资料来源 : Free On-Line Dictionary of Computing

Objective C
     
         An {object-oriented} superset of {ANSI C} by Brad
        Cox, Productivity Products.  Its additions to {C} are few and
        are mostly based on {Smalltalk}.  Objective C is implemented
        as a {preprocessor} for {C}.  Its {syntax} is a superset of
        standard C syntax, and its {compiler} accepts both C and
        Objective C {source code} ({filename extension} ".m").
     
        It has no operator {overloading}, {multiple inheritance}, or
        {class variables}.  It does have {dynamic binding}.  It is
        used as the system programming language on the {NeXT}.  As
        implemented for {NEXTSTEP}, the Objective C language is fully
        compatible with {ANSI C}.
     
        Objective C can also be used as an extension to {C++}, which
        lacks some of the possibilities for {object-oriented design}
        that {dynamic typing} and {dynamic binding} bring to Objective
        C.  C++ also has features not found in Objective C.
     
        Versions exist for {MS-DOS}, {Macintosh}, {VAX}/{VMS} and
        {Unix} {workstation}s.  Language versions by {Stepstone},
        {NeXT} and {GNU} are slightly different.
     
        There is a library of ({GNU}) Objective C {objects} by
        R. Andrew McCallum  with similar
        functionality to {Smalltalk}'s Collection objects.  It
        includes: Set, {Bag}, {Array}, LinkedList, LinkList,
        CircularArray, {Queue}, {Stack}, {Heap}, SortedArray,
        MappedCollector, GapArray and DelegateList.  Version: Alpha
        Release.  {(ftp://iesd.auc.dk/pub/ObjC/)}.
     
        See also: {Objectionable-C}.
     
        ["Object-Oriented Programming: An Evolutionary Approach", Brad
        Cox, A-W 1986].
     
        (1999-07-10)