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  1. #include <iostream>
  2. #include <complex>
  3.  
  4. template <typename T>
  5. class Vector
  6. {
  7.   public:
  8.     bool is_complex() { return false; }
  9. };
  10.  
  11. template <typename U>
  12. class ComplexVector : Vector<std::complex<U>>
  13. {
  14.   public:
  15.     bool is_complex() { return true; }
  16.     bool only_for_complex() { return true; }
  17. };
  18.  
  19. int main() {
  20.   Vector<float> float_vec;
  21.   ComplexVector<float> complex_vec;
  22.  
  23.   std::cout << "Is float_vec complex? " << float_vec.is_complex() << "\n";
  24.   std::cout << "Is complex_vec complex? " << complex_vec.is_complex() << "\n";
  25.  
  26.   // The following line doesn't compile
  27.   // std::cout << "Is only_for_complex method in float_vec? " << float_vec.only_for_complex() << "\n";
  28.   std::cout << "Is only_for_complex method in complex_vec? " << complex_vec.only_for_complex() << "\n";
  29.  
  30.   return 0;
  31. }
Success #stdin #stdout 0s 15232KB
comments (?)
stdin
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Standard input is empty
stdout
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Is float_vec complex? 0
Is complex_vec complex? 1
Is only_for_complex method in complex_vec? 1
https://ideone.com/ipkfDh
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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