[Boost-users] A question on for_each() and placeholder.Can any one with kindness help me?

By using Dev-C++, I used lambda expression, I want to know that if I white: typedef std::vector<int> vect1; std::vector<vect1> vect2; vect2 vect2Instance; then std::for_each(vect2Instance.begin(),vect2Instance.end(), std::for_each(_1.begin(),_1.end(),_1+=2)); is legal or not? And if legal ,Does the first two _1's mean a number in vect2 (i.e. a vect1) and the last _1 is a number in vect1(i.e. a int)? Can any one with kindness help me?