Transform array to pair : transform « STL Algorithms Modifying sequence operations « C++ Tutorial

1. C++ Tutorial
2. STL Algorithms Modifying sequence operations
3. transform

#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
#include <utility>

using namespace std;

typedef pair<int,string> Pair;

inline bool less_than_second( const Pair& b1, const Pair& b2 ){
   return b1.second < b2.second;
}

int main( )
{
   const char* names[] = { "A","B", "C", "D","E" };
   const int values[] = { 18, 20, 26, 30, 41 };
   const int num_pairs = sizeof( names ) / sizeof( names[0] );

   vector<Pair> pair( num_pairs );
   transform( values, values+num_pairs, names,pair.begin(), make_pair<int,string> );

   if( pair[1].first > pair[3].first )
      cout << pair[1].second << " > " << pair[3].second << endl;
   else if( pair[1].first == pair[3].first )
      cout << pair[1].second << " == " << pair[3].second << endl;
   else
      cout << pair[1].second << " < " << pair[3].second << endl;

}