From 5bf09079743dac3611a073e59e190b19b70db1d1 Mon Sep 17 00:00:00 2001
From: bolero-MURAKAMI <bolero.murakami@gmail.com>
Date: Wed, 17 Feb 2016 10:06:43 +0900
Subject: [PATCH] add conversion to std::array

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

diff --git a/sprout/array/array.hpp b/sprout/array/array.hpp
index 8da39792..04063fc9 100644
--- a/sprout/array/array.hpp
+++ b/sprout/array/array.hpp
@@ -67,6 +67,12 @@ namespace sprout {
 		}
 	public:
 		value_type elems[static_size ? static_size : 1];
+	private:
+		template<sprout::index_t... Indexes>
+		SPROUT_CONSTEXPR std::array<T, N>
+		to_std_array(sprout::index_tuple<Indexes...>) const {
+			return std::array<T, N>{{elems[Indexes]...}};
+		}
 	public:
 		// construct/copy/destroy:
 		template<typename T2>
@@ -258,6 +264,10 @@ namespace sprout {
 			return sprout::distance(begin(), p);
 		}
 #endif
+
+		SPROUT_CONSTEXPR operator std::array<T, N>() const {
+			return to_std_array(sprout::make_index_tuple<N>::make());
+		}
 	};
 	template<typename T, std::size_t N>
 	SPROUT_CONSTEXPR_OR_CONST typename sprout::array<T, N>::size_type sprout::array<T, N>::static_size;