chapter9-10.cpp

C++STL程序员开发指南

//文件名:CHAPTER9-10.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( )
{
   multiset <int> ms1;
   multiset <int>::iterator ms1_Iter;
   multiset <int>::reverse_iterator ms1_rIter;
   multiset <int>::const_reverse_iterator ms1_crIter;
   ms1.insert( 10 );
   ms1.insert( 20 );
   ms1.insert( 30 );
   ms1_rIter = ms1.rend( ) ;
   ms1_rIter--;
   cout << "The last element in the reversed multiset is "
        << *ms1_rIter << "." << endl;
   // end can be used to terminate an interation throught a multiset in a forward order
   cout << "The multiset is: ";
   for ( ms1_Iter = ms1.begin( ) ; ms1_Iter != ms1.end( ); ms1_Iter++ )
      cout << *ms1_Iter << " ";
   cout << "." << endl;
   // rend can be used to terminate an interation throught a multiset in a reverse order
   cout << "The reversed multiset is: ";
   for ( ms1_rIter = ms1.rbegin( ) ; ms1_rIter != ms1.rend( ); ms1_rIter++ )
      cout << *ms1_rIter << " ";
   cout << "." << endl;
   ms1_rIter = ms1.rend( );
   ms1_rIter--;
   ms1.erase ( *ms1_rIter );
   ms1_rIter = ms1.rend( );
   cout << "After the erasure, the last element in the "
        << "reversed multiset is " << *ms1_rIter << "." << endl;
}