Re: iterating over a collection with foreach

From:
Carl Barron <cbarron413@adelphia.net>
Newsgroups:
comp.lang.c++.moderated
Date:
Thu, 7 Feb 2008 23:12:40 CST
Message-ID:
<070220081827180480%cbarron413@adelphia.net>
In article <foehj8$ev2$1@newsserver.cilea.it>, Lorenzo Bettini
<bettini@dsi.unifi.it> wrote:

Hi

I'd like to iterate over a collection of objects and for each object in
the collection I'd like to invoke a specific method, see the following
code (I'd like to call the method m on each Item in the list)

#include <iostream>
#include <algorithm>
#include <list>

using namespace std;

struct Item {
   m() { cout << "Item::m" << endl; }
};

typedef list<Item> ItemList;

int main() {
   ItemList mylist;

   mylist.push_back(Item());
   mylist.push_back(Item());
   mylist.push_back(Item());

   foreach(mylist.begin(), mylist.end(), Item::m());

   return 0;
}

However, this code does not work (I think it might work using some boost
libraries but I'd like it to work with only STL).

I guees there are some "adjustments" with some other STL classes, am I
right?

many thanks in advance
 Lorenzo

P.S. of course I might write a for loop manually, but I'd like the more
compact foreach version :-)


std::for_each(my_list.begin(),my_list.end(),std::mem_fun_ref(&Item::m));

does it with c++98.

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