Anyway, if I have somewhere in my code:
CFish *fish = &some_object; /* some_class is a pointer to either a CHerring or a CBillSmith */
Is there some way I can tell from that fish pointer whether it is in fact a CHerring or a CBillSmith? Or am I going to have to just have a variable within CFish that will keep track of what class it actually is? Just don''t want to waste variables unless necessary, ''cause I''m funny like that. Thanks a bunch!
-Arek the Absolute
class CFish{ virtual const string getIDname() const { return "Standard Fish"; } // or =0; if you prefer CFish to be an ADT};class CBillSmith : public CFish{ virtual const string getIDname() const { return "BillSmith"; }}; void foo (){ CFish* p_fish = //get your fish swim(p_fish);}void swim (CFish* p_fish){ switch (getTheTypeOfFish(objectType)) { case TYPE_HERRING: doFishSwim(p_fish); break; case TYPE_BILL_SMITH: doBackstroke(p_fish); break; }} class CFish{ public: virtual void swim () { doFishSwim(this); }};class CHerring : public CFish{ // inherits CFish::swim};class CBillSmith: public CFish{ // overrides Fish::swim() for custom behavior public: virtual void swim () { doBackstroke(this); }};// Use the virtual functionvoid foo (){ CFish* p_fish = //get your fish p_fish->swim();} quote: Original post by Gee
It''s just a non-variable-needed For Beginners solution...
But I can''t see why it wouldn''t always work? I''ve used this method, it worked fine... I can''t think of a as neat solution if it requires dynamic_cast to be used...
But do tell why my solution wouldn''t always work... Maybe it doesn''t, never questioned it before...
/G
class base{ virtual void print(void){cout << "base";}};class x : base{ virtual void print(void){cout << "x";}};class y : base{ virtual void print(void){cout << "y";}};int main(){ base arr[2]; x ax; y ay; arr[0] = ax; arr[1] = ay; for (int i = 0; i < 2;i++) arr[i].print(); return 0;}// OUTbasebase quote: Original post by Jonusarr[0] = ax; arr[1] = ay;
class base{ virtual void print(void){cout << "base";}};class x : base{ virtual void print(void){cout << "x";}};class y : base{ virtual void print(void){cout << "y";}};int main(){ base * arr[2]; x ax; y ay; arr[0] = &ax arr[1] = &ay for (int i = 0; i < 2;i++) arr[i]->print(); return 0;}// OUTxy quote: Original post by Jonus
The fun starts here, because with pointers it works well:
