chapter9-17.cpp

C++STL程序员开发指南

//文件名:CHAPTER9-17.cpp
#include <set>
#include <iostream>
#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
#endif
int main( )
{
   set <int>::iterator s1_pIter, s2_pIter;
   set <int, less<int> > s1, s2;
   s1.insert( 10 );
   s1.insert( 20 );
   s1.insert( 30 );
   s1.insert( 40 );
   cout << "The original s1 =";
   for ( s1_pIter = s1.begin( ); s1_pIter != s1.end( ); s1_pIter++ )
      cout << " " << *s1_pIter;
   cout << "." << endl;
   pair< set<int>::iterator, bool > pr;
   pr = s1.insert( 10 );
   if(pr.second == true){ cout << "The element 10 was inserted in s1 successfully."<< endl; }
   else{ cout << "The element 10 already exists in s1 and"<< " *( pr.first ) = " << *( pr.first ) << "." << endl;}
   s1.insert( --s1.end( ), 50 );
   cout << "After the insertions, s1 =";
   for ( s1_pIter = s1.begin( ); s1_pIter != s1.end( ); s1_pIter++ )
      cout << " " << *s1_pIter;
   cout << "." << endl;
   s2.insert( 100 );
   cout << "s2 =";
   for ( s2_pIter = s2.begin( ); s2_pIter != s2.end( ); s2_pIter++ )
      cout << " " << *s2_pIter;
   cout << "." << endl;
}