| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP___RANDOM_SHUFFLE_ORDER_ENGINE_H |
| #define _LIBCPP___RANDOM_SHUFFLE_ORDER_ENGINE_H |
| |
| #include <__algorithm/equal.h> |
| #include <__config> |
| #include <__random/is_seed_sequence.h> |
| #include <__utility/move.h> |
| #include <cstdint> |
| #include <iosfwd> |
| #include <type_traits> |
| |
| #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| # pragma GCC system_header |
| #endif |
| |
| _LIBCPP_PUSH_MACROS |
| #include <__undef_macros> |
| |
| _LIBCPP_BEGIN_NAMESPACE_STD |
| |
| template <uint64_t _Xp, uint64_t _Yp> |
| struct __ugcd |
| { |
| static _LIBCPP_CONSTEXPR const uint64_t value = __ugcd<_Yp, _Xp % _Yp>::value; |
| }; |
| |
| template <uint64_t _Xp> |
| struct __ugcd<_Xp, 0> |
| { |
| static _LIBCPP_CONSTEXPR const uint64_t value = _Xp; |
| }; |
| |
| template <uint64_t _Np, uint64_t _Dp> |
| class __uratio |
| { |
| static_assert(_Dp != 0, "__uratio divide by 0"); |
| static _LIBCPP_CONSTEXPR const uint64_t __gcd = __ugcd<_Np, _Dp>::value; |
| public: |
| static _LIBCPP_CONSTEXPR const uint64_t num = _Np / __gcd; |
| static _LIBCPP_CONSTEXPR const uint64_t den = _Dp / __gcd; |
| |
| typedef __uratio<num, den> type; |
| }; |
| |
| template<class _Engine, size_t __k> |
| class _LIBCPP_TEMPLATE_VIS shuffle_order_engine |
| { |
| static_assert(0 < __k, "shuffle_order_engine invalid parameters"); |
| public: |
| // types |
| typedef typename _Engine::result_type result_type; |
| |
| private: |
| _Engine __e_; |
| result_type __v_[__k]; |
| result_type __y_; |
| |
| public: |
| // engine characteristics |
| static _LIBCPP_CONSTEXPR const size_t table_size = __k; |
| |
| #ifdef _LIBCPP_CXX03_LANG |
| static const result_type _Min = _Engine::_Min; |
| static const result_type _Max = _Engine::_Max; |
| #else |
| static _LIBCPP_CONSTEXPR const result_type _Min = _Engine::min(); |
| static _LIBCPP_CONSTEXPR const result_type _Max = _Engine::max(); |
| #endif |
| static_assert(_Min < _Max, "shuffle_order_engine invalid parameters"); |
| _LIBCPP_INLINE_VISIBILITY |
| static _LIBCPP_CONSTEXPR result_type min() { return _Min; } |
| _LIBCPP_INLINE_VISIBILITY |
| static _LIBCPP_CONSTEXPR result_type max() { return _Max; } |
| |
| static _LIBCPP_CONSTEXPR const unsigned long long _Rp = _Max - _Min + 1ull; |
| |
| // constructors and seeding functions |
| _LIBCPP_INLINE_VISIBILITY |
| shuffle_order_engine() {__init();} |
| _LIBCPP_INLINE_VISIBILITY |
| explicit shuffle_order_engine(const _Engine& __e) |
| : __e_(__e) {__init();} |
| #ifndef _LIBCPP_CXX03_LANG |
| _LIBCPP_INLINE_VISIBILITY |
| explicit shuffle_order_engine(_Engine&& __e) |
| : __e_(_VSTD::move(__e)) {__init();} |
| #endif // _LIBCPP_CXX03_LANG |
| _LIBCPP_INLINE_VISIBILITY |
| explicit shuffle_order_engine(result_type __sd) : __e_(__sd) {__init();} |
| template<class _Sseq> |
| _LIBCPP_INLINE_VISIBILITY |
| explicit shuffle_order_engine(_Sseq& __q, |
| typename enable_if<__is_seed_sequence<_Sseq, shuffle_order_engine>::value && |
| !is_convertible<_Sseq, _Engine>::value>::type* = 0) |
| : __e_(__q) {__init();} |
| _LIBCPP_INLINE_VISIBILITY |
| void seed() {__e_.seed(); __init();} |
| _LIBCPP_INLINE_VISIBILITY |
| void seed(result_type __sd) {__e_.seed(__sd); __init();} |
| template<class _Sseq> |
| _LIBCPP_INLINE_VISIBILITY |
| typename enable_if |
| < |
| __is_seed_sequence<_Sseq, shuffle_order_engine>::value, |
