#include #include #include #include #define print(obj) std::cout<__str__()<__getattr__(key) #define setattr(obj, key, value) obj->__setattr__(key, value) //class object class object { public: object() ; virtual ~object() ; virtual std::string __str__() const ; virtual object *__getattr__(std::string) const ; virtual void __setattr__(std::string, object*) const ; protected: std::map *__dict__ ; } ; //class Int class Int: public object { public: Int() ; Int(int) ; virtual ~Int() ; virtual std::string __str__() const ; protected: private: int real ; } ; class Float: public object { public: Float() ; Float(float) ; virtual ~Float() ; virtual std::string __str__() const ; private: float number ; } ; //example : class car class Car: public object { public: Car() ; virtual ~Car() ; virtual std::string __str__() const ; private: } ; /* DEFINITION OBJECT */ object::object() { this->__dict__ = new std::map ; } std::string object::__str__() const { } object::~object() { } object *object::__getattr__(std::string key) const { return (*(this->__dict__))[key] ; } void object::__setattr__(std::string key, object *obj) const { (*(this->__dict__))[key] = obj ; } /* DEFINITION INT */ Int::Int() { this->real = 0 ; } Int::Int(int value) { this->real = value ; } Int::~Int() { } std::string Int::__str__() const { return "int : " + std::to_string(this->real) ; } /* DEFINITION FLOAT */ Float::Float() { this->number = 0 ; } Float::Float(float value) { this->number = value ; } Float::~Float() { } std::string Float::__str__() const { std::ostringstream ss ; ss << this->number ; std::string s(ss.str()) ; return "float : " + s ; } /* DEFINITION CAR */ Car::Car() { this->__setattr__("wheels", new Int(4)) ; } Car::~Car() { } std::string Car::__str__() const { return "nb wheels : " + this->__getattr__("wheels")->__str__() ; } /* MAIN */ int main() { //a = an integer var a = new Int(5) ; //print = std::cout<__str__() print(a) ; //set new attributes to object a (integer of value 10) setattr(a, "integer", new Int(10)) ; //get attributes 'integer' of object a print(getattr(a, "integer")) ; //a is now a float a = new Float(2.5) ; print(a) ; //a is now a Car object a = new Car() ; print(a) ; print(getattr(a, "wheels")) ; //we can create arrays of different types var b[] = {new Int(10), new Car(), new Float(5.9)} ; //outputs 10 print(b[0]) ; //change number of wheels of object car setattr(b[1], "wheels", new Int(8)) ; print(b[1]) ; //outputs 5.9 print(b[2]) ; return 0 ; }

python in c++