Hash set with in-place open-addressing, storing keys (elements) of type K.
Is true iff T has a specific value dedicated to representing holes (removed/erase) values.
Remove all elements in x matching pred.
Range over elements of l-value instance of this.
Hash table/map with in-place open-addressing, storing keys of type K and values of type V.
Default key equality/equivalence predicate for the type T.
Is true iff T is a memory address (either a class or a pointer).