From 1766ed43a4f85431e0c7cbe3ab9bb3cecfced18c Mon Sep 17 00:00:00 2001
From: bolero-MURAKAMI <bolero.murakami@gmail.com>
Date: Fri, 13 Apr 2012 23:32:34 +0900
Subject: [PATCH] add move_if_noexcept

---
 sprout/utility/move.hpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/sprout/utility/move.hpp b/sprout/utility/move.hpp
index 022c7da2..80f4817c 100644
--- a/sprout/utility/move.hpp
+++ b/sprout/utility/move.hpp
@@ -9,8 +9,20 @@ namespace sprout {
 	// move
 	//
 	template<typename T>
-	inline SPROUT_CONSTEXPR typename std::remove_reference<T>::type&& move(T&& t) SPROUT_NOEXCEPT {
-		return static_cast<typename std::remove_reference<T>::type&&>(t);
+	inline SPROUT_CONSTEXPR typename std::remove_reference<T>::type&& move(T&& x) SPROUT_NOEXCEPT {
+		return static_cast<typename std::remove_reference<T>::type&&>(x);
+	}
+
+	//
+	// move_if_noexcept
+	//
+	template<typename T>
+	inline SPROUT_CONSTEXPR typename std::conditional<
+		!std::is_nothrow_move_constructible<T>::value && std::is_copy_constructible<T>::value,
+		T const&,
+		T&&
+	>::type move_if_noexcept(T& x) SPROUT_NOEXCEPT {
+		return sprout::move(x);
 	}
 }	// namespace sprout