remove_copy (STL Samples)

Veranschaulicht, wie die Funktion remove_copy Standardvorlagenbibliothek (STL) in Visual C++ verwendet.

template<class ForwardIterator, class OutputIterator, class Type> inline
   OutputIterator remove_copy(
      ForwardIterator First,
      ForwardIterator Last,
      OutputIterator Result,
      const T& Value
   )

Hinweise

Hinweis
Die Klasse/Parameternamen im Prototyp stimmen nicht mit der Version in der Headerdatei ab.Einige wurden geändert, um die Lesbarkeit zu verbessern.

Der Algorithmus remove_copy kopiert alle Elemente aus dem Bereich (First, Last) auf den Bereich, der im Ergebnisbeginnt und überspringt alle dieses Element entspricht Value.Sie gibt einen Iterator zurück, der unmittelbar hinter dem letzten neuen Element positioniert wird.

Beispiel

// remove_copy.cpp
// compile with: /EHsc
// Illustrates how to use the remove_copy function.
//
// Functions:
//   remove_copy - copy the elements of a sequence to another sequence
//                 eliminating any elements that match value.
//   begin - Returns an iterator that points to the first element in a
//           sequence.
//   end - Returns an iterator that points one past the end of a sequence.
//////////////////////////////////////////////////////////////////////

// disable warning C4786: symbol greater than 255 character,
// okay to ignore
#pragma warning(disable: 4786)

#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>

using namespace std;


int main()
{
   const int MAX_ELEMENTS = 8 ;

   // Define a template class vector of integers
   typedef vector<int > IntVector ;

   //Define an iterator for template class vector of integer
   typedef IntVector::iterator IntVectorIt ;

   //vector containing numbers
   IntVector Numbers(MAX_ELEMENTS), Result(MAX_ELEMENTS) ;

   IntVectorIt start, end, it, last, resultIt ;

   //Initialize vector Numbers
   Numbers[0] = 10 ;
   Numbers[1] = 20 ;
      Numbers[2] = 10 ;
   Numbers[3] = 15 ;
   Numbers[4] = 12 ;
   Numbers[5] = 7 ;
   Numbers[6] = 9 ;
   Numbers[7] = 10 ;

   start = Numbers.begin() ;   // location of first
                               // element of Numbers

   end = Numbers.end() ;       // one past the location
                               // last element of Numbers

   resultIt = Result.begin() ; // location of first
                               // element of Result

   // print content of Numbers
   cout << "Numbers { " ;
   for(it = start; it != end; it++)
      cout << *it << " " ;
   cout << " }\n" << endl ;

   // copy all elements from Numbers to Result
   // skipping any item that equals 10
   last = remove_copy(start, end, resultIt, 10) ;

   //print number of elements copied to Result
   cout << "Total number of elements copied to Result = "
      << last - resultIt << endl ;

   start = Result.begin() ;   // location of first
                               // element of Result

   end = Result.end() ;       // one past the location
                              // last element of Result

   // print content of Result
   cout << "Result { " ;
   for(it = start; it != end; it++)
      cout << *it << " " ;
   cout << " }\n" << endl ;
}

Output

Numbers { 10 20 10 15 12 7 9 10  }

Total number of elements copied to Result = 5
Result { 20 15 12 7 9 0 0 0  }

Anforderungen

Header: <algorithm>

Siehe auch

Konzepte

Standardvorlagenbibliotheks-Beispiele