Trait len_trait::len::Empty

pub trait Empty {
    fn is_empty(&self) -> bool;
}

A trait for describing whether a collection is empty, i.e., its length is zero.

Checking whether a collection is empty should take a constant amount of time and space.

Required Methods

fn is_empty(&self) -> bool

Returns whether the collection is empty.

Implementors

• impl<T> Empty for [T]
• impl Empty for str
• impl Empty for CStr
• impl Empty for CString
• impl Empty for OsStr
• impl Empty for OsString
• impl<K: Eq + Hash, V> Empty for HashMap<K, V>
• impl<T: Eq + Hash> Empty for HashSet<T>
• impl<K: Ord, V> Empty for BTreeMap<K, V>
• impl<T: Ord> Empty for BTreeSet<T>
• impl<T: Ord> Empty for BinaryHeap<T>
• impl<T> Empty for LinkedList<T>
• impl Empty for String
• impl<T> Empty for Vec<T>
• impl<T> Empty for VecDeque<T>