fig23_36.cpp

是有关C++编程原理教程的例子程序,全,应该对大家有所帮助

// Fig. 23.36: Fig23_36.cpp
// Standard Library functions lower_bound, upper_bound and 
// equal_range for a sorted sequence of values.
#include <iostream>
using std::cout;
using std::endl;

#include <algorithm> // algorithm definitions
#include <vector> // vector class-template definition
#include <iterator> // ostream_iterator

int main()
{
   const int SIZE = 10;
   int a1[ SIZE ] = { 2, 2, 4, 4, 4, 6, 6, 6, 6, 8 };
   std::vector< int > v( a1, a1 + SIZE ); // copy of a1
   std::ostream_iterator< int > output( cout, " " );

   cout << "Vector v contains:\n";
   std::copy( v.begin(), v.end(), output );

   // determine lower-bound insertion point for 6 in v
   std::vector< int >::iterator lower;
   lower = std::lower_bound( v.begin(), v.end(), 6 );
   cout << "\n\nLower bound of 6 is element " 
      << ( lower - v.begin() ) << " of vector v";

   // determine upper-bound insertion point for 6 in v
   std::vector< int >::iterator upper;
   upper = std::upper_bound( v.begin(), v.end(), 6 );
   cout << "\nUpper bound of 6 is element " 
      << ( upper - v.begin() ) << " of vector v";

   // use equal_range to determine both the lower- and 
   // upper-bound insertion points for 6
   std::pair< std::vector< int >::iterator, 
              std::vector< int >::iterator > eq;
   eq = std::equal_range( v.begin(), v.end(), 6 );
   cout << "\nUsing equal_range:\n   Lower bound of 6 is element "
      << ( eq.first - v.begin() ) << " of vector v";
   cout << "\n   Upper bound of 6 is element "
      << ( eq.second - v.begin() ) << " of vector v";
   cout << "\n\nUse lower_bound to locate the first point\n"
      << "at which 5 can be inserted in order";

   // determine lower-bound insertion point for 5 in v
   lower = std::lower_bound( v.begin(), v.end(), 5 );
   cout << "\n   Lower bound of 5 is element " 
      << ( lower - v.begin() ) << " of vector v";
   cout << "\n\nUse upper_bound to locate the last point\n"
      << "at which 7 can be inserted in order";

   // determine upper-bound insertion point for 7 in v
   upper = std::upper_bound( v.begin(), v.end(), 7 );
   cout << "\n   Upper bound of 7 is element " 
      << ( upper - v.begin() ) << " of vector v";
   cout << "\n\nUse equal_range to locate the first and\n"
      << "last point at which 5 can be inserted in order";

   // use equal_range to determine both the lower- and 
   // upper-bound insertion points for 5
   eq = std::equal_range( v.begin(), v.end(), 5 );
   cout << "\n   Lower bound of 5 is element "
      << ( eq.first - v.begin() ) << " of vector v";
   cout << "\n   Upper bound of 5 is element "
      << ( eq.second - v.begin() ) << " of vector v" << endl;            
   return 0;
} // end main

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