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  1. #include <iostream>
  2. #include <type_traits>
  3.  
  4. namespace so
  5. {
  6. struct _base_ {};
  7.  
  8. struct _foo1_{};
  9. struct _foo2_{};
  10. struct _foo3_{};
  11.  
  12. class _derived_: public _base_
  13. {
  14.  public:
  15.   _derived_() = default;
  16.  
  17.   _derived_(_derived_ const & _obj)
  18.       : _base_(_obj)
  19.   {
  20.    std::cout << "Constructed from _derived_" << std::endl;
  21.   }
  22.  
  23.   _derived_(_base_ const & _obj)
  24.       : _base_(_obj)
  25.   {
  26.    std::cout << "Constructed from _base_" << std::endl;
  27.   }
  28.  
  29.   template <typename _t_, typename = typename std::enable_if<
  30.      std::is_same<_t_, _foo1_>::value || std::is_same<_t_, _foo2_>::value || 
  31.      std::is_same<_t_, _foo3_>::value>::type>
  32.   _derived_(_t_ const &)
  33.       : _base_()
  34.   {
  35.    std::cout << "Constructed from _fooN_ using generic algorithm" << std::endl;
  36.   }
  37.  
  38.   ~_derived_() noexcept (true) = default;
  39. };
  40. } //namespace so
  41.  
  42.  
  43. int main()
  44. {
  45.  so::_base_ b_{};
  46.  so::_derived_ d_{};
  47.  so::_foo1_ f1_{};
  48.  so::_foo2_ f2_{};
  49.  so::_foo3_ f3_{};
  50.  
  51.  so::_derived_ db_{b_};
  52.  so::_derived_ dd_{d_};
  53.  so::_derived_ df1_{f1_};
  54.  so::_derived_ df2_{f2_};
  55.  so::_derived_ df3_{f3_};
  56.  
  57.  return (0);
  58. }
Success #stdin #stdout 0s 3296KB
comments (?)
stdin 
Standard input is empty
stdout 
Constructed from _base_
Constructed from _derived_
Constructed from _fooN_ using generic algorithm
Constructed from _fooN_ using generic algorithm
Constructed from _fooN_ using generic algorithm
https://ideone.com/uXHFS4
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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