fig20_20.cpp

来自「这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to pr」· C++ 代码 · 共 55 行

// Fig. 20.20: fig20_20.cpp
// Testing Standard Library class set
#include <iostream>

using std::cout;
using std::endl;

#include <set>
#include <algorithm>

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

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

   std::pair< double_set::const_iterator, bool > p;

   p = doubleSet.insert( 13.8 ); // value not in set
   cout << '\n' << *( p.first ) 
        << ( p.second ? " was" : " was not" ) << " inserted";
   cout << "\ndoubleSet contains: ";
   std::copy( doubleSet.begin(), doubleSet.end(), output );

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

   cout << endl;
   return 0;
}


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