From 14a8110d1f73628a0aa8a268a2d351caf1746399 Mon Sep 17 00:00:00 2001
From: Tomasz Grabiec <tgrabiec@cloudius-systems.com>
Date: Tue, 23 Jun 2015 12:02:23 +0200
Subject: [PATCH] future: Avoid copying of the result in get0()

Even though we accept std::tuple<T...>&&, 'x' is an l-value reference
inside get0().
---
 core/future.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/core/future.hh b/core/future.hh
index 4b404d0b18..d5dbb8a0a6 100644
--- a/core/future.hh
+++ b/core/future.hh
@@ -227,7 +227,7 @@ struct future_state {
     }
     using get0_return_type = std::tuple_element_t<0, std::tuple<T...>>;
     static get0_return_type get0(std::tuple<T...>&& x) {
-        return std::get<0>(x);
+        return std::get<0>(std::move(x));
     }
     void forward_to(promise<T...>& pr) noexcept {
         assert(_state != state::future);