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  1. #include <iostream>
  2.  
  3. enum types { INTEGER, DOUBLE, BOOL, STRING };
  4.  
  5. class Descriptor {
  6.  
  7. public:
  8.     Descriptor(types type):
  9.         _type{type}
  10.     {}
  11.     types &type() { return _type; }
  12.  
  13.  
  14.     virtual ~Descriptor() = default;
  15.  
  16. private:
  17.     types _type;
  18. };
  19.  
  20. class Number: public Descriptor {
  21.  
  22. public:
  23.     Number(types descType):
  24.         Descriptor(descType)
  25.     {}
  26.  
  27.     virtual ~Number() = default;
  28.  
  29.     int intValue;
  30. };
  31.  
  32.  
  33. void printValue(Descriptor &t) {
  34.  
  35.   auto cast = dynamic_cast<Number *>(&t);
  36.   if (cast == nullptr) {
  37.     std::cout << "Err" << std::endl;
  38.   } else {
  39.     std::cout << "Works" << std::endl;
  40.   }
  41. }
  42.  
  43.  
  44. int main() {
  45.  
  46.   Number t =  Number(INTEGER);
  47.   t.intValue = 1;
  48.  
  49.   printValue(t);
  50. }
  51.  
Success #stdin #stdout 0s 15240KB
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Standard input is empty
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Works
https://ideone.com/GCufdv
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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