Assertion: set's element | /r/HasProperty | unique
Facets:
Source sentences:
text: Sets are containers that store unique elements following a specific order.
text: Every set element is unique (no duplicates) and must be immutable (cannot be changed).
text: Because elements in a set are unique, the insertion operation checks whether each inserted element is equivalent to an element already in the container, and if so, the element is not inserted, returning an iterator to this existing element (if the function returns a value).For a similar container allowing for duplicate elements, see multiset Internally, set containers keep all their elements sorted following the criterion specified by its comparison object .