Article: Q156346
Product(s): Microsoft C Compiler
Version(s): 4.2,5.0,6.0
Operating System(s):
Keyword(s): kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Last Modified: 26-MAR-2002
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The information in this article applies to:
- The Standard C++ Library, used with:
- Microsoft Visual C++, 32-bit Enterprise Edition, versions 4.2, 5.0, 6.0
- Microsoft Visual C++, 32-bit Professional Edition, versions 4.2, 5.0, 6.0
- Microsoft Visual C++, 32-bit Learning Edition, version 6.0
- Microsoft Visual C++.NET (2002)
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SUMMARY
=======
The sample code below illustrates how to use the iter_swap, begin, and end STL
function in Visual C++.
MORE INFORMATION
================
Required Header
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<algorithm>
Prototype
---------
template<class ForwardIterator1, class ForwardIterator2> inline
void iter_swap(ForwardIterator1 first, ForwardIterator2 second)
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 iter_swap algorithm swaps two elements represented by two iterators.
Sample Code
-----------
NOTE: In the first line of the sample code section, /GX is equivalent to /EHsc in
VC++ .NET and is set by default.
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: /GX
//
// iter_swap.cpp : Illustrates how to use the iter_swap function.
//
// Functions:
//
// iter_swap - Swap two elements in a sequence represented by
// two iterators.
// 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)
#include <iostream>
#include <vector>
#include <algorithm>
#if _MSC_VER > 1020 // if VC++ version is > 4.2
using namespace std; // std c++ libs implemented in std
#endif
// 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
// Fibonacci numbers using the Fibonacci function
generate(start, end, Fibonacci) ;
cout << "Before calling iter_swap" << endl ;
// print content of Numbers
cout << "Numbers { " ;
for(it = start; it != end; it++)
cout << *it << " " ;
cout << " }\n" << endl ;
// swap the first and last elements of the
// sequence using iter_swap
iter_swap(start, end - 1) ;
cout << "After calling iter_swap" << endl ;
// print content of Numbers
cout << "Numbers { " ;
for(it = start; it != end; it++)
cout << *it << " " ;
cout << " }\n" << endl ;
}
The Program Output is:
Before calling iter_swap
Numbers { 1 1 2 3 5 8 13 21 }
After calling iter_swap
Numbers { 21 1 2 3 5 8 13 1 }
REFERENCES
==========
Visual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.
Additional query words: STL STLSample generate end begin
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Keywords : kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Technology : kbVCsearch kbAudDeveloper kbVCNET kbVCLibrary
Version : :4.2,5.0,6.0
Issue type : kbinfo
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