Decorator - c++

Decorator

C++有些要注意的地方
像是呼叫super class的constructor要在brace前用: Base()
以及呼叫super class的method要用"::"運算子: Base::Method()

#include 
using namespace std;

class IComp {
public:
    virtual void doSomething() = 0;
};

class fromComp : public IComp {
public:
    virtual void doSomething() {
        cout << "non Deco" << endl;
    }
};

class Deco : public IComp {
public:
    Deco(IComp* i) : theOrin(i) {}
    virtual void doSomething() {
        theOrin->doSomething();
    }
    virtual ~Deco(){
        delete(theOrin);
    }
private:
    IComp* theOrin;
};

class DecoA : public Deco {
public:
    DecoA(IComp* i) : Deco(i) {}
    virtual void doSomething() {
        cout << "DecoA" << endl;
        Deco::doSomething();
    }
};

class DecoB : public Deco {
public:
    DecoB(IComp* i) : Deco(i) {}
    virtual void doSomething() {
        cout << "DecoB" << endl;
        Deco::doSomething();
    }
};


int main()
{
    fromComp* a = new fromComp();
    a->doSomething();
    DecoA* b = new DecoA(a);
    b->doSomething();
    DecoB* c = new DecoB(a);
    c->doSomething();
    return 0;
}