[Boost-users] [lambda] Using a reference in an expression

How does one use a reference in a lambda expression? The documentation says that "var" does, but it clearly doesn't. For example this fails to compile because it can't access the copy constructor: #include namespace bll = boost::lambda; class sample { public: sample() { } sample& operator<<( int ) { return(*this); } private: sample( const sample& ); }; void test() { typedef std::vector<int> V; V v; sample s; std::for_each(v.begin(), v.end(), bll::var(s) << bll::_1); }; -- Bill