chapter11-24.cpp

C++STL程序员开发指南

//文件名:CHAPTER11-24.cpp
#include <vector>
#include <list>
#include <algorithm>
#include <iostream>
// Return whether second element is twice the first
bool twice ( int elem1, int elem2 )
{   return 2 * elem1 < elem2;}
int main( )
{
   using namespace std;
   vector <int> v1, v2;
   list <int> L1;
   vector <int>::iterator Iter1, Iter2;
   list <int>::iterator L1_Iter, L1_inIter;
   int i;
   for ( i = 0 ; i <= 5 ; i++ )
   {      v1.push_back( 5 * i );   }
   int ii;
   for ( ii = 0 ; ii <= 6 ; ii++ )
   {      L1.push_back( 5 * ii );   }
   int iii;
   for ( iii = 0 ; iii <= 5 ; iii++ )
   {      v2.push_back( 10 * iii );   }
   cout << "Vector v1 = ( " ;
   for ( Iter1 = v1.begin( ) ; Iter1 != v1.end( ) ; Iter1++ )
      cout << *Iter1 << " ";
   cout << ")" << endl;
   cout << "List L1 = ( " ;
   for ( L1_Iter = L1.begin( ) ; L1_Iter!= L1.end( ) ; L1_Iter++ )
      cout << *L1_Iter << " ";
   cout << ")" << endl;
   cout << "Vector v2 = ( " ;
   for ( Iter2 = v2.begin( ) ; Iter2 != v2.end( ) ; Iter2++ )
      cout << *Iter2 << " ";
      cout << ")" << endl;
   // Self lexicographical_comparison of v1 under identity
   bool result1;
   result1 = lexicographical_compare (v1.begin( ), v1.end( ),
                  v1.begin( ), v1.end( ) );
   if ( result1 )
      cout << "Vector v1 is lexicographically_less than v1." << endl;
   else
      cout << "Vector v1 is not lexicographically_less than v1." << endl;
   // lexicographical_comparison of v1 and L2 under identity
   bool result2;
   result2 = lexicographical_compare (v1.begin( ), v1.end( ),L1.begin( ), L1.end( ) );
   if ( result2 )
      cout << "Vector v1 is lexicographically_less than L1." << endl;
   else
      cout << "Vector v1 is lexicographically_less than L1." << endl;
   bool result3;
   result3 = lexicographical_compare (v1.begin( ), v1.end( ),v2.begin( ), v2.end( ), twice );
   if ( result3 )
      cout << "Vector v1 is lexicographically_less than v2 "<< "under twice." << endl;
   else
      cout << "Vector v1 is not lexicographically_less than v2 "<< "under twice." << endl;
}