VMS Help
CXXLSTD, Algorithms, remove_copy

 *Conan The Librarian

 			   Standard C++	Library
 		 Copyright 1996, Rogue Wave Software, Inc.

 NAME

   remove_copy  - Move desired elements to the front of a container,
   and return an iterator that describes where the sequence of desired
   elements ends.

 SYNOPSIS

   #include <algorithm>

   template <class InputIterator,
 	   class OutputIterator,
 	   class T>
   OutputIterator remove_copy (InputIterator first,
 			      InputIterator last,
 			      OutputIterator result,
 			      const T& value);

 DESCRIPTION

   The remove_copy algorithm copies all the elements referred to	by the
   iterator i	in the range [first, last) for which the following
   corresponding condition does not hold:	  *i  == value.
   remove_copy returns the end of	the resulting range.
   remove_copy	is stable, that	is, the	relative order of the elements
   in the resulting range is the same as their relative	order in the
   original range.   The	elements in the	original sequence are not
   altered by remove_copy.

 COMPLEXITY

   Exactly last1	- first1 applications of the corresponding predicate are
   done.

 EXAMPLE

   //
   // remove.cpp
   //
    #include <algorithm>
    #include <vector>
    #include <iterator>
    #include <iostream.h>

   template<class Arg>
   struct all_true : public unary_function<Arg, bool>
    {
     bool operator() (const Arg&) { return 1; }
    };

   int main ()
    {
     int	arr[10]	= {1,2,3,4,5,6,7,8,9,10};
     vector<int>	v(arr+0, arr+10);

     copy(v.begin(),v.end(),ostream_iterator<int,char>(cout," "));
     cout << endl << endl;
      //
      //	Remove the 7.
      //
     vector<int>::iterator result = remove(v.begin(), v.end(), 7);
      //
      //	Delete dangling	elements from the vector.
      //
     v.erase(result, v.end());

     copy(v.begin(),v.end(),ostream_iterator<int,char>(cout," "));
     cout << endl << endl;
      //
      //	Remove everything beyond the fourth element.
      //
     result = remove_if(v.begin()+4, v.begin()+8, all_true<int>());
      //
      //	Delete dangling	elements.
      //
     v.erase(result, v.end());

     copy(v.begin(),v.end(),ostream_iterator<int,char>(cout," "));
     cout << endl << endl;
      //
      //	Now remove all 3s on output.
      //
      remove_copy(v.begin(), v.end(),
 		    ostream_iterator<int,char>(cout," "), 3);
     cout << endl << endl;
      //
      //	Now remove everything satisfying predicate on output.
      //	Should yield a NULL vector.
      //
     remove_copy_if(v.begin(), v.end(),
 		      ostream_iterator<int,char>(cout,"	"),
 		   all_true<int>());

     return 0;
    }

   Output :
   1 2 3	4 5 6 7	8 9 10
   1 2 3	4 5 6 8	9 10
   1 2 3	4
   1 2 4

 WARNING

   If your compiler does	not support default template parameters, you
   need to always supply	the Allocator template argument.  For
   instance,	you will need to write :

   vector<int, allocator<int> >

   instead of :

   vector<int>

 SEE ALSO

   remove, remove_if, remove_copy_if

 STANDARDS CONFORMANCE
   ANSI X3J16/ISO WG21 Joint C++	Committee
  Close     Help