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  1. #include <iostream>
  2. #include <ostream>
  3.  
  4. template<int Size>
  5. struct CrapParam
  6. {
  7. 	bool is_relevant()
  8. 	{
  9. 		return Size%2 == 0;
  10. 	}
  11. 	unsigned calc_size()
  12. 	{
  13. 		return Size;
  14. 	}
  15. 	void drop()
  16. 	{
  17. 		std::cout << "Dropped item with size="<< calc_size() << std::endl;
  18. 	}
  19. };
  20.  
  21. struct Dropper
  22. {
  23. 	template<class Item>
  24. 	void operator&(Item &item)
  25. 	{
  26. 		std::cout << "\t";
  27. 		item.drop();
  28. 	}
  29. };
  30.  
  31. struct Updater
  32. {
  33. 	unsigned size;
  34. 	Updater(): size(0) {}
  35. 	template<class Item>
  36. 	void operator&(Item &item)
  37. 	{
  38. 		std::cout << "\t";
  39. 		if(item.is_relevant())
  40. 		{
  41. 			std::cout << "Relevant item";
  42. 			size+=item.calc_size();
  43. 		}
  44. 		else
  45. 		{
  46. 			std::cout << "Irrelevant item";
  47. 		}
  48. 		std::cout << " with size=" << item.calc_size() << std::endl;
  49. 	}
  50. };
  51.  
  52. struct ParamAggregator
  53. {
  54. 	unsigned counter;
  55. 	ParamAggregator(): counter(0) {}
  56.  
  57. 	CrapParam<1> p1;
  58. 	CrapParam<2> someShit2;
  59. 	CrapParam<5> superCrap3;
  60. 	CrapParam<4> crappyShit4;
  61.  
  62. 	template<class Archive>
  63. 	void serialize(Archive & ar)
  64. 	{
  65. 		ar & p1;
  66. 		ar & someShit2;
  67. 		ar & superCrap3;
  68. 		ar & crappyShit4;
  69. 	}
  70.  
  71. 	int update()
  72. 	{
  73. 		++counter;
  74. 		std::cout << "Updating, counter=" << counter << std::endl;
  75. 		Updater updater;
  76. 		serialize(updater);
  77. 		std::cout << "Updated, size=" << updater.size << std::endl << std::endl;
  78. 		return updater.size;
  79. 	}
  80.  
  81. 	void drop()
  82. 	{
  83. 		std::cout << "Dropping items" << std::endl;
  84. 		Dropper d;
  85. 		serialize(d);
  86. 		std::cout << "Items are droped" << std::endl << std::endl;
  87. 	}
  88. };
  89.  
  90.  
  91.  
  92. int main(int argc,char *argv[])
  93. {
  94. 	ParamAggregator pa;
  95. 	pa.update();
  96. 	pa.drop();
  97. 	pa.update();
  98. 	return 0;
  99. }
  100.  
Success #stdin #stdout 0.01s 2684KB
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stdin
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Standard input is empty
stdout
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Updating, counter=1
	Irrelevant item with size=1
	Relevant item with size=2
	Irrelevant item with size=5
	Relevant item with size=4
Updated, size=6

Dropping items
	Dropped item with size=1
	Dropped item with size=2
	Dropped item with size=5
	Dropped item with size=4
Items are droped

Updating, counter=2
	Irrelevant item with size=1
	Relevant item with size=2
	Irrelevant item with size=5
	Relevant item with size=4
Updated, size=6
https://ideone.com/NWmgk
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
secret

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