Lambda Expression vs Functor in C++

Question

I wonder where should we use lambda expression over functor in C++. To me, these two techniques are basically the same, even functor is more elegant and cleaner tha

Answer 1

Lambdas are basically just syntactic sugar that implement functors (NB: closures are not simple.) In C++0x, you can use the auto keyword to store lambdas locally, and std::function will enable you to store lambdas, or pass them around in a type-safe manner.

Check out the Wikipedia article on C++0x.