Article ID: 168047
Article Last Modified on 7/15/2005
APPLIES TO
- The Standard C++ Library, when used with:
- Microsoft Visual C++ 4.2 Enterprise Edition
- Microsoft Visual C++ 4.2 Professional Edition
- Microsoft Visual C++ 5.0 Enterprise Edition
- Microsoft Visual C++ 5.0 Professional Edition
- Microsoft Visual C++ 6.0 Enterprise Edition
- Microsoft Visual C++ 6.0 Professional Edition
- Microsoft Visual C++ 6.0 Standard Edition
This article was previously published under Q168047
SUMMARY
The sample code below illustrates how to use the [list::remove, list::remove_if] STL function(s) in Visual C++.
Note There are some differences in the implementation of the Standard C++ Library components in Visual C++ version 4.2 versus later revisions. The relevant sections of code below compile conditionally based upon the value of _MSC_VER.
MORE INFORMATION
Required header
<list> <string> <iostream>
Prototype
void remove(const T& x); void remove_if(binder2nd< not_equal_to<T> > pr);
Note The class/parameter names in the prototype may not match the version in the header file. Some have been modified to improve readability.
Description
This example shows how to use list::remove and list::remove_if. It also shows how to use list::remove_if with your own function.
Sample code
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: -GX
//
// remove.cpp : This example shows how to use list::remove and
// list::remove_if. It also shows how to use
// list::remove_if with your own function.
//
// Functions:
//
// list::remove
// list::remove_if
//
// Written by Andrew Bradnan
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////
#pragma warning(disable:4786) // disable spurious C4786 warnings
#include <list>
#include <string>
#include <iostream>
using namespace std;
#if _MSC_VER > 1020 // if later than revision 4.2
using namespace std; // std c++ libs are implemented in std
#endif
typedef list<string, allocator<string> > LISTSTR;
// Used to customize list::remove_if()
class is_four_chars
: public not_equal_to<string>
{
bool operator()(const string& rhs, const string&) const
{ return rhs.size() == 4; }
};
void main()
{
LISTSTR test;
LISTSTR::iterator i;
test.push_back("good");
test.push_back("bad");
test.push_back("ugly");
// good bad ugly
for (i = test.begin(); i != test.end(); ++i)
cout << *i << " ";
cout << endl;
test.remove("bad");
// good ugly
for (i = test.begin(); i != test.end(); ++i)
cout << *i << " ";
cout << endl;
// remove any not equal to "good"
test.remove_if(binder2nd<not_equal_to<string> >
(not_equal_to<string>(), "good"));
// good
for (i = test.begin(); i != test.end(); ++i)
cout << *i << " ";
cout << endl;
// Remove any strings that are four characters long
test.remove_if(binder2nd<not_equal_to<string> >
(is_four_chars(), "useless parameter"));
if (test.empty())
cout << "Empty list\n";
}
Program output
good bad ugly good ugly good Empty list
REFERENCES
For more information about list::remove and list::remove_if, visit the following MSDN Web sites:
http://msdn.microsoft.com/library/en-us/vcstdlib/html/vclrfListremove.asp?frame=true
http://msdn.microsoft.com/library/en-us/vcstdlib/html/vclrfListremoveif.asp?frame=true
Additional query words: STL STLSample [xxxx]
Keywords: kbhowto kbfunctions KB168047
