remove_if函数的使用【转】

//////////////////////////////////////////////////////////////////////
//
// 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";

}

http://support.microsoft.com/kb/168047/zh-tw