Hi, In C++0x const R& shared_future::get() const; R& shared_future<R&>::get() const; void shared_future<void>::get() const; In the documentation We found in the synopsis class R get(); in the Member function get() const R& get(); in the description Effects:If *this is associated with an asynchronous result, waits until the result is ready as-if by a call to jss::shared_future<R>::wait(), and returns a const reference to the result. Returns:If the result type R is a reference, returns the stored reference. If R is void, there is no return value. Otherwise, returns a const reference to the value stored in the asynchronous result. In the code we have R get() There is a lot of incoherences. Which is the correct one? Vicente