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C++ array and polymorphic objects

MARS_999 · 2012-04-19T19:11:00

I am wondering how could you code something like this with a C style array, without making it into a vector container? I am assuming it isn't possible? class Obj3D { public: std::string id; explicit Obj3D(const std::string& name) { id = name; } virtual ~Obj3D(){} virtual void Draw(void) = 0; }; class Mesh : public Obj3D { public: explicit Mesh(const std::string& name) : Obj3D(name){} virtual ~Mesh(){} virtual void Draw(void) { std::cout << id << std::endl; } }; class Cube : public Obj3D { public: explicit Cube(const std::string& name) : Obj3D(name){} virtual ~Cube(){} virtual void Draw(void) { std::cout << id << std::endl; } }; class Sphere : public Obj3D { public: explicit Sphere(const std::string& name) : Obj3D(name){} virtual ~Sphere(){} virtual void Draw(void) { std::cout << id << std::endl; } }; Now I want to make one array that holds all various derived objects.... //now place each object into array? I can't see how you can allocate these after you already allocated 1000 for Obj3D* pointers... Obj3D* p = new Obj3D[1000];[/font]// I am sure this isn't going to work.... for(int i = 0; i < 1000; ++i) p = new Mesh();//or cube, sphere... or worse yet add one at a time... So with a std::vector I can do this... std::vector<Obj3D*> objects; objects.push_back(new Mesh("BLAH")); objects.push_back(new Sphere("BLAH")); objects.push_back(new Cube("BLAH")); then run through the vector and walla... Thanks....

General and Gameplay Programming Programming

Started by MARS_999 April 18, 2012 10:46 PM

29 comments, last by ApochPiQ 11 years, 12 months ago

ApochPiQ

23,138

April 19, 2012 07:11 PM

Yeah, I think we've had enough of this one.

MARS_999, if you have more questions, please feel free to open a new thread. But this back-and-forth off-topic stuff can stop.

Wielder of the Sacred Wands
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C++ array and polymorphic objects

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