Hi, I'm not sure if this has already been done but I have created a new Boost.Range adapter that will return a specified member variable of the class in the range, similar to the existing map_keys and map_values adapters. Would there be interest in this? For example consider the following code: #include <boost/range/adaptor/member.hpp> #include <boost/range/algorithm/copy.hpp> #include <boost/lexical_cast.hpp> #include <iostream> #include <vector> #include <string> struct A { int foo; std::string bar; }; int main(int argc, char* argv[]) { std::vector< A > input; for ( int i = 0; i < 10; ++i ) { A a; a.foo = i; a.bar = boost::lexical_cast< std::string >( i * 10 ); input.push_back( a ); } boost::copy( input | boost::adaptors::selected_member( &A::foo ), std::ostream_iterator< int >( std::cout, "," ) ); std::cout << std::endl; boost::copy( input | boost::adaptors::selected_member( &A::bar ), std::ostream_iterator< std::string >( std::cout, "," ) ); return 0; } Cheers, Mark