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  1. #include <iostream>
  2. #include <set>
  3. #include <string>
  4.  
  5. typedef  std::set<std::pair<std::string, std::string> > ssset;
  6.  
  7. ssset::iterator get_key(ssset& s, std::string key)
  8. {
  9.   ssset::iterator it = s.lower_bound(std::make_pair(key, ""));
  10.   if (it != s.end() && it->first == key) return it;
  11.   return s.end();   
  12. }
  13.  
  14. ssset::const_iterator get_key(const ssset& s, std::string key)
  15. {
  16.   ssset::const_iterator it = s.lower_bound(std::make_pair(key, ""));
  17.   if (it != s.end() && it->first == key) return it;
  18.   return s.end();   
  19. }
  20.  
  21. void insert(ssset& s, std::string key, std::string value)
  22. {
  23.    s.insert(std::make_pair(key, value));
  24. }
  25.  
  26. int main() {
  27.    ssset s;
  28.    insert(s, "abc", "def");
  29.    insert(s, "def", "def");
  30.    insert(s, "abc", "ghi");
  31.    insert(s, "abc", "ghi");
  32.    insert(s, "abc", "abc");
  33.  
  34.    std::cout << "abc" << std::endl;
  35.    for (ssset::iterator it = get_key(s, "abc"); it != s.end() && it->first == "abc"; ++it)
  36.      std::cout << it->first << "->" << it->second << std::endl;
  37.  
  38.    std::cout << "def" << std::endl;
  39.    for (ssset::iterator it = get_key(s, "def"); it != s.end() && it->first == "def"; ++it)
  40.      std::cout << it->first << "->" << it->second << std::endl;
  41.  
  42.    std::cout << "ghi" << std::endl;
  43.    for (ssset::iterator it = get_key(s, "ghi"); it != s.end() && it->first == "ghi"; ++it)
  44.      std::cout << it->first << "->" << it->second << std::endl;
  45.  
  46.    std::cout << "----- ALL ----" << std::endl;
  47.    for (ssset::iterator it = s.begin(); it != s.end(); ++it)
  48.      std::cout << it->first << "->" << it->second << std::endl;
  49.  
  50. }
Success #stdin #stdout 0.01s 2820KB
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stdin
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Standard input is empty
stdout
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abc
abc->abc
abc->def
abc->ghi
def
def->def
ghi
----- ALL ----
abc->abc
abc->def
abc->ghi
def->def
https://ideone.com/tTFEX
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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