Class template unwrap_recursive

Class template unwrap_recursive_wrapper

boost::unwrap_recursive_wrapper —

Unwraps the specified argument if given a specialization of recursive_wrapper.

template<typename T> 
class unwrap_recursive_wrapper {
public:
  // types
  typedef unspecified type;
};

type is equivalent to T::type if T is a specialization of recursive_wrapper. Otherwise, type is equivalent to T.