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Sprout/sprout/random/shuffle_order.hpp
bolero-MURAKAMI fbb95d9068 add pointer_cast
2014-11-28 16:19:07 +09:00

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/*=============================================================================
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_RANDOM_SHUFFLE_ORDER_HPP
#define SPROUT_RANDOM_SHUFFLE_ORDER_HPP
#include <cstdint>
#include <istream>
#include <ostream>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/workaround/std/cstddef.hpp>
#include <sprout/limits.hpp>
#include <sprout/array/array.hpp>
#include <sprout/array/comparison.hpp>
#include <sprout/operation/fixed/set.hpp>
#include <sprout/math/compare.hpp>
#include <sprout/random/random_result.hpp>
#include <sprout/random/linear_congruential.hpp>
#include <sprout/random/detail/signed_unsigned_tools.hpp>
#include <sprout/random/type_traits.hpp>
#include <sprout/random/generate_array.hpp>
#include <sprout/random/results.hpp>
#include <sprout/type_traits/enabler_if.hpp>
#include <sprout/assert.hpp>
#include <sprout/workaround/recursive_function_template.hpp>
namespace sprout {
namespace random {
namespace detail {
template<typename UniformRandomNumberGenerator, std::size_t k>
class shuffle_order_engine_member {
protected:
typedef UniformRandomNumberGenerator base_type;
typedef typename base_type::result_type result_type;
public:
base_type rng_;
sprout::array<result_type, k> v_;
result_type y_;
public:
SPROUT_CXX14_CONSTEXPR shuffle_order_engine_member& operator=(shuffle_order_engine_member const& rhs) {
rng_ = rhs.rng_;
v_ = rhs.v_;
y_ = rhs.y_;
return *this;
}
};
} // namespace detail
//
// shuffle_order_engine
//
template<typename UniformRandomNumberGenerator, std::size_t k>
class shuffle_order_engine
: private sprout::random::detail::shuffle_order_engine_member<UniformRandomNumberGenerator, k>
{
static_assert(
sprout::numeric_limits<typename UniformRandomNumberGenerator::result_type>::is_integer,
"sprout::numeric_limits<typename UniformRandomNumberGenerator::result_type>::is_integer"
);
static_assert(k > 0, "k > 0");
private:
typedef sprout::random::detail::shuffle_order_engine_member<UniformRandomNumberGenerator, k> member_type;
public:
typedef UniformRandomNumberGenerator base_type;
typedef typename base_type::result_type result_type;
private:
struct private_construct_t {};
public:
SPROUT_STATIC_CONSTEXPR std::size_t buffer_size = k;
SPROUT_STATIC_CONSTEXPR std::size_t table_size = k;
public:
static SPROUT_CONSTEXPR result_type static_min() SPROUT_NOEXCEPT {
return base_type::static_min();
}
static SPROUT_CONSTEXPR result_type static_max() SPROUT_NOEXCEPT {
return base_type::static_max();
}
private:
template<std::size_t M, typename EngineResult, typename... Args, sprout::index_t... Indexes>
static SPROUT_CONSTEXPR typename std::enable_if<
(M + sizeof...(Args) == k),
member_type
>::type init_member_4(sprout::index_tuple<Indexes...>, sprout::array<result_type, M> const& a, EngineResult const& rnd, Args const&... args) {
return member_type{
sprout::random::next(rnd),
sprout::array<result_type, k>{{a[Indexes]..., args...}},
sprout::random::result(rnd)
};
}
template<std::size_t M, typename EngineResult, typename... Args>
static SPROUT_CONSTEXPR typename std::enable_if<
(M + sizeof...(Args) == k),
member_type
>::type init_member_3(sprout::array<result_type, M> const& a, EngineResult const& rnd, Args const&... args) {
return init_member_4(sprout::make_index_tuple<M>::make(), a, rnd, args...);
}
template<std::size_t M, typename EngineResult, typename... Args>
static SPROUT_CONSTEXPR typename std::enable_if<
(M + sizeof...(Args) < k),
member_type
>::type init_member_3(sprout::array<result_type, M> const& a, EngineResult const& rnd, Args const&... args) {
return init_member_3(a, sprout::random::next(rnd)(), args..., sprout::random::result(rnd));
}
template<typename Pair>
static SPROUT_CONSTEXPR member_type init_member_2(Pair const& p) {
return init_member_3(p.first, p.second());
}
template<typename EngineResult, typename... Args>
static SPROUT_CONSTEXPR typename std::enable_if<
(sizeof...(Args) == k),
member_type
>::type init_member_1(EngineResult const& rnd, Args const&... args) {
return member_type{
sprout::random::next(rnd),
sprout::array<result_type, k>{{args...}},
sprout::random::result(rnd)
};
}
template<typename EngineResult, typename... Args>
static SPROUT_CONSTEXPR typename std::enable_if<
(sizeof...(Args) < k),
member_type
>::type init_member_1(EngineResult const& rnd, Args const&... args) {
