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  1. #include <iostream>
  2. #include <string>
  3. #include <vector>
  4.  
  5. struct Feature {
  6.   float x;
  7.   float y;
  8.   float value;
  9. };
  10.  
  11. class BaseClass {
  12.   public:
  13.     int GetDetections(const std::string& filename) const {
  14.         // Normally, I'd read in features from a file, but for this online
  15.         // example, I'll just construct an feature set manually.
  16.         std::vector<Feature> features;
  17.         return GetDetections(features);
  18.     };
  19.     // Pure virtual function.
  20.     virtual int GetDetections(const std::vector<Feature>& features) const = 0;
  21. };
  22.  
  23. class SubClass : public BaseClass {
  24.   public:
  25.     // Giving the pure virtual function an implementation in this class.
  26.     using BaseClass::GetDetections;
  27.     int GetDetections(const std::vector<Feature>& features) const {
  28.         return 7;
  29.     }
  30. };
  31.  
  32. int main() {
  33.     SubClass s;
  34.     std::cout << s.GetDetections("testfile.txt");
  35. }
Success #stdin #stdout 0s 3028KB
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7
https://ideone.com/rEW7Dt
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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