fig23_20.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 23.20: Fig23_20.cpp
// Standard Library class set test program.
#include <iostream>
using std::cout;
using std::endl;

#include <set>

// define short name for set type used in this program
typedef std::set< double, std::less< double > > DoubleSet;

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

int main()
{
   const int SIZE = 5;
   double a[ SIZE ] = { 2.1, 4.2, 9.5, 2.1, 3.7 };   
   DoubleSet doubleSet( a, a + SIZE );;
   std::ostream_iterator< double > output( cout, " " );

   cout << "doubleSet contains: ";
   std::copy( doubleSet.begin(), doubleSet.end(), output );

   // p represents pair containing const_iterator and bool
   std::pair< DoubleSet::const_iterator, bool > p;

   // insert 13.8 in doubleSet; insert returns pair in which 
   // p.first represents location of 13.8 in doubleSet and 
   // p.second represents whether 13.8 was inserted
   p = doubleSet.insert( 13.8 ); // value not in set
   cout << "\n\n" << *( p.first ) 
      << ( p.second ? " was" : " was not" ) << " inserted";
   cout << "\ndoubleSet contains: ";
   std::copy( doubleSet.begin(), doubleSet.end(), output );

   // insert 9.5 in doubleSet
   p = doubleSet.insert( 9.5 ); // value already in set
   cout << "\n\n" << *( p.first ) 
      << ( p.second ? " was" : " was not" ) << " inserted";
   cout << "\ndoubleSet contains: ";
   std::copy( doubleSet.begin(), doubleSet.end(), output );
   cout << endl;
   return 0;
} // end main

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