diff --git a/sprout/adapt/sscrisk/cel/array.hpp b/sprout/adapt/sscrisk/cel/array.hpp
index 199dc515..74d3c34c 100644
--- a/sprout/adapt/sscrisk/cel/array.hpp
+++ b/sprout/adapt/sscrisk/cel/array.hpp
@@ -2,9 +2,15 @@
 #define SPROUT_ADAPT_SSCRISK_CEL_ARRAY_HPP
 
 #include <cstddef>
+#include <type_traits>
 #include <sscrisk/cel/array.hpp>
 #include <sprout/config.hpp>
 #include <sprout/fixed_container/traits.hpp>
+#if SPROUT_USE_INDEX_ITERATOR_IMPLEMENTATION
+#	include <sprout/fixed_container/begin.hpp>
+#	include <sprout/fixed_container/end.hpp>
+#	include <sprout/iterator/index_iterator.hpp>
+#endif
 
 namespace sprout {
 	//
@@ -19,6 +25,85 @@ namespace sprout {
 				typedef sscrisk::cel::array<T, S> type;
 		};
 	};
+
+#if SPROUT_USE_INDEX_ITERATOR_IMPLEMENTATION
+	//
+	// fixed_container_traits
+	//
+	template<typename T, std::size_t N>
+	struct fixed_container_traits<sscrisk::cel::array<T, N> >
+		: public sprout::detail::fixed_container_traits_base<sscrisk::cel::array<T, N> >
+	{
+	public:
+		typedef sscrisk::cel::array<T, N> fixed_container_type;
+		typedef fixed_container_type internal_type;
+		typedef internal_type clone_type;
+		typedef sprout::index_iterator<fixed_container_type&> iterator;
+		typedef sprout::index_iterator<fixed_container_type const&> const_iterator;
+	public:
+		SPROUT_STATIC_CONSTEXPR typename sprout::detail::fixed_container_traits_base<fixed_container_type>::size_type fixed_size
+			= std::tuple_size<typename std::remove_const<internal_type>::type>::value
+			;
+	};
+	//
+	// fixed_container_traits
+	//
+	template<typename T, std::size_t N>
+	struct fixed_container_traits<sscrisk::cel::array<T, N> const>
+		: public sprout::detail::fixed_container_traits_base<sscrisk::cel::array<T, N> const>
+	{
+	public:
+		typedef sscrisk::cel::array<T, N> const fixed_container_type;
+		typedef typename std::remove_const<fixed_container_type>::type internal_type;
+		typedef internal_type clone_type;
+		typedef sprout::index_iterator<fixed_container_type&> iterator;
+		typedef sprout::index_iterator<fixed_container_type const&> const_iterator;
+	public:
+		SPROUT_STATIC_CONSTEXPR typename sprout::detail::fixed_container_traits_base<fixed_container_type>::size_type fixed_size
+			= std::tuple_size<typename std::remove_const<internal_type>::type>::value
+			;
+	};
+
+	//
+	// begin
+	//
+	template<typename T, std::size_t N>
+	typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::iterator begin(sscrisk::cel::array<T, N>& range) {
+		return typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::iterator(range, 0);
+	}
+	template<typename T, std::size_t N>
+	SPROUT_CONSTEXPR typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator begin(sscrisk::cel::array<T, N> const& range) {
+		return typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator(range, 0);
+	}
+
+	//
+	// cbegin
+	//
+	template<typename T, std::size_t N>
+	SPROUT_CONSTEXPR typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator cbegin(sscrisk::cel::array<T, N> const& range) {
+		return sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator(range, 0);
+	}
+
+	//
+	// end
+	//
+	template<typename T, std::size_t N>
+	typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::iterator end(sscrisk::cel::array<T, N>& range) {
+		return typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::iterator(range, range.size());
+	}
+	template<typename T, std::size_t N>
+	SPROUT_CONSTEXPR typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator end(sscrisk::cel::array<T, N> const& range) {
+		return typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator(range, range.size());
+	}
+
+	//
+	// cend
+	//
+	template<typename T, std::size_t N>
+	SPROUT_CONSTEXPR typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator cend(sscrisk::cel::array<T, N> const& range) {
+		return typename sprout::fixed_container_traits<sscrisk::cel::array<T, N> >::const_iterator(range, range.size());
+	}
+#endif
 }	// namespace sprout
 
 #endif	// #ifndef SPROUT_ADAPT_SSCRISK_CEL_ARRAY_HPP
