chapter10-20.cpp

C++STL程序员开发指南

//文件名:CHAPTER10-20.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;
   typedef pair <int, int> Int_Pair;
   m1.insert ( Int_Pair ( 1, 1 ) );
   m1.insert ( Int_Pair ( 2, 4 ) );
   i = m1.size( );
   cout << "The size of the map is initially "<< i  << "." << endl;
   m1.clear( );
   i = m1.size( );
   cout << "The size of the map after clearing is " << i << "." << endl;
}