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  1. #include <iostream>
  2. #include <utility>
  3.  
  4. using namespace std;
  5.  
  6. template <typename T, typename Enable = typename std::conditional<!std::is_fundamental<T>::value,
  7. 		                             std::true_type,
  8. 		                             std::false_type>::type>
  9. struct strong_typedef;
  10.  
  11. //specialization for non fundamental types
  12. template <typename T>
  13. struct strong_typedef<T, std::true_type> : public T
  14. {
  15. 	template <typename... Args>
  16. 	strong_typedef(Args&&... args) : T(std::forward<Args>(args)...) {}
  17. };
  18.  
  19. //specialization for fundamental types
  20. template <typename T>
  21. struct strong_typedef<T, std::false_type>
  22. {                                                           
  23.     T t;                                                        
  24.     explicit strong_typedef(const T t_) : t(t_) {};          
  25.     strong_typedef(){};                                         
  26.     strong_typedef(const strong_typedef & t_) : t(t_.t){}                                 
  27.     strong_typedef & operator=(const strong_typedef & rhs) { t = rhs.t; return *this;}    
  28.     strong_typedef & operator=(const T & rhs) { t = rhs; return *this;}      
  29.     /*operator const T & () const {return t; }*/                
  30.     operator T & () { return t; }                               
  31.     bool operator==(const strong_typedef & rhs) const { return t == rhs.t; } 
  32.     bool operator<(const strong_typedef & rhs) const { return t < rhs.t; }   
  33. };	
  34.  
  35. struct A {int value;};
  36. using B = strong_typedef<A>;
  37.  
  38. int main() {
  39. 	B test;
  40. 	test.value = 4;
  41. 	std::cout << test.value << std::endl;
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 3096KB
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https://ideone.com/WAbhS1
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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