The sample code below illustrates how to use the
remove_copy, begin, and end STL functions in Visual C++.
Required header
Prototype
template<class ForwardIterator, class OutputIterator, class Type> inline
OutputIterator remove_copy(ForwardIterator first,
ForwardIterator last,
OutputIterator result,
const T& value) Note The class/parameter names in the prototype do not match the
version in the header file. Some have been modified to improve readability.
Description
The remove_copy algorithm copies all elements from the range
(first, last) to the range starting at result, skipping any element that
matches value. It returns an iterator positioned immediately after the last new
element.
Sample code
Note The first line in the sample code section says:
// Compile options needed: /GX
In VC++ .NET, /EHsc is set by default and is equivalent to /GX.
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: /GX
//
// remove_copy.cpp : 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.
//
// Written by Kalindi Sanghrajka
// of Microsoft Product Support Services,
// Software Core Developer Support.
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////
// disable warning C4786: symbol greater than 255 character,
// okay to ignore
#pragma warning(disable: 4786)
// disable warning C4244: possible loss of data,
// okay to ignore
#pragma warning(disable: 4244)
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#if _MSC_VER > 1020 // if VC++ version is > 4.2
using namespace std; // std c++ libs implemented in std
#endif
void main()
{
const int MAX_ELEMENTS = 8 ;
// Define a template class vector of integers
typedef vector<int, allocator<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 ;
} Program Output is:
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 } For the same topic about remove_copy, visit the following
MSDN Web site:
http://msdn.microsoft.com/en-us/library/as214b2s(VS.80).aspx
(http://msdn.microsoft.com/en-us/library/as214b2s(VS.80).aspx)