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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <vector>
  4. #include <string>
  5.  
  6. struct my_struct
  7. {
  8.     std::string first_name;
  9.     std::string last_name;
  10. };
  11.  
  12. struct CompareFirstName
  13. {
  14.     explicit CompareFirstName(const std::string& s) : first_name(s) {}
  15.  
  16.     bool operator () (const my_struct& person) const
  17.     {
  18.         return person.first_name == first_name;
  19.     }
  20.  
  21.     std::string first_name;
  22. };
  23.  
  24. int main()
  25. {
  26.   std::vector<my_struct> my_vector(5);
  27.  
  28.   my_vector[0].first_name = "David";
  29.   my_vector[0].last_name = "Andriw";
  30.  
  31.   my_vector[1].first_name = "Jhon";
  32.   my_vector[1].last_name = "Monta";
  33.  
  34.   my_vector[2].first_name = "Jams";
  35.   my_vector[2].last_name = "Ruth";
  36.  
  37.   my_vector[3].first_name = "David";
  38.   my_vector[3].last_name = "AAA";
  39.  
  40.   my_vector[4].first_name = "Jhon";
  41.   my_vector[4].last_name = "BBB";
  42.  
  43.   for(int i = 0; i < my_vector.size(); i++)
  44.   {
  45. 		int my_count = std::count_if(my_vector.begin(), my_vector.end(),
  46.                              CompareFirstName(my_vector[i].first_name));   
  47.     	std::cout << "First_Name: " << my_vector[i].first_name << "\tCOUNT: " << my_count << std::endl;
  48.   }
  49.   return 0;
  50. }
Success #stdin #stdout 0s 3460KB
comments (?)
stdin 
Standard input is empty
stdout 
First_Name: David	COUNT: 2
First_Name: Jhon	COUNT: 2
First_Name: Jams	COUNT: 1
First_Name: David	COUNT: 2
First_Name: Jhon	COUNT: 2
https://ideone.com/QknySG
language:
C++14 (clang 8.0)
created:
9 years ago
visibility:
public

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