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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. struct PrintHello
  5. {
  6.     void operator () ()
  7.     {
  8.         std::cout << "Hello";
  9.     }
  10. };
  11.  
  12. struct PrintWorld
  13. {
  14.     void operator () ()
  15.     {
  16.         std::cout << "World";
  17.     }
  18. };
  19.  
  20. template<typename Func>
  21. class FooBar
  22. {
  23. public:
  24.     FooBar() 
  25.     {
  26.     }
  27.  
  28.     FooBar(Func _func) : func(_func) 
  29.     {
  30.     }
  31.  
  32.     void print()
  33.     {
  34.         func();
  35.     }
  36.  
  37. private:
  38.     Func func;
  39. };
  40.  
  41. void freeFunction()
  42. {
  43.     std::cout << "I'm free";
  44. }
  45.  
  46. int main()
  47. {
  48.     FooBar<PrintHello> hello;
  49.     FooBar<PrintWorld> world;
  50.     FooBar<std::function<void()>> free_func(freeFunction);
  51.     hello.print();
  52.     std::cout << std::endl;
  53.     world.print();
  54.     std::cout << std::endl;
  55.     free_func.print();
  56.     std::cout << std::endl;
  57.     return 0;
  58. }
  59.  
Success #stdin #stdout 0s 3340KB
comments (?)
stdin 
Standard input is empty
stdout 
Hello
World
I'm free
https://ideone.com/Pn1xQ2
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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