Help and Support
 

powered byLive Search

STL Sample for the Generate Function

Retired KB ArticleThis article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
Article ID:156079
Last Review:November 18, 2003
Revision:2.0
This article was previously published under Q156079
On This Page

SUMMARY

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

Back to the top

MORE INFORMATION

Required Header

<algorithm>

Back to the top

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.

Back to the top

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.

Back to the top

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 }

Back to the top

REFERENCES

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

Back to the top


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

Back to the top

Keywords: 
kbcode kbhowto KB156079

Back to the top

Article Translations

 

Other Support Options

  • Need More Help?
    Contact a Support professional by E-mail, Online or Phone.
  • Customer Service
    For non-technical assistance with product purchases, subscriptions, online services, events, training courses, corporate sales, piracy issues, and more.
  • Newsgroups
    Pose a question to other users. Discussion groups and Forums about specific Microsoft products, technologies, and services.