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  1.     #include <map>
  2.     #include <vector>
  3.     #include <iostream>
  4.  
  5.     using namespace std;
  6.  
  7.     int main()
  8.     {
  9.         vector<int> keys = {0, 1};
  10.  
  11.         map<int, int> m;
  12.         m[1] = 5;
  13.         m[2] = 12;
  14.  
  15.         for (const int i : keys)
  16.         {
  17.             m[i]; // touch value
  18.         }
  19.  
  20.         for (auto const & kv : m)
  21.         {
  22.             cout << kv.first << ", " << kv.second << endl;
  23.         }
  24.     }
  25.  
Success #stdin #stdout 0s 3416KB
comments (?)
stdin
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Standard input is empty
stdout
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0, 0
1, 5
2, 12
https://ideone.com/jZJboQ
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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