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  1. #include <iostream>
  2. #include <functional>
  3.  
  4. using namespace std;
  5.  
  6. class Notify
  7. {
  8. 	using HandlerType = std::function<void ( Notify& )>;
  9.  
  10. 	unsigned int Value_;
  11. 	HandlerType  Handler_;
  12.  
  13. public:
  14. 	Notify() : Value_( 0 )
  15. 	{
  16. 	}
  17.  
  18. 	unsigned int value() const
  19. 	{
  20. 		return Value_;
  21. 	}
  22.  
  23. 	void set_value( unsigned int Val )
  24. 	{
  25. 		if( Val != value() )
  26. 		{
  27. 			Value_ = Val;
  28. 			if( Handler_ )
  29. 			{
  30. 				Handler_( *this );
  31. 			}
  32. 		}
  33. 	}
  34.  
  35. 	void set_handler( HandlerType Handler )
  36. 	{
  37. 		Handler_ = Handler;
  38. 	}
  39. };
  40.  
  41. Notify n;
  42.  
  43. class Sink
  44. {
  45. public:
  46.    Sink()
  47.    {
  48.       n.set_handler( std::bind( &Sink::handler, this, std::placeholders::_1 ) );
  49.    }
  50.  
  51.    void handler( Notify& obj )
  52.    {
  53.       std::cout << "Handler called" << endl;
  54.    }
  55. };
  56.  
  57. int main()
  58. {
  59.    Sink s;
  60.    n.set_value( 123 );
  61.    return 0;
  62. }
  63.  
Success #stdin #stdout 0s 15240KB
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Standard input is empty
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Handler called
https://ideone.com/8rKfbx
language:
C++14 (clang 8.0)
created:
6 years ago
visibility:
public

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