From b2daf0262c846007834bb2db107f4062af2b4d38 Mon Sep 17 00:00:00 2001
From: bolero-MURAKAMI <bolero.murakami@gmail.com>
Date: Sat, 5 Apr 2014 19:33:32 +0900
Subject: [PATCH] add nested_array

---
 sprout/array.hpp              |  1 +
 sprout/array/nested_array.hpp | 46 +++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 sprout/array/nested_array.hpp

diff --git a/sprout/array.hpp b/sprout/array.hpp
index 2f5b203d..ce024e7e 100644
--- a/sprout/array.hpp
+++ b/sprout/array.hpp
@@ -15,5 +15,6 @@
 #include <sprout/array/tuple.hpp>
 #include <sprout/array/make_array.hpp>
 #include <sprout/array/type_traits.hpp>
+#include <sprout/array/nested_array.hpp>
 
 #endif	// #ifndef SPROUT_ARRAY_HPP
diff --git a/sprout/array/nested_array.hpp b/sprout/array/nested_array.hpp
new file mode 100644
index 00000000..61ecd43b
--- /dev/null
+++ b/sprout/array/nested_array.hpp
@@ -0,0 +1,46 @@
+/*=============================================================================
+  Copyright (c) 2011-2014 Bolero MURAKAMI
+  https://github.com/bolero-MURAKAMI/Sprout
+
+  Distributed under the Boost Software License, Version 1.0. (See accompanying
+  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#ifndef SPROUT_ARRAY_NESTED_ARRAY_HPP
+#define SPROUT_ARRAY_NESTED_ARRAY_HPP
+
+#include <cstddef>
+#include <sprout/config.hpp>
+#include <sprout/array/array.hpp>
+#include <sprout/type_traits/identity.hpp>
+
+namespace sprout {
+	namespace detail {
+		template<typename T, std::size_t... Ns>
+		struct nested_array_t_impl;
+		template<typename T, std::size_t N>
+		struct nested_array_t_impl<T, N>
+			: public sprout::identity<sprout::array<T, N> >
+		{};
+		template<typename T, std::size_t N, std::size_t... Ms>
+		struct nested_array_t_impl<T, N, Ms...>
+			: public sprout::detail::nested_array_t_impl<sprout::array<T, N>, Ms...>
+		{};
+	}	// namespace detail
+	//
+	// nested_array_t
+	//
+	template<typename T, std::size_t... Ns>
+	struct nested_array_t
+		: public sprout::detail::nested_array_t_impl<T, Ns...>
+	{};
+
+#if SPROUT_USE_TEMPLATE_ALIASES
+	//
+	// nested_array
+	//
+	template<typename T, std::size_t... Ns>
+	using nested_array = typename sprout::nested_array_t<T, Ns...>::type;
+#endif	// #if SPROUT_USE_TEMPLATE_ALIASES
+}	// namespace sprout
+
+#endif	// #ifndef SPROUT_ARRAY_NESTED_ARRAY_HPP