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  1. #include <iostream>
  2.  
  3.     template<class T>struct identity{using type=T;};
  4.  
  5.     template <typename T, template<class>class Z=identity>
  6.     struct Yin {
  7.       template<class U>using Z_t=typename Z<U>::type;
  8.       Z_t<T> *m_ptr;
  9.     };
  10.  
  11.     template <typename T, template<class>class Z=identity>
  12.     struct Yang {
  13.       template<class U>using Z_t=typename Z<U>::type;
  14.       Z_t<T> *m_ptr;
  15.     };
  16.  
  17.     template<
  18.       template<class, template<class>class>class Yin,
  19.       template<class, template<class>class>class Yang
  20.     >
  21.     struct flopper {
  22.       template<class T> struct flip {
  23.         using type = Yang<T, flopper<Yang, Yin>::template flip>;
  24.       };
  25.     };
  26.  
  27.     using ying = Yin< void, flopper<Yin, Yang>::template flip >;
  28.     using yang = Yang< void, flopper<Yang, Yin>::template flip >;
  29.  
  30.  
  31. int main() {
  32. 	ying a = {nullptr};
  33. 	yang b = {&a};
  34.  
  35. 	// your code goes here
  36. 	return 0;
  37. }
Success #stdin #stdout 0s 3336KB
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https://ideone.com/QqgUjr
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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