diff --git a/sprout/random.hpp b/sprout/random.hpp
index 8e18490f..4e2a1375 100644
--- a/sprout/random.hpp
+++ b/sprout/random.hpp
@@ -9,10 +9,9 @@
 #include <sprout/random/uniform_01.hpp>
 #include <sprout/random/uniform_real_distribution.hpp>
 #include <sprout/random/bernoulli_distribution.hpp>
+#include <sprout/random/binomial_distribution.hpp>
 #include <sprout/random/variate_generator.hpp>
 #include <sprout/random/random_result.hpp>
 #include <sprout/random/random_iterator.hpp>
 
 #endif // #ifndef SPROUT_RANDOM_HPP
-
-
diff --git a/sprout/random/binomial_distribution.hpp b/sprout/random/binomial_distribution.hpp
new file mode 100644
index 00000000..009d4d28
--- /dev/null
+++ b/sprout/random/binomial_distribution.hpp
@@ -0,0 +1,425 @@
+#ifndef SPROUT_RANDOM_BINOMIAL_DISTRIBUTION_HPP
+#define SPROUT_RANDOM_BINOMIAL_DISTRIBUTION_HPP
+
+#include <iosfwd>
+#include <istream>
+#include <sprout/config.hpp>
+#include <sprout/array.hpp>
+#include <sprout/random/random_result.hpp>
+#include <sprout/random/uniform_01.hpp>
+
+namespace sprout {
+	namespace random {
+		namespace detail {
+			template<typename RealType>
+			struct binomial_table {
+				public:
+				SPROUT_STATIC_CONSTEXPR sprout::array<RealType, 10> table = sprout::array<RealType, 10>{{
+					0.08106146679532726,
+					0.04134069595540929,
+					0.02767792568499834,
+					0.02079067210376509,
+					0.01664469118982119,
+					0.01387612882307075,
+					0.01189670994589177,
+					0.01041126526197209,
+					0.009255462182712733,
+					0.008330563433362871
+				}};
+			};
+			template<class RealType>
+			SPROUT_CONSTEXPR sprout::array<RealType, 10> sprout::random::detail::binomial_table<RealType>::table;
+		}	// namespace detail
+		//
+		// binomial_distribution
+		//
+		template<typename IntType = int, typename RealType = double>
+		class binomial_distribution {
+		public:
+			typedef RealType input_type;
+			typedef IntType result_type;
+		private:
+			struct btrd_type {
+			public:
+				RealType r;
+				RealType nr;
+				RealType npq;
+				RealType b;
+				RealType a;
+				RealType c;
+				RealType alpha;
+				RealType v_r;
+				RealType u_rv_r;
+			};
+		private:
+			static SPROUT_CONSTEXPR IntType arg_check(IntType t_arg, RealType p_arg) {
+				return t_arg >= IntType(0) && RealType(0) <= p_arg && p_arg <= RealType(1)
+					? t_arg
+					: throw "assert(t_arg >= IntType(0) && RealType(0) <= p_arg && p_arg <= RealType(1))"
+					;
+			}
+		public:
+			//
+			// param_type
+			//
+			class param_type {
+			public:
+				typedef binomial_distribution distribution_type;
+			private:
+				IntType t_;
+				RealType p_;
+			public:
+				SPROUT_CONSTEXPR param_type()
+					: t_(1)
+					, p_(0.5)
+				{}
+				SPROUT_CONSTEXPR explicit param_type(IntType t_arg, RealType p_arg = RealType(0.5))
+					: t_(arg_check(t_arg, p_arg))
+					, p_(p_arg)
+				{}
+				SPROUT_CONSTEXPR IntType t() const {
+					return t_;
+				}
+				SPROUT_CONSTEXPR RealType p() const {
+					return p_;
+				}
+				template<typename Elem, typename Traits>
+				friend std::basic_ostream<Elem, Traits>& operator>>(
+					std::basic_istream<Elem, Traits>& lhs,
+					param_type const& rhs
+					)
+				{
+					return lhs >> rhs.t_ >> std::ws >> rhs.p_;
+				}
+				template<typename Elem, typename Traits>
+				friend std::basic_ostream<Elem, Traits>& operator<<(
+					std::basic_ostream<Elem, Traits>& lhs,
+					param_type const& rhs
+					)
+				{
+					return lhs << rhs.t_ << " " << rhs.p_;
+				}
+				SPROUT_CONSTEXPR friend bool operator==(param_type const& lhs, param_type const& rhs) {
+					return lhs.t_ == rhs.t_ && lhs.p_ == rhs.p_;
+				}
+				SPROUT_CONSTEXPR friend bool operator!=(param_type const& lhs, param_type const& rhs) {
+					return !(lhs == rhs);
+				}
+			};
+		private:
+			static SPROUT_CONSTEXPR IntType init_t(IntType t) {
+				return t;
+			}
+			static SPROUT_CONSTEXPR RealType init_p(RealType p) {
+				return RealType(0.5) < p ? 1 - p : p;
+			}
+			static SPROUT_CONSTEXPR IntType init_m(IntType t, RealType p) {
+				return static_cast<IntType>((init_t(t) + 1) * init_p(p));
