fig23_28.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. 23.28: Fig23_28.cpp
// Standard Library functions remove, remove_if,
// remove_copy and remove_copy_if.
#include <iostream>
using std::cout;
using std::endl;

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

bool greater9( int ); // prototype

int main()
{ 
   const int SIZE = 10;
   int a[ SIZE ] = { 10, 2, 10, 4, 16, 6, 14, 8, 12, 10 };
   std::ostream_iterator< int > output( cout, " " );
   std::vector< int > v( a, a + SIZE ); // copy of a
   std::vector< int >::iterator newLastElement;
   
   cout << "Vector v before removing all 10s:\n   ";
   std::copy( v.begin(), v.end(), output );

   // remove all 10s from v
   newLastElement = std::remove( v.begin(), v.end(), 10 );
   cout << "\nVector v after removing all 10s:\n   ";
   std::copy( v.begin(), newLastElement, output );

   std::vector< int > v2( a, a + SIZE ); // copy of a
   std::vector< int > c( SIZE, 0 ); // instantiate vector c
   cout << "\n\nVector v2 before removing all 10s and copying:\n   ";
   std::copy( v2.begin(), v2.end(), output );

   // copy from v2 to c, removing 10s in the process
   std::remove_copy( v2.begin(), v2.end(), c.begin(), 10 );
   cout << "\nVector c after removing all 10s from v2:\n   ";
   std::copy( c.begin(), c.end(), output );

   std::vector< int > v3( a, a + SIZE ); // copy of a
   cout << "\n\nVector v3 before removing all elements"
        << "\ngreater than 9:\n   ";
   std::copy( v3.begin(), v3.end(), output );

   // remove elements greater than 9 from v3
   newLastElement = std::remove_if( v3.begin(), v3.end(), greater9 );
   cout << "\nVector v3 after removing all elements"
      << "\ngreater than 9:\n   ";
   std::copy( v3.begin(), newLastElement, output );

   std::vector< int > v4( a, a + SIZE ); // copy of a
   std::vector< int > c2( SIZE, 0 ); // instantiate vector c2
   cout << "\n\nVector v4 before removing all elements"
      << "\ngreater than 9 and copying:\n   ";
   std::copy( v4.begin(), v4.end(), output );
   
   // copy elements from v4 to c2, removing elements greater
   // than 9 in the process
   std::remove_copy_if( v4.begin(), v4.end(), c2.begin(), greater9 );
   cout << "\nVector c2 after removing all elements"
      << "\ngreater than 9 from v4:\n   ";
   std::copy( c2.begin(), c2.end(), output );
   cout << endl;
   return 0;
} // end main

// determine whether argument is greater than 9
bool greater9( int x )
{
   return x > 9;
} // end function greater9

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