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  1. #include <iostream>
  2. #include <unordered_map>
  3. #include <string>
  4. using namespace std;
  5.  
  6. int main() {
  7. 	// your code goes here
  8. 	std::unordered_map<int, string> m;
  9. 	m[1]="aa";
  10. 	m[2]="bb";
  11. 	m[3]="cc";
  12. 	//std::lock_guard<std::mutex> lock(m_mutex);
  13.     for (auto& pos: m) {
  14.         auto key = pos.first;
  15.         //auto val = pos.second;
  16.         pos.second = "new val";
  17.         //cout<<key<<" "<<val<<endl;
  18.     }
  19.     for (auto& pos: m) {
  20.         auto key = pos.first;
  21.         auto val = pos.second;
  22.         cout<<key<<" "<<val<<endl;
  23.     }
  24. 	return 0;
  25. }
Success #stdin #stdout 0.01s 5392KB
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stdin
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Standard input is empty
stdout
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3 new val
1 new val
2 new val
https://ideone.com/Cj3WPy
language:
C++14 (gcc 8.3)
created:
326 days ago
visibility:
public

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