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd_6(IntType t, RealType p, RealType r, RealType nr, RealType npq, RealType b, RealType a, RealType c, RealType alpha, RealType v_r) {
+				return btrd_type {
+					r,
+					nr,
+					npq,
+					b,
+					a,
+					c,
+					alpha,
+					v_r,
+					RealType(0.86) * v_r
+				};
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd_5(IntType t, RealType p, RealType r, RealType nr, RealType npq, RealType sqrt_npq, RealType b) {
+				return init_btrd_6(t, p, r, nr, npq, b, RealType(-0.0873) + RealType(0.0248) * b + RealType(0.01) * p, t * p + RealType(0.5), (RealType(2.83) + RealType(5.1) / b) * sqrt_npq, RealType(0.92) - RealType(4.2) / b);
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd_4(IntType t, RealType p, RealType r, RealType nr, RealType npq, RealType sqrt_npq) {
+				return init_btrd_5(t, p, r, nr, npq, sqrt_npq, RealType(1.15) + RealType(2.53) * sqrt_npq);
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd_3(IntType t, RealType p, RealType r, RealType nr, RealType npq) {
+				using std::sqrt;
+				return init_btrd_4(t, p, r, nr, npq, sqrt(npq));
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd_2(IntType t, RealType p, RealType r) {
+				return init_btrd_3(t, p, r, (t + 1) * r, t * p * (1 - p));
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd_1(IntType t, RealType p) {
+				return init_btrd_2(t, p, p / (1 - p));
+			}
+			static SPROUT_CONSTEXPR btrd_type init_btrd(IntType t, RealType p) {
+				return init_btrd_1(init_t(t), init_p(p));
+			}
+			static SPROUT_CONSTEXPR RealType init_q_n(IntType t, RealType p) {
+				using std::pow;
+				return pow(1 - init_p(p), static_cast<RealType>(init_t(t)));
+			}
+			static SPROUT_CONSTEXPR bool init_use_inversion(IntType t, RealType p) {
+				return init_m(t, p) < 11;
+			}
+			static SPROUT_CONSTEXPR RealType fc_1(RealType ikp1) {
+				return (RealType(1) / 12 - (RealType(1) / 360 - (RealType(1) / 1260) * (ikp1 * ikp1)) * (ikp1 * ikp1)) * ikp1;
+			}
+			static SPROUT_CONSTEXPR RealType fc(IntType k) {
+				return k < 10
+					? sprout::random::detail::binomial_table<RealType>::table[k]
+					: fc_1(RealType(1) / (k + 1))
+					;
+			}
+		private:
+			IntType t_;
+			RealType p_;
+			IntType m_;
+			btrd_type btrd_;
+			RealType q_n_;
+		private:
+			SPROUT_CONSTEXPR bool use_inversion() const {
+				return m_ < 11;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert_4(Engine const& eng, RealType u, RealType q, RealType s, RealType a, RealType r, IntType x = 0) const {
+				return u > r
+					? invert_4(eng, u - r, q, s, a, ((a / (x + 1)) - s) * r, x + 1)
+					: sprout::random::random_result<Engine, binomial_distribution>(x, eng, *this)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert_3(IntType t, Engine const& eng, RealType u, RealType q, RealType s) const {
+				return invert_4(eng, u, q, s, (t + 1) * s, q_n_);
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert_2(IntType t, RealType p, Engine const& eng, RealType u, RealType q) const {
+				return invert_3(t, eng, u, q, p / q);
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert_1(IntType t, RealType p, Engine const& eng, RealType u) const {
+				return invert_2(t, p, eng, u, 1 - p);
+			}
+			template<typename Engine, typename Random>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert_0(IntType t, RealType p, Random const& rnd) const {
+				return invert_1(t, p, rnd.engine(), rnd.result());
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert(IntType t, RealType p, Engine const& eng) const {
+				return invert_0<Engine>(t, p, sprout::random::uniform_01<RealType>()(eng));
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert2_0(IntType t, sprout::random::random_result<Engine, binomial_distribution> const& rnd) const {
+				return sprout::random::random_result<Engine, binomial_distribution>(t - rnd.result(), rnd.engine(), rnd.distribution());
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> invert2(IntType t, RealType p, Engine const& eng) const {