return init_member_1(sprout::random::next(rnd)(), args..., sprout::random::result(rnd));
}
static SPROUT_CONSTEXPR member_type init_member_0(base_type const& rng, std::true_type) {
return init_member_2(sprout::random::generate_array<k / 2>(rng));
}
static SPROUT_CONSTEXPR member_type init_member_0(base_type const& rng, std::false_type) {
return init_member_1(rng());
}
static SPROUT_CONSTEXPR member_type init_member(base_type const& rng) {
return init_member_0(rng, std::integral_constant<bool, (k >= SPROUT_RECURSIVE_FUNCTION_TEMPLATE_INSTANTIATION_LIMIT)>());
}
private:
using member_type::rng_;
using member_type::v_;
using member_type::y_;
private:
SPROUT_CONSTEXPR shuffle_order_engine(
base_type const& rng,
sprout::array<result_type, k> const& v,
result_type y,
private_construct_t
)
: member_type{rng, v, y}
{}
template<typename EngineResult, typename BaseUnsigned>
SPROUT_CONSTEXPR sprout::random::random_result<shuffle_order_engine>
generate_1(EngineResult const& rnd, BaseUnsigned j) const {
return sprout::random::random_result<shuffle_order_engine>(
v_[j],
shuffle_order_engine(
sprout::random::next(rnd),
sprout::fixed::set(v_, j, sprout::random::result(rnd)),
v_[j],
private_construct_t()
)
);
}
template<typename BaseUnsigned>
SPROUT_CONSTEXPR sprout::random::random_result<shuffle_order_engine>
generate(BaseUnsigned brange, BaseUnsigned off) const {
return generate_1(
rng_(),
k == 1 ? BaseUnsigned(0)
: sprout::math::less(brange, sprout::numeric_limits<BaseUnsigned>::max() / k) ? BaseUnsigned(k * off / (brange + 1))
: sprout::math::less(brange, sprout::numeric_limits<std::uintmax_t>::max() / k)
? static_cast<BaseUnsigned>(static_cast<std::uintmax_t>(off) * k / (static_cast<std::uintmax_t>(brange) + 1))
// : static_cast<BaseUnsigned>(sprout::random::detail::muldiv(off, k, static_cast<std::uintmax_t>(brange) + 1)) // ???
: (SPROUT_ASSERT_MSG(0, "Sorry, not implemented."), sprout::random::random_result<shuffle_order_engine>())
);
}
public:
SPROUT_CONSTEXPR shuffle_order_engine()
: member_type(init_member(base_type()))
{}
shuffle_order_engine(shuffle_order_engine const&) = default;
explicit SPROUT_CONSTEXPR shuffle_order_engine(result_type seed)
: member_type(init_member(base_type(seed)))
{}
template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
explicit SPROUT_CXX14_CONSTEXPR shuffle_order_engine(Sseq& seq)
: member_type(init_member(base_type(seq)))
{}
template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
explicit SPROUT_CONSTEXPR shuffle_order_engine(Sseq const& seq)
: member_type(init_member(base_type(seq)))
{}
template<typename InputIterator>
SPROUT_CONSTEXPR shuffle_order_engine(InputIterator first, InputIterator last)
: member_type(init_member(base_type(first, last)))
{}
explicit SPROUT_CONSTEXPR shuffle_order_engine(base_type const& rng)
: member_type(init_member(rng))
{}
SPROUT_CXX14_CONSTEXPR void seed() {
member_type::operator=(init_member(base_type()));
}
SPROUT_CXX14_CONSTEXPR void seed(result_type seed) {
member_type::operator=(init_member(base_type(seed)));
}
template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
SPROUT_CXX14_CONSTEXPR void seed(Sseq& seq) {
member_type::operator=(init_member(base_type(seq)));
}
template<typename Sseq, typename sprout::enabler_if<sprout::random::is_seed_seq<Sseq>::value>::type = sprout::enabler>
SPROUT_CXX14_CONSTEXPR void seed(Sseq const& seq) {
member_type::operator=(init_member(base_type(seq)));
}
template<typename InputIterator>
SPROUT_CXX14_CONSTEXPR void seed(InputIterator first, InputIterator last) {
member_type::operator=(init_member(base_type(first, last)));
}
SPROUT_CONSTEXPR result_type min() const SPROUT_NOEXCEPT {
return rng_.min();
}
SPROUT_CONSTEXPR result_type max() const SPROUT_NOEXCEPT {
return rng_.max();
}
SPROUT_CXX14_CONSTEXPR result_type operator()() {
typedef typename std::make_unsigned<result_type>::type base_unsigned;
base_unsigned const brange = sprout::random::detail::subtract<result_type>()(max(), min());
base_unsigned const off = sprout::random::detail::subtract<result_type>()(y_, min());
base_unsigned j = k == 1 ? base_unsigned(0)
: sprout::math::less(brange, sprout::numeric_limits<base_unsigned>::max() / k) ? base_unsigned(k * off / (brange + 1))
: sprout::math::less(brange, sprout::numeric_limits<std::uintmax_t>::max() / k)
? static_cast<base_unsigned>(static_cast<std::uintmax_t>(off) * k / (static_cast<std::uintmax_t>(brange) + 1))
// : static_cast<base_unsigned>(sprout::random::detail::muldiv(off, k, static_cast<std::uintmax_t>(brange) + 1)) // ???
