Hi Roman Thanks! 
It works and thanks for Phoenix advice!
Mn




Date: Wed, 11 Nov 2009 13:20:26 +0100
From: roman.perepelitsa@gmail.com
To: boost-users@lists.boost.org
Subject: Re: [Boost-users] doubt on lambda expression

2009/11/11 Emanuele Rocci <rocciemanuele@hotmail.com>
Hi All
I started playing with boost::lambda and I need some help or some clarification about it
or some hint to better understanding how does it work.

I have this piece of code

using namespace boost::lambda;
using boost::lambda::var;

int main(int argc, char** argv) {
   std::vector< int > myList;
   myList.push_back(100);
   myList.push_back(200);    
   int interval = 20;

   std::for_each( myList.begin(), myList.end(),
        (
        std::cout << "value: " << _1 << "\n",
        std::cout << "interval: " << var( interval ) << "\n",
        var( interval )++
        ));
}

Instead of
  std::cout << "value: " << _1 << "\n",
do this
  std::cout << constant("value: ") << _1 << "\n",

It's described here: http://www.boost.org/doc/libs/1_40_0/doc/html/lambda/using_library.html#lambda.introductory_examples.

By the way, if you are just starting with lambda, it's better to use Boost.Phoenix instead.

Roman Perepelitsa.


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