Function init

extern/boost/boost/thread/future.hpp:5550–5561

      return res;
    }
    void init() {
      if (! run_deferred())
      {
        future_when_all_vector_shared_state::run(this->shared_from_this());
        return;
      }
#ifdef BOOST_THREAD_FUTURE_BLOCKING
      this->thr_ = boost::thread(&future_when_all_vector_shared_state::run, this->shared_from_this());
#else
      boost::thread(&future_when_all_vector_shared_state::run, this->shared_from_this()).detach();
#endif
    }

  public:
    template< typename InputIterator>