: (SPROUT_ASSERT_MSG(0, "Sorry, not implemented."), base_unsigned(0))
;
y_ = v_[j];
v_[j] = static_cast<result_type>(rng_());
return y_;
}
SPROUT_CONSTEXPR sprout::random::random_result<shuffle_order_engine> const operator()() const {
typedef typename std::make_unsigned<result_type>::type base_unsigned;
return generate(
base_unsigned(sprout::random::detail::subtract<result_type>()(max(), min())),
base_unsigned(sprout::random::detail::subtract<result_type>()(y_, min()))
);
}
SPROUT_CONSTEXPR base_type const& base() const SPROUT_NOEXCEPT {
return rng_;
}
friend SPROUT_CONSTEXPR bool operator==(shuffle_order_engine const& lhs, shuffle_order_engine const& rhs) SPROUT_NOEXCEPT {
return lhs.rng_ == rhs.rng_ && lhs.y_ == rhs.y_ && lhs.v_ == rhs.v_;
}
friend SPROUT_CONSTEXPR bool operator!=(shuffle_order_engine const& lhs, shuffle_order_engine const& rhs) SPROUT_NOEXCEPT {
return !(lhs == rhs);
}
template<typename Elem, typename Traits>
friend SPROUT_NON_CONSTEXPR std::basic_istream<Elem, Traits>& operator>>(
std::basic_istream<Elem, Traits>& lhs,
shuffle_order_engine& rhs
)
{
lhs >> rhs.rng_;
for (std::size_t i = 0; i < k; ++i) {
lhs >> std::ws >> rhs.v_[i];
}
lhs >> std::ws >> rhs.y_;
return lhs;
}
template<typename Elem, typename Traits>
friend SPROUT_NON_CONSTEXPR std::basic_ostream<Elem, Traits>& operator<<(
std::basic_ostream<Elem, Traits>& lhs,
shuffle_order_engine const& rhs
)
{
lhs << rhs.rng_;
for (std::size_t i = 0; i < k; ++i) {
lhs << ' ' << rhs.v_[i];
}
lhs << ' ' << rhs.y_;
return lhs;
}
};
template<typename UniformRandomNumberGenerator, std::size_t k>
SPROUT_CONSTEXPR_OR_CONST std::size_t sprout::random::shuffle_order_engine<UniformRandomNumberGenerator, k>::buffer_size;
template<typename UniformRandomNumberGenerator, std::size_t k>
SPROUT_CONSTEXPR_OR_CONST std::size_t sprout::random::shuffle_order_engine<UniformRandomNumberGenerator, k>::table_size;
//
// knuth_b
// kreutzer1986
//
typedef sprout::random::shuffle_order_engine<sprout::random::minstd_rand0, 256> knuth_b;
typedef sprout::random::shuffle_order_engine<sprout::random::linear_congruential_engine<std::uint_fast32_t, 1366, 150889, 714025>, 97> kreutzer1986;
} // namespace random
using sprout::random::shuffle_order_engine;
using sprout::random::knuth_b;
using sprout::random::kreutzer1986;
} // namespace sprout
#endif // #ifndef SPROUT_RANDOM_SHUFFLE_ORDER_HPP
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