[Boost-users] Boost.lambda: can I do this with a lambda function (multiplestatements?

Subject: [Boost-users] Boost.lambda: can I do this with a lambda function (multiplestatements?
From: Joost Kraaijeveld (J.Kraaijeveld_at_[hidden])
Date: 2009-02-03 13:31:01

Hi,

I want to embed some debug printing in a lambda function which is a
predicate used to remove elements from a vector like this:

collection.erase( std::remove_if(
                          collection.begin(),
                          collection.end(),
                          boost::lambda::if_then_else_return(
                             boost::lambda::_1 <= "s5", // if
                             (std::cout << "deleted: " <<  boost::lambda::_1, true), // then
                             (std::cout << "not deleted: " <<  boost::lambda::_1, false ))), // else
                  collection.end());

This actually compiles, runs and removes all the right elements but it
does not print for every element it is checking.

It just prints "not deleted: deleted: s4s5s6s8" , the last string being
all the elements of the collection.

Is what I want possible and if so how?

TIA,

-- 
Groeten,
Joost Kraaijeveld
Askesis B.V.
Molukkenstraat 14
6524NB Nijmegen
tel: [phone]
fax: [phone]
web: www.askesis.nl