From f461643582b348120f7b1353721169e45947c0e3 Mon Sep 17 00:00:00 2001
From: bolero-MURAKAMI <bolero.murakami@gmail.com>
Date: Mon, 22 Apr 2013 14:51:38 +0900
Subject: [PATCH] tuple support: random_result

---
 sprout/index_tuple/integer_range.hpp |  2 +-
 sprout/random/random_result.hpp      | 96 ++++++++++++++++++++++++++++
 sprout/tuple/sscrisk/cel/utility.hpp |  1 -
 sprout/tuple/std/utility.hpp         |  1 -
 4 files changed, 97 insertions(+), 3 deletions(-)

diff --git a/sprout/index_tuple/integer_range.hpp b/sprout/index_tuple/integer_range.hpp
index 3e6aaddc..42fcb34c 100644
--- a/sprout/index_tuple/integer_range.hpp
+++ b/sprout/index_tuple/integer_range.hpp
@@ -26,7 +26,7 @@ namespace sprout {
 		struct integer_range_next_odd;
 		template<typename T, T... Is, T Next, T Tail>
 		struct integer_range_next_odd<T, sprout::integer_seq<T, Is...>, Next, Tail>
-			 : public sprout::integer_seq<T, Is..., (Is + Next)..., Tail>
+			: public sprout::integer_seq<T, Is..., (Is + Next)..., Tail>
 		{};
 
 		template<typename T, T First, typename std::make_signed<T>::type Step, typename std::make_unsigned<T>::type N, typename Enable = void>
diff --git a/sprout/random/random_result.hpp b/sprout/random/random_result.hpp
index e18d351a..49d0e184 100644
--- a/sprout/random/random_result.hpp
+++ b/sprout/random/random_result.hpp
@@ -7,8 +7,10 @@
 #include <type_traits>
 #include <sprout/config.hpp>
 #include <sprout/iterator/next.hpp>
+#include <sprout/tuple/tuple.hpp>
 #include <sprout/generator.hpp>
 #include <sprout/utility/swap.hpp>
+#include <sprout/utility/move.hpp>
 
 namespace sprout {
 	namespace random {
@@ -288,6 +290,100 @@ namespace sprout {
 	}	// namespace random
 
 	using sprout::random::random_result;
+
+	namespace tuples {
+		namespace detail {
+			template<std::size_t I, typename T>
+			struct tuple_element_impl;
+			template<typename Engine, typename Distribution>
+			struct tuple_element_impl<0, sprout::random::random_result<Engine, Distribution> > {
+			public:
+				typedef typename sprout::random::random_result<Engine, Distribution>::result_type type;
+			};
+			template<typename Engine, typename Distribution>
+			struct tuple_element_impl<1, sprout::random::random_result<Engine, Distribution> > {
+			public:
+				typedef sprout::random::random_result<Engine, Distribution> type;
+			};
+
+			template<std::size_t I, typename T>
+			struct get_impl;
+			template<typename Engine, typename Distribution>
+			struct get_impl<0, sprout::random::random_result<Engine, Distribution> > {
+			public:
+				SPROUT_CONSTEXPR typename sprout::random::random_result<Engine, Distribution>::result_type&
+				operator()(sprout::random::random_result<Engine, Distribution>& t) const {
+					return t.generated_value();
+				}
+				SPROUT_CONSTEXPR typename sprout::random::random_result<Engine, Distribution>::result_type const&
+				operator()(sprout::random::random_result<Engine, Distribution> const& t) const {
+					return t.generated_value();
+				}
+			};
+			template<typename Engine, typename Distribution>
+			struct get_impl<1, sprout::random::random_result<Engine, Distribution> > {
+			public:
+				SPROUT_CONSTEXPR sprout::random::random_result<Engine, Distribution>&
+				operator()(sprout::random::random_result<Engine, Distribution>& t) const {
+					return t.next_generator();
+				}
+				SPROUT_CONSTEXPR sprout::random::random_result<Engine, Distribution> const&
+				operator()(sprout::random::random_result<Engine, Distribution> const& t) const {
+					return t.next_generator();
+				}
+			};
+		}	// namespace detail
+	}	// namespace tuples
+}	// namespace sprout
+
+namespace std {
+#if defined(__clang__)
+#	pragma clang diagnostic push
+#	pragma clang diagnostic ignored "-Wmismatched-tags"
+#endif
+	//
+	// tuple_size
+	//
+	template<typename Engine, typename Distribution>
+	struct tuple_size<sprout::random::random_result<Engine, Distribution> >
+		: public std::integral_constant<std::size_t, 2>
+	{};
+
+	//
+	// tuple_element
+	//
+	template<std::size_t I, typename Engine, typename Distribution>
+	struct tuple_element<I, sprout::random::random_result<Engine, Distribution> >
+		: public sprout::tuples::detail::tuple_element_impl<I, sprout::random::random_result<Engine, Distribution> >
+	{};
+#if defined(__clang__)
+#	pragma clang diagnostic pop
+#endif
+}	// namespace std
+
+namespace sprout {
+	namespace random {
+		//
+		// tuple_get
+		//
+		template<std::size_t I, typename Engine, typename Distribution>
+		inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::random::random_result<Engine, Distribution> >::type&
+		tuple_get(sprout::random::random_result<Engine, Distribution>& t) SPROUT_NOEXCEPT {
+			static_assert(I < 2, "tuple_get: index out of range");
+			return sprout::tuples::detail::get_impl<I, sprout::random::random_result<Engine, Distribution> >()(t);
+		}
+		template<std::size_t I, typename Engine, typename Distribution>
+		inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::random::random_result<Engine, Distribution> >::type const&
+		tuple_get(sprout::random::random_result<Engine, Distribution> const& t) SPROUT_NOEXCEPT {
+			static_assert(I < 2, "tuple_get: index out of range");
+			return sprout::tuples::detail::get_impl<I, sprout::random::random_result<Engine, Distribution> >()(t);
+		}
+		template<std::size_t I, typename Engine, typename Distribution>
+		inline SPROUT_CONSTEXPR typename sprout::tuples::tuple_element<I, sprout::random::random_result<Engine, Distribution> >::type&&
+		tuple_get(sprout::random::random_result<Engine, Distribution>&& t) SPROUT_NOEXCEPT {
+			return sprout::move(sprout::tuples::get<I>(t));
+		}
+	}	// namespace random
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_RANDOM_RANDOM_RESULT_HPP
diff --git a/sprout/tuple/sscrisk/cel/utility.hpp b/sprout/tuple/sscrisk/cel/utility.hpp
index c8fe1897..89ec97e2 100644
--- a/sprout/tuple/sscrisk/cel/utility.hpp
+++ b/sprout/tuple/sscrisk/cel/utility.hpp
@@ -55,7 +55,6 @@ namespace sprout {
 			};
 			template<typename T1, typename T2>
 			struct get_impl<1, sscrisk::cel::pair<T1, T2> > {
-			public:
 			public:
 				SPROUT_CONSTEXPR T2& operator()(sscrisk::cel::pair<T1, T2>& t) const {
 					return t.second;
diff --git a/sprout/tuple/std/utility.hpp b/sprout/tuple/std/utility.hpp
index d2a94678..c25fbc21 100644
--- a/sprout/tuple/std/utility.hpp
+++ b/sprout/tuple/std/utility.hpp
@@ -25,7 +25,6 @@ namespace sprout {
 			};
 			template<typename T1, typename T2>
 			struct get_impl<1, std::pair<T1, T2> > {
-			public:
 			public:
 				SPROUT_CONSTEXPR T2& operator()(std::pair<T1, T2>& t) const {
 					return t.second;