chapter10-5.cpp

来自「STL程序员开发指南源码」· C++ 代码 · 共 32 行

//文件名:CHAPTER10-5.cpp
#include <map>
#include <iostream>
#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
#endif
int main( )
{
   map <int, int> m1;
   int i;
   map <int, int> :: iterator m1_Iter;
   map <int, int> :: const_iterator m1_cIter;
   typedef pair <int, int> Int_Pair;
   m1.insert ( Int_Pair ( 1, 10 ) );
   m1.insert ( Int_Pair ( 2, 20 ) );
   m1.insert ( Int_Pair ( 3, 30 ) );
   m1_cIter = m1.end( );
   m1_cIter--;
   cout << "The value of the last element of m1 is:\n"<< m1_cIter -> second << endl;
      m1_Iter = m1.end( );
   m1_Iter--;
   m1.erase ( m1_Iter );
   // The following 2 lines would err because the iterator is const
   // m1_cIter = m1.end ( );
   // m1_cIter--;
   // m1.erase ( m1_cIter );
   m1_cIter = m1.end( );
   m1_cIter--;
   cout << "The value of the last element of m1 is now:\n"
        << m1_cIter -> second << endl;
}