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  1. #include <cstdio>
  2.  
  3. template <typename T>
  4. struct unnamed_lambda
  5. {
  6.     unnamed_lambda(T term) : captured_term(term) {}
  7.  
  8.     template <typename A>
  9.     unnamed_lambda operator()(A func);
  10.  
  11.     T captured_term;
  12. };
  13.  
  14. struct terminal_lambda
  15. {
  16.     template <typename A>
  17.     unnamed_lambda<A> operator()(A term)
  18.     {
  19.         return unnamed_lambda<A>{term};
  20.     }
  21. };
  22.  
  23. terminal_lambda terminal;
  24.  
  25. template <typename T>
  26. template <typename A>
  27. unnamed_lambda<T> unnamed_lambda<T>::operator()(A func)
  28. {
  29.     return terminal(func(captured_term));
  30. }
  31.  
  32. struct Hello
  33. {
  34.     FILE* operator()(FILE* s)
  35.     {
  36.         fprintf(s, "Hello\n");
  37.         return s;
  38.     }
  39. };
  40.  
  41. struct World
  42. {
  43.     FILE* operator()(FILE* s)
  44.     {
  45.         fprintf(s, "World\n");
  46.         return s;
  47.     }
  48. };
  49.  
  50. int main()
  51. {    
  52. 	Hello hello;
  53. 	World world;
  54.     unnamed_lambda<FILE*> l1 = terminal(stdout);
  55.     unnamed_lambda<FILE*> l2 = l1(hello);
  56.     unnamed_lambda<FILE*> l3 = l2(world);
  57.  
  58.     // same as:
  59.     terminal(stdout)(hello)(world);
  60. }
  61.  
Success #stdin #stdout 0s 3344KB
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stdin
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Standard input is empty
stdout
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Hello
World
Hello
World
https://ideone.com/vyJSIO
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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