Ada Programming/Libraries/Ada.Strings.Wide Wide Unbounded.Wide Wide Hash

is a unit of the Predefined Language Environment since Ada 2005.

Specification
AdaStringsWide_Wide_UnboundedWide_Wide_Hash Key  Unbounded_Wide_Wide_String AdaContainersHash_Type Preelaborate Wide_Wide_Hash

Wikibook

 * Ada Programming/Libraries/Ada