[Boost-users] [lambda]Predicate construction

I tried to create a predicate based on lambda expressions. The attempt failed with compiler errors so finally I created a struct to do the job. The problem is: I have a vector with pointers of objects of class Event. vector events and want to call find_if on the vector. The struct which does this is: struct event_locator: public unary_function { int tId; event_locator(const int tid) : tId(tid) {} const bool operator() (Event* e) { return e->hasTransaction() && e->getTransaction().getId() == tId; } }; The main problem in translating the code in the struct into lambda expressions is that I don't know how to call a method from the placeholder like:_1->hasTransaction(). I tried _1->* &Event::hasTransaction without success.