[Boost-users] Using lambda to count elements in list of lists

From: Daniel Lidström (daniel.lidstrom_at_[hidden])
Date: 2006-02-01 04:21:16

Hello!

I'm trying to use Boost.Lambda to count the total number of elements
in a list of lists. This example shows what I'm trying to do:

#include <boost/lambda/lambda.hpp>
#include <algorithm>
#include <list>

using namespace std;
using namespace boost::lambda;

int main()
{
   int count = 0;
   list<list<int> > ll;
   for_each(ll.begin(), ll.end(), var(count)+=(_1).size());
}

This will not compile: (13): error C2039: 'size': is not a member of
'boost::lambda::lambda_functor<T>'
Is this possible to do?
Thanks in advance!

Hälsningar,
Daniel