Result<bool, CuckooError> {
        if self.contains(elem) {
            Ok(false)
        } else {
            self.insert(elem).map(|_| true)
        }
    }

    fn insert<T: ?Sized + Hash>(&mut self, elem: &T) -> Result<(), CuckooError> {
        let fai = FaI::from_data::<_, H>(elem)