set.insert returns pair: p.first represents location and p.second represents the successfulness : set insert « set multiset « C++ Tutorial

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C++ Tutorial » set multiset » set insert 
19.5.2.set.insert returns pair: p.first represents location and p.second represents the successfulness
#include <iostream>
using std::cout;
using std::endl;

#include <set>

#include <algorithm>
#include <iterator> // ostream_iterator

int main()
{
   double a2.14.29.52.13.7 };
   std::set< double, std::less< double > > doubleSeta, a + );;
   std::ostream_iterator< double > outputcout, " " );

   // p represents pair containing const_iterator and bool
   std::pair< std::set< double, std::less< double > >::const_iterator, bool > p;

   p = doubleSet.insert13.8 )// value not in set
   cout << *p.first << p.second ? " was" " was not" << " inserted";
   cout << "\ndoubleSet contains: ";
   std::copydoubleSet.begin(), doubleSet.end(), output );


   cout << endl;
   return 0;
}
13.8 was inserted
doubleSet contains: 2.1 3.7 4.2 9.5 13.8
19.5.set insert
19.5.1.Use insert() to add element to a set
19.5.2.set.insert returns pair: p.first represents location and p.second represents the successfulness
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