Anonymous class

heatblazer

Hello, I know it`s kind of C++ question, but since Qt is entirely C++, I hope to find the answer here. This is my idea and my code:

AnonymousClass.h
@
class AnonymousClass {

public:
Callbacks* factories;
AnonymousClass(Callbacks* cb);
AnonymousClass();
virtual ~AnonymousClass()=0;
virtual void say()=0;
};
@

And somewhere in the program:
@
AnonymousClass* setAClass() {

struct ooof : AnonymousClass {
public:
   ooof(){
        std::cout << "I am magic...\n";
    }
    ~ooof() {
        std::cout << "I am dying...\n";
    }
    void say() {
        std::cout << " I am anonymous ooof(). Hello!\n";
    }
};

return (ooof*) new ooof;

}
@

So, when I compile, there are no errors. But I expect the couts() to be called, and the say() to be available in this fashion:
@
...
AnonymousClass* speaker = setAClass();
speaker->say(); //expected "I am anonymous ooof()"
@
However, it did not work. Please tell me where I got wrong. Also I can`t write back these days since my net sucks. I used a friendly PC to post here. Thanks in advance.

ondrejandrej

I tried to compile your code, but the compiler complains that it doesn't know "Callbacks".

andreyc

It works as expected on Linux g++ 4.8.3
I removed the references to Callbacks and added the implementations for ctor and dtor.

@
class AnonymousClass
{
public:
AnonymousClass()
{
std::cout << FUNCTION << "\n";
}

    virtual ~AnonymousClass()
    {
        std::cout << __FUNCTION__ << "\n";
    }

    virtual void say() = 0;

};

AnonymousClass* setAClass()
{
class ooof : public AnonymousClass
{
public:
ooof()
{
std::cout << "I am magic...\n";
}

        ~ooof()
        {
            std::cout << "I am dying...\n";
        }

        void say()
        {
            std::cout << " I am anonymous ooof(). Hello!\n";
        }
};

return (ooof*)new ooof;

}

int main()
{
AnonymousClass* speaker = setAClass();
speaker->say(); //expected "I am anonymous ooof()"
delete speaker;
return 0;
}
@

And output is
@
AnonymousClass
I am magic...
I am anonymous ooof(). Hello!
I am dying...
~AnonymousClass
@

What kind of problem do you have ?