chapter11-6.cpp

C++STL程序员开发指南

//文件名:CHAPTER11-6.cpp
#include <vector>
#include <list>
#include <algorithm>
#include <iostream>
// Return whether second element is twice the first
bool twice ( int elem1, int elem2 )
{   return elem1 * 2 == 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 <= 7 ; 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;
   // Testing v1 and L1 for mismatch under identity
   pair<vector <int>::iterator, list <int>::iterator> results1;
   results1 = mismatch (v1.begin( ), v1.end( ), L1.begin( ));
   if ( results1.first == v1.end( ) ) cout << "The two ranges do not differ."<< endl;
   else
      cout << "The fist mismatch is between "<< *results1.first << " & " << *results1.second<< endl;
   // Modifying L1
   L1_inIter = L1.begin( );
   L1_inIter++;
   L1_inIter++;
   L1.insert(L1_inIter, 100);
   cout << "Modified L1 = ( " ;
   for ( L1_Iter = L1.begin( ) ; L1_Iter!= L1.end( ) ; L1_Iter++ ) cout << *L1_Iter << " ";
   cout << ")" << endl;
   // Testing v1 with modified L1 for mismatch under identity
   results1 = mismatch ( v1.begin( ), v1.end( ), L1.begin( ) );
   if ( results1.first == v1.end( ) ) cout << "The two ranges do not differ."<< endl;
   else    cout << "The fist mismatch is between "
           << *results1.first << " & " << *results1.second<< endl;
   // Test v1 and v2 for mismatch under the binary predicate twice
   pair<vector <int>::iterator, vector <int>::iterator> results2;
   results2 = mismatch ( v1.begin( ), v1.end( ), v2.begin( ), twice );
   if ( results2.first == v1.end( ) )
      cout << "The two ranges do not differ under the binary "<< "predicate twice." << endl;
   else
      cout << "The fist mismatch is between "<< *results2.first << " & " << *results2.second<< endl;
}