include/AD/objc/class.h

   1 //////////////////////////////////////////////////////////////////////////////
   2 // NOTICE:
   3 //
   4 // ADLib, Prop and their related set of tools and documentation are in the
   5 // public domain.   The author(s) of this software reserve no copyrights on
   6 // the source code and any code generated using the tools.  You are encouraged
   7 // to use ADLib and Prop to develop software, in both academic and commercial
   8 // settings, and are welcomed to incorporate any part of ADLib and Prop into
   9 // your programs.
  10 //
  11 // Although you are under no obligation to do so, we strongly recommend that
  12 // you give away all software developed using our tools.
  13 //
  14 // We also ask that credit be given to us when ADLib and/or Prop are used in
  15 // your programs, and that this notice be preserved intact in all the source
  16 // code.
  17 //
  18 // This software is still under development and we welcome(read crave for)
  19 // any suggestions and help from the users.
  20 //
  21 // Allen Leung
  22 // 1994
  23 //////////////////////////////////////////////////////////////////////////////
  24
  25 #ifndef class_and_metaclass_base_classes_h
  26 #define class_and_metaclass_base_classes_h
  27
  28 #include <AD/objc/objc.h>        // object base class
  29
  30 //////////////////////////////////////////////////////////////////////////////
  31 //  Forward and opaque definitions
  32 //////////////////////////////////////////////////////////////////////////////
  33 class O_Class;          // class object base class
  34 class O_MetaClass;      // metaclass object base class
  35 class O_Protocol;       // protcol base class
  36 class O_SelectorCache;  // cache for a selector
  37 class O_MethodTable;    // method table
  38
  39 //////////////////////////////////////////////////////////////////////////////
  40 //  Definition of class O_Class
  41 //////////////////////////////////////////////////////////////////////////////
  42 class O_Class : public O_Object {
  43    O_Class(const O_Class&);           // no copy constructor
  44    void operator = (const O_Class&);  // no assignment
  45 protected:
  46    ///////////////////////////////////////////////////////////////////////////
  47    //  Description for a class
  48    ///////////////////////////////////////////////////////////////////////////
  49    O_Class *         super_class;     // super class in the hierarchy
  50    O_MethodTable *   method_table;    // table of selectors -> method
  51    O_SelectorCache * selector_cache;  // method cache
  52 public:
  53    ///////////////////////////////////////////////////////////////////////////
  54    //  Some imported types
  55    ///////////////////////////////////////////////////////////////////////////
  56    typedef O_Object            Super;
  57    typedef Super::ObjectMethod ObjectMethod;
  58    typedef Super::O_SEL        O_SEL;
  59
  60 public:
  61
  62    ///////////////////////////////////////////////////////////////////////////
  63    //  Constructor and destructor
  64    ///////////////////////////////////////////////////////////////////////////
  65             O_Class(O_Class * my_super_class, O_MetaClass * my_meta_class);
  66    virtual ~O_Class();
  67
  68    ///////////////////////////////////////////////////////////////////////////
  69    //  Attributes
  70    ///////////////////////////////////////////////////////////////////////////
  71    inline const O_Class * my_super() const { return super_class; }
  72    inline       O_Class * my_super()       { return super_class; }
  73
  74    ///////////////////////////////////////////////////////////////////////////
  75    //  Methods for manipulating the method table and cache
  76    ///////////////////////////////////////////////////////////////////////////
  77    virtual ObjectMethod lookup_method  (O_SEL);
  78    virtual void         add_method     (O_SEL, ObjectMethod);
  79    virtual void         delete_method  (O_SEL);
  80    virtual Bool         is_defined     (O_SEL) const;
  81    virtual Bool         can_understand (O_SEL);
  82 };
  83
  84 //////////////////////////////////////////////////////////////////////////////
  85 //  Definition of class MetaClass
  86 //////////////////////////////////////////////////////////////////////////////
  87 class O_MetaClass : public O_Class {
  88    O_MetaClass(const O_MetaClass&);       // no copy constructor
  89    void operator = (const O_MetaClass&);  // no assignment
  90 public:
  91    ///////////////////////////////////////////////////////////////////////////
  92    //  Some imported types
  93    ///////////////////////////////////////////////////////////////////////////
  94    typedef O_Class             Super;
  95    typedef Super::ObjectMethod ObjectMethod;
  96    typedef Super::O_SEL        O_SEL;
  97
  98 public:
  99
 100    ///////////////////////////////////////////////////////////////////////////
 101    //  Constructor and destructor
 102    ///////////////////////////////////////////////////////////////////////////
 103             O_MetaClass(O_Class * my_super_class, O_MetaClass * my_meta_class);
 104    virtual ~O_MetaClass();
 105 };
 106
 107 #endif