Use the list::remove, list::remove_if STL functions in Visual C++
This article provides information that how to use the list::remove
, list::remove_if
STL functions in Visual C++.
Original product version: Visual C++
Original KB number: 168047
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
.
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
// 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 web sites:
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