xplcidl/anytype.h

   1 #ifndef __ANYTYPE_H
   2 #define __ANYTYPE_H
   3
   4 #include <xplc/delete.h>
   5 #include <xplc/uuid.h>
   6 #include <xplc/uuidops.h>
   7 #include <xplc/ptr.h>
   8 #include "wvstring.h"
   9
  10 class AnyType
  11 {
  12 public:
  13     /// a pointer to any interface of this object
  14     void *raw;
  15
  16     /// the iid of the above interface
  17     UUID iid;
  18
  19     /// a pointer to this object's IObject interface, if any
  20     IObject *obj;
  21
  22     /// a string representing this item (only if all above objects are NULL)
  23     WvString str;
  24
  25     AnyType(void *_raw, const UUID &_iid, IObject *_obj = NULL)
  26         : iid(_iid), obj(_obj)
  27         { raw = _raw; if (_obj) _obj->addRef(); }
  28
  29     AnyType(WvStringParm _str)
  30         : iid(UUID_null), obj(0), str(_str)
  31         { raw = 0; }
  32
  33     AnyType()
  34         : iid(UUID_null), obj(0)
  35         { raw = 0; }
  36
  37     ~AnyType()
  38         { /* automatic via xplc_ptr */ }
  39
  40     bool switchto(const UUID &niid)
  41     {
  42         if (iid == niid) return true; // already done!
  43         if (iid == UUID_null) return true; // anybody can do that...
  44         if (!obj) return false;
  45
  46         IObject *n = obj->getInterface(niid);
  47         if (n)
  48         {
  49             obj->release();
  50             raw = obj = n;
  51             return true;
  52         }
  53         return false;
  54     }
  55
  56     template <typename T>
  57     T *get()
  58     {
  59         if (switchto(XPLC_IID<T>::get()))
  60             return (T *)raw;
  61         else
  62             return NULL;
  63     }
  64
  65     template <typename T>
  66     operator T* ()
  67         { return get<T>(); }
  68 };
  69
  70
  71 #endif // __ANYTYPE_H