In C++ a class is a user-defined type, syntactically a struct with member functions. Constructors and destructors are member functions called to create or destroy instances. A friend is a nonmember function that is allowed to access the private portion of a class. C++ allows implicit type conversion, function inlining, overloading of operators and function names, and default function arguments. It has streams for I/O and references.
C++ 2.0 (May 1989) introduced multiple inheritance, type-safe linkage, pointers to members, and abstract classes.
C++ 2.1 was introduced in ["Annotated C++ Reference Manual", B. Stroustrup et al, A-W 1990].
MS-DOS (ftp://grape.ecs.clarkson.edu/pub/msdos/djgpp/djgpp.zip), Unix ANSI C++ (ftp://gnu.org/pub/gnu/g++-1.39.0.tar.Z) - X3J16 committee. (They're workin' on it).
["The C++ Programming Language", Bjarne Stroustrup, A-W, 1986].