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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4.  
  5. template <class T>
  6. class templateWithVector {
  7. public:
  8.     std::vector<T*>vec;
  9.  
  10.     T *getFromVector(unsigned int idx) {
  11.         if (idx < vec.size())
  12.             return vec.at(idx);
  13.         return nullptr;
  14.     }
  15. };
  16.  
  17. class classBase {
  18. protected:	
  19.   virtual ~classBase() {};
  20. };
  21. class bSpecifics{};
  22.  
  23. class B : public classBase, public templateWithVector<bSpecifics> {
  24. public:
  25.     B() {
  26.         for (int i = 0; i < 3; i++)
  27.             vec.push_back(new bSpecifics());
  28.     }
  29. };
  30.  
  31. class C: public templateWithVector<bSpecifics>
  32. {
  33. };
  34.  
  35. int main() {
  36. 	{
  37. 		classBase *myB = new B();
  38. 		templateWithVector<bSpecifics> *p = dynamic_cast<templateWithVector<bSpecifics>*>(myB);
  39. 		if (p != nullptr)
  40. 		    cout << "B:" << p->getFromVector(1) << endl;
  41. 	}
  42. 	{
  43. 		templateWithVector<bSpecifics> *myC = new C();
  44. 		templateWithVector<bSpecifics> *p = dynamic_cast<templateWithVector<bSpecifics>*>(myC);
  45. 		if (p != nullptr)
  46. 		    cout << "C:" << p->getFromVector(1) << endl;
  47. 	}
  48.  
  49. 	return 0;
  50. }
Success #stdin #stdout 0s 4396KB
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stdin
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Standard input is empty
stdout
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B:0x5557264f7c90
C:0
https://ideone.com/G7Ae6m
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
secret

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