Microsoft KB Archive/156345

= How to use the for_each, begin, and end STL function in Visual C++ =

Article ID: 156345

Article Last Modified on 12/30/2005

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APPLIES TO

 The Standard C++ Library, when used with:  Microsoft Visual C++ 4.2 Enterprise Edition

 Microsoft Visual C++ 5.0 Enterprise Edition

 Microsoft Visual C++ 6.0 Enterprise Edition

 Microsoft Visual C++ 4.2 Professional Edition</li></ul>

 Microsoft Visual C++ 5.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Standard Edition</li></ul>

 Microsoft Visual C++ 2005 Express Edition</li></ul>

 Microsoft Visual C++ .NET 2003 Standard Edition</li></ul>

 Microsoft Visual C++ .NET 2002 Standard Edition</li></ul> </li></ul>

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This article was previously published under Q156345

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SUMMARY
The sample code below illustrates how to use the for_each, begin, and end STL function in Visual C++.

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Prototype
template<class InputIterator, class Function> inline

Function for_each(InputIterator first,                        InputIterator last,                         Function F) 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 for_each algorithm calls Function F for each element in the range [first, last) and returns the input parameter F. This function does not modify any elements in the sequence.

Sample code
Note In the first line of the sample code section, /GX is equivalent to /EHsc in Visual C++ .NET or in Visual C ++ 2005 and is set by default. ////////////////////////////////////////////////////////////////////// // // Compile options needed: /GX // // count.cpp : Illustrates how to use the for_each function. // // Functions: // //  for_each  - Calls function F for every element in a range. // //  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


 * 1) pragma warning(disable: 4786)


 * 1) include
 * 2) include
 * 3) include

using namespace std; // std c++ libs implemented in std #endif
 * 1) if _MSC_VER > 1020  // if VC++ version is > 4.2

// prints the cube of integer n void PrintCube(int n)

{

cout << n * n * n << " " ;

}

void main

{

const int VECTOR_SIZE = 8 ;

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

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

IntVector Numbers(VECTOR_SIZE) ;  //vector containing numbers

IntVectorIt start, end, it ;

int i ;

// Initialize vector Numbers for (i = 0; i < VECTOR_SIZE; i++) Numbers[i] = i + 1 ;

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

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

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

// for each element in the range [first, last)   // print the cube of the element    for_each(start, end, PrintCube) ;    cout << "\n\n" ;

} Output: <pre class="fixed_text">Numbers { 1 2 3 4 5 6 7 8 }

1 8 27 64 125 216 343 512

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