Object method as callback

sed_lex 2023.01.06 12:50

Hello,

I'm trying to use an object method as a callback, inside an object method.

typedef int (*IntCallback)();

class Obj
{
    public:
    Obj()
    {

    }

    public:
    int func()
    {
        return 1;
    }

    public:
    void print_icb(IntCallback icb)
    {
        Print(icb());
    }

    public:
    void print()
    {
        // Both not compiling : 'func' - pointer to this function type is not supported yet
        print_icb(func);
        print_icb(Obj::func);        
    }
};

The only solution i found was to take out 'func' of the class scope, but i want to keep the benefit of ... well ... the class scope.

Is it possible to achieve what i'm trying to do ? Is my syntax wrong somewhere ? How would you procede otherwise ?

Thanks for your advices.

Amir Yacoby 2023.01.06 23:03 #1

You can't because it's not supported yet, but maybe you can come close with

interface IntCallback
  {
   int func();
  };
class Obj : public IntCallback
  {
public:
                     Obj()
     {

     }

public:
   int               func()
     {
      return 1;
     }

public:
   void              print_icb(IntCallback *icb)
     {
      Print(icb.func());
     }

public:
   void              print()
     {
      print_icb(&this);
     }
  };