+				return invert2_0<Engine>(t, invert(t, p, eng));
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_10(Engine const& eng, RealType v, IntType k, IntType nm, RealType h, IntType nk) const {
+				using std::log;
+				return v <= h + (t_ + 1) * log(static_cast<RealType>(nm) / nk) + (k + RealType(0.5)) * log(nk * btrd_.r / (k + 1))- fc(k)- fc(t_ - k)
+					? sprout::random::random_result<Engine, binomial_distribution>(k, eng, *this)
+					: generate(eng)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_9(Engine const& eng, RealType v, IntType k, IntType nm) const {
+				using std::log;
+				return generate_10(eng, v, k, nm, (m_ + RealType(0.5)) * log((m_ + 1) / (btrd_.r * nm)) + fc(m_) + fc(t_ - m_), t_ - k + 1);
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_8(Engine const& eng, RealType v, IntType k, RealType rho, RealType t) const {
+				return v < t - rho ? sprout::random::random_result<Engine, binomial_distribution>(k, eng, *this)
+					: v > t + rho ? generate(eng)
+					: generate_9(eng, v, k, t_ - m_ + 1)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_7_3(Engine const& eng, RealType v, IntType k, RealType f) const {
+				return v <= f
+					? sprout::random::random_result<Engine, binomial_distribution>(k, eng, *this)
+					: generate(eng)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_7_2(Engine const& eng, RealType v, IntType k, RealType f, IntType i) const {
+				return i != k
+					? generate_7_2(eng, v * (btrd_.nr / (i + 1) - btrd_.r), k, f, i + 1)
+					: generate_7_3(eng, v, k, f)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_7_1(Engine const& eng, RealType v, IntType k, RealType f, IntType i) const {
+				return i != k
+					? generate_7_1(eng, v, k, f * (btrd_.nr / (i + 1) - btrd_.r), i + 1)
+					: generate_7_3(eng, v, k, f)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_7(Engine const& eng, RealType v, IntType k, RealType f = RealType(1)) const {
+				return m_ < k ? generate_7_1(eng, v, k, f * (btrd_.nr / (m_ + 1) - btrd_.r), m_ + 1)
+					: m_ > k ? generate_7_2(eng, v * (btrd_.nr / (k + 1) - btrd_.r), k, f, k + 1)
+					: generate_7_3(eng, v, k, f)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_6(Engine const& eng, RealType v, IntType k, RealType km) const {
+				using std::log;
+				return km <= 15
+					? generate_7(eng, v, k)
+					: generate_8(eng, log(v), k, (km / btrd_.npq) * (((km / RealType(3.0) + RealType(0.625)) * km + RealType(1.0) / 6) / btrd_.npq + RealType(0.5)), -km * km / (2 * btrd_.npq))
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_5(Engine const& eng, RealType v, RealType u, RealType us, IntType k) const {
+				using std::abs;
+				return k < 0 || k > t_
+					? generate(eng)
+					: generate_6(eng, v * btrd_.alpha / (btrd_.a / (us * us) + btrd_.b), k, abs(k - m_))
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_4(Engine const& eng, RealType v, RealType u, RealType us) const {
+				using std::floor;
+				return generate_5(eng, v, u, us, static_cast<IntType>(floor((2 * btrd_.a / us + btrd_.b) * u + btrd_.c)));
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_3(Engine const& eng, RealType v, RealType u) const {
+				using std::abs;
+				return generate_4(eng, v, u, 0.5 - abs(u));
+			}
+			template<typename Engine, typename Random>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_2(Random const& rnd, RealType v) const {
+				return v >= btrd_.v_r
+					? generate_3(
+						rnd.engine(),
+						v,
+						rnd.result() - RealType(0.5)
+						)
+					: generate_3(
+						rnd.engine(),
+						rnd.result() * btrd_.v_r,
+						((v / btrd_.v_r - RealType(0.93)) < 0 ? RealType(-0.5) : RealType(0.5)) - (v / btrd_.v_r - RealType(0.93))
+						)
+					;
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_1_1(Engine const& eng, RealType u) const {
+				using std::floor;
+				using std::abs;
+				return sprout::random::random_result<Engine, binomial_distribution>(
+					static_cast<IntType>(floor((2 * btrd_.a / (RealType(0.5) - abs(u)) + btrd_.b) * u + btrd_.c)),
+					eng,
+					*this
+					);
