DOCUMENT:Q156079  07-MAY-2001  [visualc]
TITLE   :STL Sample for the Generate Function
PRODUCT :Microsoft C Compiler
PROD/VER:winnt:4.2
OPER/SYS:
KEYWORDS:_IK

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-------------------------------------------------------------------------------
The information in this article applies to:

 - The Standard C++ Library, included with:
    - Microsoft Visual C++, 32-bit Enterprise Edition, version 4.2 
    - Microsoft Visual C++, 32-bit Professional Edition, version 4.2 
-------------------------------------------------------------------------------

SUMMARY
=======

The sample code below illustrates how to use the generate STL function in Visual
C++.

MORE INFORMATION
================

Required Header
---------------

   <algorithm>

Prototype
---------

   template<class InputIterator, class Function> inline
       Function for_each(InputIterator first,
                         InputIterator last,
                         Function F)
   template<class ForwardIterator, class Generator> inline
    void generate(ForwardIterator first, ForwardIterator last, Generator gen)

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 Generate algorithm traverses the range [first, last + 1), assigning to each
element the value returned by gen. Generate modifies the elements in the
specified range.

Sample Code
-----------

   ////////////////////////////////////////////////////////////////////// 
   // 
   // Compile options needed: /GX
   // 
   // generate.cpp : Illustrates how to use the generate function.
   // 
   // Functions:
   // 
   //   generate - Fill a sequence using a generator function
   //   Fibonacci - return the next Fibonacci number in the
   //               Fibonacci series.
   // 
   // 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)
   #include <iostream>
   #include <vector>
   #include <algorithm>
   using namespace std;
   // return the next Fibonacci number in the
   // Fibonacci series.
   int Fibonacci(void)
   {
       static int r;
       static int f1 = 0;
       static int f2 = 1;
       r = f1 + f2 ;
       f1 = f2 ;
       f2 = r ;
       return f1 ;
   }
   void main()
   {
       const int VECTOR_SIZE = 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 ;
       IntVector Numbers(VECTOR_SIZE) ;   //vector containing numbers
       IntVectorIt start, end, it ;
       start = Numbers.begin() ;   // location of first
                                   // element of Numbers
       end = Numbers.end() ;       // one past the location
                                   // last element of Numbers
       // fill the range [first, last +1) with a series of
       // Fibonnaci numbers using the Fibonacci function
       generate(start, end, Fibonacci) ;
       // print content of Numbers
       cout << "Numbers { " ;
       for(it = start; it != end; it++)
           cout << *it << " " ;
       cout << " }\n" << endl ;
   }

Program Output is:
Numbers { 1 1 2 3 5 8 13 21 }

REFERENCES
==========

Visual C++ Books Online; click "Visual C++ Books," "C/C++," then "Standard C++
Library Reference."

Additional query words: STL generate

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Keywords          : _IK 
Technology        : kbVCsearch kbAudDeveloper kbVCLibrary
Version           : winnt:4.2
Issue type        : kbhowto

=============================================================================

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