Q156744: INFO: STL Sample for the replace_copy_if Function
Article: Q156744
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: 27-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 replace_copy_if STL function in
Visual C++.
MORE INFORMATION
================
Required Header
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<algorithm>
Prototype
---------
template<class ForwardIterator, class OutputIterator, class Predicate,
class Type> inline
OutputIterator replace_copy_if(ForwardIterator first,
ForwardIterator last,
OutputIterator result,
Predicate pred,
const T& new_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 replace_copy_if algorithm copies all elements from the range [first, last) to
a same-size range starting at result, replacing all occurrences that cause the
predicate to return true with new_value in the resulting sequence. It returns an
iterator positioned immediately after the last new element in the resulting
sequence.
Sample Code
-----------
NOTE: The first line in the sample code section says:
// Compile options needed: /GX
Add this comment right after this line: In VC++ .NET, /EHsc is set by default and
is equivalent to /GX.
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: /GX
//
// replace_copy_if.cpp : Illustrates how to use the replace_copy_if
// function.
//
// Functions:
//
// replace_copy_if - Copy the elements of a sequence to another
// same-size sequence replacing any elements
// that satisfies a predicate, with another value.
//
// 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
// replacing any item that >= 10 with 30
last = replace_copy_if(start, end, resultIt,
bind2nd(greater_equal<int>(), 10), 30) ;
//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 = 8
Result { 30 30 30 30 30 7 9 30 }
REFERENCES
==========
Visual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.
Additional query words: STL STLSample replace_copy_if
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Keywords : kbcode kbVC420 kbVC500 kbVC600 kbDSupport
Technology : kbVCsearch kbAudDeveloper kbVCLibrary
Version : :4.2,5.0,6.0
Issue type : kbinfo
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