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  1. #include <string>
  2. #include <unordered_map>
  3. #include <chrono>
  4. #include <vector>
  5. #include <algorithm>
  6. #include <iostream>
  7.  
  8. struct Index {
  9. 	std::vector<std::string> collections;
  10. 	std::chrono::system_clock::time_point last_query_time;
  11. };
  12.  
  13. struct Database {
  14. 	std::vector<std::string> collection_names;
  15. 	std::vector<Index> indexes;
  16. };
  17.  
  18. using time_point = std::chrono::system_clock::time_point;
  19.  
  20. std::unordered_map<std::string, time_point> get_last_query_time(const Database& database) {
  21.  
  22. 	std::unordered_map<std::string, time_point> last_query;
  23.  
  24. 	for (auto& c : database.collection_names) {
  25. 		last_query[c] = {};
  26. 	}
  27. 	for (auto& i : database.indexes){
  28. 		for (auto& c : i.collections) {
  29. 			last_query[c] = std::max(last_query[c], i.last_query_time);
  30. 		}
  31. 	}
  32. 	return last_query;
  33. }
  34.  
  35. int main() {
  36. 	Database database{ {"collection1","collection2","collection3"}, {{{"collection1","collection3"},std::chrono::system_clock::now()}} };
  37.  
  38. 	auto last_query = get_last_query_time(database);
  39.  
  40. 	for (auto& p : last_query) {
  41. 		std::cout << p.first << ":" << p.second.time_since_epoch().count() << "\n";
  42. 	}
  43.  
  44.  
  45. }
Success #stdin #stdout 0s 3416KB
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stdin
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Standard input is empty
stdout
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collection3:1466478769651581748
collection2:0
collection1:1466478769651581748
https://ideone.com/cUQyRi
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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