From b2394e32c510fdf6974809747ccd859f0b552f8b Mon Sep 17 00:00:00 2001
From: bolero-MURAKAMI <bolero.murakami@gmail.com>
Date: Mon, 23 Apr 2012 21:44:47 +0900
Subject: [PATCH] fix io sprout::string output

---
 sprout/io.hpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sprout/io.hpp b/sprout/io.hpp
index abbb439c..9325aa97 100644
--- a/sprout/io.hpp
+++ b/sprout/io.hpp
@@ -700,6 +700,16 @@ namespace sprout {
 		{
 			return sprout::to_string(holder.value());
 		}
+		template<
+			typename Elem, std::size_t N, typename T,
+			typename sprout::enabler_if<sprout::is_string<T>::value>::type = sprout::enabler
+		>
+		inline SPROUT_CONSTEXPR auto
+		eval(sprout::io::format_holder<T> const& holder)
+			-> decltype(holder.value())
+		{
+			return holder.value();
+		}
 
 		//
 		// output