fork download
copy 
  1. #include <string>
  2. #include <iostream>
  3. #include <vector>
  4. #include <map>
  5. #include <iterator>
  6.  
  7. typedef std::vector< std::pair<int, std::string>> Categories;
  8.  
  9. int main()
  10. {
  11.    std::map<std::string, Categories> cats;
  12.  
  13.    cats["key1"] = {std::make_pair(1, "pair1"), std::make_pair(1, "pair2"), std::make_pair(1, "par3")};
  14.    cats["key2"] = {std::make_pair(2, "pair1"), std::make_pair(2, "pair2")};
  15.    cats["key3"] = {std::make_pair(3, "pair1")};
  16.  
  17.    std::cout << "Range based loop \n";
  18.    for(const auto& it: cats)
  19.    {
  20.       std::cout << it.first << " = ";  // keys
  21.       for(const auto& ve: it.second)   // values vec
  22.          std::cout << ve.first << "-" << ve.second << "\t";
  23.       std::cout << std::endl;
  24.    }
  25.  
  26.    std::cout << "\nIterator loop \n";
  27.    std::map<std::string, Categories>::const_iterator it;
  28.    std::vector< std::pair<int, std::string>>::const_iterator curr_val_it;
  29.    for(it = cats.cbegin(); it != cats.cend(); ++it)
  30.    {
  31.       std::cout << it->first << " = "; // keys
  32.  
  33.       for(curr_val_it = it->second.cbegin(); curr_val_it != it->second.cend(); ++curr_val_it )
  34.           std::cout << curr_val_it->first << "-" << curr_val_it->second << "\t";  // values vec
  35.  
  36.       std::cout << std::endl;
  37.    }
  38.  
  39.  
  40.    return 0;
  41. }
  42.  
Success #stdin #stdout 0.01s 5300KB
comments ()
stdin
copy 
Standard input is empty
stdout
copy 
Range based loop 
key1 = 1-pair1	1-pair2	1-par3	
key2 = 2-pair1	2-pair2	
key3 = 3-pair1	

Iterator loop 
key1 = 1-pair1	1-pair2	1-par3	
key2 = 2-pair1	2-pair2	
key3 = 3-pair1
https://ideone.com/7MHRSp
language:
C++14 (gcc 8.3)
created:
5 days ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!