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_1(Engine const& eng, RealType v) const {
+				return v <= btrd_.u_rv_r
+					? generate_1_1(eng, v / btrd_.v_r - RealType(0.43))
+					: generate_2<Engine>(sprout::random::uniform_01<RealType>()(eng), v)
+					;
+			}
+			template<typename Engine, typename Random>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate_0(Random const& rnd) const {
+				return generate_1(rnd.engine(), rnd.result());
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate(Engine const& eng) const {
+				return generate_0<Engine>(sprout::random::uniform_01<RealType>()(eng));
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate2_0(IntType t, sprout::random::random_result<Engine, binomial_distribution> const& rnd) const {
+				return sprout::random::random_result<Engine, binomial_distribution>(t - rnd.result(), rnd.engine(), rnd.distribution());
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> generate2(IntType t, Engine const& eng) const {
+				return generate2_0<Engine>(t, generate(eng));
+			}
+			void init() {
+				m_ = init_m(t_, p_);
+				if (use_inversion()) {
+					q_n_ = init_q_n(t_, p_);
+				} else {
+					btrd_ = init_btrd(t_, p_);
+				}
+			}
+		public:
+			SPROUT_CONSTEXPR binomial_distribution()
+				: t_(1)
+				, p_(RealType(0.5))
+				, m_(init_m(1, RealType(0.5)))
+				, btrd_(!init_use_inversion(1, RealType(0.5)) ? init_btrd(1, RealType(0.5)) : btrd_type())
+				, q_n_(init_use_inversion(1, RealType(0.5)) ? init_q_n(1, RealType(0.5)) : RealType())
+			{}
+			SPROUT_CONSTEXPR explicit binomial_distribution(IntType t_arg, RealType p_arg = RealType(0.5))
+				: t_(arg_check(t_arg, p_arg))
+				, p_(p_arg)
+				, m_(init_m(t_arg, p_arg))
+				, btrd_(!init_use_inversion(t_arg, p_arg) ? init_btrd(t_arg, p_arg) : btrd_type())
+				, q_n_(init_use_inversion(t_arg, p_arg) ? init_q_n(t_arg, p_arg) : RealType())
+			{}
+			SPROUT_CONSTEXPR explicit binomial_distribution(param_type const& parm)
+				: t_(parm.t())
+				, p_(parm.p())
+				, m_(init_m(parm.t(), parm.p()))
+				, btrd_(!init_use_inversion(parm.t(), parm.p()) ? init_btrd(parm.t(), parm.p()) : btrd_type())
+				, q_n_(init_use_inversion(parm.t(), parm.p()) ? init_q_n(parm.t(), parm.p()) : RealType())
+			{}
+			SPROUT_CONSTEXPR result_type t() const {
+				return t_;
+			}
+			SPROUT_CONSTEXPR result_type p() const {
+				return p_;
+			}
+			SPROUT_CONSTEXPR result_type min() const {
+				return 0;
+			}
+			SPROUT_CONSTEXPR result_type max() const {
+				return t_;
+			}
+			SPROUT_CONSTEXPR param_type param() const {
+				return param_type(t_, p_);
+			}
+			void param(param_type const& parm) {
+				t_ = parm.a();
+				p_ = parm.b();
+				init();
+			}
+			template<typename Engine>
+			SPROUT_CONSTEXPR sprout::random::random_result<Engine, binomial_distribution> operator()(Engine const& eng) const {
+				return use_inversion() ? RealType(0.5) < p_
+						? invert2(t_, 1 - p_, eng)
+						: invert(t_, p_, eng)
+					: RealType(0.5) < p_ ? generate2(t_, eng)
+					: generate(eng)
+					;
+			}
+			template<typename Elem, typename Traits>
+			friend std::basic_ostream<Elem, Traits>& operator>>(
+				std::basic_istream<Elem, Traits>& lhs,
+				binomial_distribution const& rhs
+				)
+			{
+				param_type parm;
+				return lhs >> parm;
+				param(parm);
+				return lhs;
+			}
+			template<typename Elem, typename Traits>
+			friend std::basic_ostream<Elem, Traits>& operator<<(
+				std::basic_ostream<Elem, Traits>& lhs,
+				binomial_distribution const& rhs
+				)
+			{
+				return lhs << param();
+			}
+			SPROUT_CONSTEXPR friend bool operator==(binomial_distribution const& lhs, binomial_distribution const& rhs) {
+				return lhs.param() == rhs.param();
+			}
+			SPROUT_CONSTEXPR friend bool operator!=(binomial_distribution const& lhs, binomial_distribution const& rhs) {
+				return !(lhs == rhs);
+			}
+		};
+	}	// namespace random
+
+	using sprout::random::binomial_distribution;
+}	// namespace sprout
+
+#endif // #ifndef SPROUT_RANDOM_BINOMIAL_DISTRIBUTION_HPP
+