PairSetFirst.h

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#pragma once
 
#include <alib/set>
#include <alib/pair>
 
namespace dataAccess {
 
class PairSetFirst {
public:
    template < class First, class Second >
    static ext::set < First > access ( const ext::set < ext::pair < First, Second > > & pairSet ) {
        ext::set < First > res;
        for ( const ext::pair < First, Second > & pair : pairSet )
            res.insert ( pair.first );
 
        return res;
    }
 
};
 
} /* namespace dataAccess */