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  1. #include <iostream>
  2. #include <chrono>
  3. #include <ratio>
  4. #include <vector>
  5. #include <numeric>
  6. #include <algorithm>
  7.  
  8. template <class Rep, class Period = std::ratio<1> >
  9. using tmp_t = std::chrono::duration<Rep, Period>;
  10.  
  11. typedef tmp_t<int64_t> dollar_t;
  12. typedef tmp_t<int64_t, std::ratio<1,100>> cent_t;
  13.  
  14. //typedef tmp_t<int64_t, std::ratio<1,100>> store_money_t;
  15. struct store_money_t : cent_t { 
  16. 	store_money_t(cent_t::rep v = 0, bool null = false) : cent_t(v), is_null(null) {} 
  17. 	store_money_t(cent_t c) : cent_t(c) {} 
  18. 	store_money_t(dollar_t d) : cent_t(d) {} 
  19. 	bool is_null = false;
  20. };
  21.  
  22. dollar_t dollar_lost_cents_cast(cent_t cents) { return std::chrono::duration_cast<dollar_t>(cents); }
  23. std::ostream& operator<<(std::ostream& os, store_money_t store_money) { 
  24. 	os << store_money.count()/100 << "." << store_money.count()%100; 
  25. 	return os; 
  26. }
  27.  
  28. store_money_t null_money(0, true);
  29. bool not_null_money(store_money_t &m) { return !m.is_null; }
  30.  
  31. int main() {
  32.  
  33. 	// example
  34. 	store_money_t store_money = dollar_t(2) + cent_t(20);
  35. 	store_money += dollar_t(7);
  36. 	store_money += cent_t(18);
  37.  
  38. 	cent_t cents = store_money;
  39. 	dollar_t dollars = dollar_lost_cents_cast(cents);
  40.  
  41. 	std::cout << "dollar_lost_cents_cast = " << dollar_lost_cents_cast(store_money).count() << 
  42. 		", store_money = " << store_money << std::endl;
  43.  
  44. 	// INSERT INTO Table ( Column1 ) VALUES ( 0), ( null ), ( 6 )
  45. 	// SELECT AVG( Column1 ) FROM Table
  46. 	std::vector<store_money_t> user_accounts = { cent_t(0), null_money, dollar_t(6) };
  47.  
  48. 	store_money_t sum = std::accumulate (user_accounts.begin(), user_accounts.end(), store_money_t());
  49. 	std::cout << "sum = " << sum << std::endl;
  50.  
  51. 	store_money_t::rep count = std::count_if(user_accounts.begin(), user_accounts.end(), not_null_money);
  52. 	std::cout << "count = " << count << std::endl;
  53.  
  54. 	store_money_t avg = sum / count;
  55. 	std::cout << "avg = " << avg << std::endl;
  56.  
  57. 	// SELECT 0 + null + 6 FROM dual
  58. 	store_money_t sum_select_statment = cent_t(0) + null_money + dollar_t(6);
  59. 	std::cout << "sum_select_statment = " << sum_select_statment << std::endl;
  60.  
  61. 	return 0;
  62. }
Success #stdin #stdout 0s 3460KB
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Standard input is empty
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dollar_lost_cents_cast = 9, store_money = 9.38
sum = 6.0
count = 2
avg = 3.0
sum_select_statment = 6.0
https://ideone.com/Dr2INK
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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