Ada 95
Ada 95
(language)Additions include object-orientation (tagged types,abstract types and class-wide types), hierarchicallibraries and synchronisation with shared data (protectedtypes) similar to Orca. It lacks multiple inheritance butsupports the construction of multiple inheritance typehierarchies through the use of generics and type composition.
GNAT aims to be a free implementation of Ada 95.
You can get the standard from the Ada Joint Program Office.
["Introducing Ada 9X", J.G.P. Barnes, Feb 1993].