Hi all I am trying to get familiar with boost lambda. Below I am using std::transform algorithm but when I try to call std::stringstream::str() function using lambda::bind I receive the following error message: TestBoost15Jul.cpp:49: error: no matching function for call to ‘bind(<unresolved overloaded function type>, const boost::reference_wrapper<std::basic_stringstream<char, std::char_traits<char>, std::allocator<char> > >)’ Do you also know if is the right way to return the string that must be stored in the second vector used by std::transform? Regards AFG // C++ #include <iostream> #include <algorithm> #include <vector> #include <sstream> #include <string> // boost #include <boost/assign.hpp> #include <boost/assign/list_of.hpp> #include <boost/assign/std/vector.hpp> #include <boost/lambda/core.hpp> #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/function.hpp> int main( int argc, char** argv ){ namespace bl = boost::lambda; using namespace boost::assign; std::vector< std::string > vIn = list_of("a")("b")("c")("d"); std::vector< std::string > vOut; std::stringstream outFmt; int nCount = 2; bl::var_type< int >::type _nCount( bl::var(nCount) ); bl::var_type< std::stringstream >::type _outFmt( bl::var(outFmt) ); std::transform( vIn.begin(), vIn.end(), vOut.begin(), ( _outFmt << bl::_1 << "=%" << _nCount << "%", _nCount++, bl::bind( &std::stringstream::str , boost::ref(outFmt) )() // this call to bind has some problem ) ); std::cout << outFmt.str() << std::endl; return 1; }