Method dispatch

test/beast/core/bind_handler.cpp:220–229

        template<class F, class Alloc>
        void
        dispatch(F&& f, Alloc const& a)
        {
            s_.on_invoke();
            net::prefer(ex_,
                net::execution::blocking.possibly,
                net::execution::allocator(a)).execute(std::forward<F>(f));
            // previously equivalent to
            // ex_.dispatch(std::forward<F>(f), a);
        }

        template<class F, class Alloc>
        void