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  1. #include <set>
  2. #include <iostream>
  3.  
  4. struct KVP
  5. {
  6.     std::string key, value;
  7.  
  8.     KVP(const std::string& k, const std::string& v)
  9.         : key(k), value(v)
  10.     {
  11.     }
  12.  
  13.     bool operator<(const KVP& other) const
  14.     {
  15.         return value < other.value;
  16.     }
  17. };
  18.  
  19. int main()
  20. {
  21.     std::set<KVP> orderedpairs;
  22.     orderedpairs.insert(KVP("key1", "z"));
  23.     orderedpairs.insert(KVP("key2", "k"));
  24.     orderedpairs.insert(KVP("key3", "b"));
  25.  
  26.     for (std::set<KVP>::const_iterator it = orderedpairs.begin();
  27.          it != orderedpairs.end();
  28.          ++it)
  29.     {
  30.         std::cout << "k: '" << it->key <<   "'\n" <<
  31.                      "v: '" << it->value << "'\n";
  32.     }
  33. }
  34.  
Success #stdin #stdout 0s 2860KB
comments (?)
stdin
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Standard input is empty
stdout
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k: 'key3'
v: 'b'
k: 'key2'
v: 'k'
k: 'key1'
v: 'z'
https://ideone.com/SgbEN
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
secret

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