| void |
| >::type |
| seed(_Sseq& __q) {__e_.seed(__q); __init();} |
| |
| // generating functions |
| _LIBCPP_INLINE_VISIBILITY |
| result_type operator()() {return __eval(integral_constant<bool, _Rp != 0>());} |
| _LIBCPP_INLINE_VISIBILITY |
| void discard(unsigned long long __z) {for (; __z; --__z) operator()();} |
| |
| // property functions |
| _LIBCPP_INLINE_VISIBILITY |
| const _Engine& base() const _NOEXCEPT {return __e_;} |
| |
| private: |
| template<class _Eng, size_t _Kp> |
| friend |
| bool |
| operator==( |
| const shuffle_order_engine<_Eng, _Kp>& __x, |
| const shuffle_order_engine<_Eng, _Kp>& __y); |
| |
| template<class _Eng, size_t _Kp> |
| friend |
| bool |
| operator!=( |
| const shuffle_order_engine<_Eng, _Kp>& __x, |
| const shuffle_order_engine<_Eng, _Kp>& __y); |
| |
| template <class _CharT, class _Traits, |
| class _Eng, size_t _Kp> |
| friend |
| basic_ostream<_CharT, _Traits>& |
| operator<<(basic_ostream<_CharT, _Traits>& __os, |
| const shuffle_order_engine<_Eng, _Kp>& __x); |
| |
| template <class _CharT, class _Traits, |
| class _Eng, size_t _Kp> |
| friend |
| basic_istream<_CharT, _Traits>& |
| operator>>(basic_istream<_CharT, _Traits>& __is, |
| shuffle_order_engine<_Eng, _Kp>& __x); |
| |
| _LIBCPP_INLINE_VISIBILITY |
| void __init() |
| { |
| for (size_t __i = 0; __i < __k; ++__i) |
| __v_[__i] = __e_(); |
| __y_ = __e_(); |
| } |
| |
| _LIBCPP_INLINE_VISIBILITY |
| result_type __eval(false_type) {return __eval2(integral_constant<bool, __k & 1>());} |
| _LIBCPP_INLINE_VISIBILITY |
| result_type __eval(true_type) {return __eval(__uratio<__k, _Rp>());} |
| |
| _LIBCPP_INLINE_VISIBILITY |
| result_type __eval2(false_type) {return __eval(__uratio<__k/2, 0x8000000000000000ull>());} |
| _LIBCPP_INLINE_VISIBILITY |
| result_type __eval2(true_type) {return __evalf<__k, 0>();} |
| |
| template <uint64_t _Np, uint64_t _Dp> |
| _LIBCPP_INLINE_VISIBILITY |
| typename enable_if |
| < |
| (__uratio<_Np, _Dp>::num > 0xFFFFFFFFFFFFFFFFull / (_Max - _Min)), |
| result_type |
| >::type |
| __eval(__uratio<_Np, _Dp>) |
| {return __evalf<__uratio<_Np, _Dp>::num, __uratio<_Np, _Dp>::den>();} |
| |
| template <uint64_t _Np, uint64_t _Dp> |
| _LIBCPP_INLINE_VISIBILITY |
| typename enable_if |
| < |
| __uratio<_Np, _Dp>::num <= 0xFFFFFFFFFFFFFFFFull / (_Max - _Min), |
| result_type |
| >::type |
| __eval(__uratio<_Np, _Dp>) |
| { |
| const size_t __j = static_cast<size_t>(__uratio<_Np, _Dp>::num * (__y_ - _Min) |
| / __uratio<_Np, _Dp>::den); |
| __y_ = __v_[__j]; |
| __v_[__j] = __e_(); |
| return __y_; |
| } |
| |
| template <uint64_t __n, uint64_t __d> |
| _LIBCPP_INLINE_VISIBILITY |
| result_type __evalf() |
| { |
| const double _Fp = __d == 0 ? |
| __n / (2. * 0x8000000000000000ull) : |
| __n / (double)__d; |
| const size_t __j = static_cast<size_t>(_Fp * (__y_ - _Min)); |
| __y_ = __v_[__j]; |
| __v_[__j] = __e_(); |
| return __y_; |
| } |
| }; |
| |
| template<class _Engine, size_t __k> |
| _LIBCPP_CONSTEXPR const size_t shuffle_order_engine<_Engine, __k>::table_size; |
| |
| template<class _Eng, size_t _Kp> |
| _LIBCPP_HIDE_FROM_ABI bool |
| operator==( |
| const shuffle_order_engine<_Eng, _Kp>& __x, |
| const shuffle_order_engine<_Eng, _Kp>& __y) |
| { |
| return __x.__y_ == __y.__y_ && _VSTD::equal(__x.__v_, __x.__v_ + _Kp, __y.__v_) && |
| __x.__e_ == __y.__e_; |
| } |
| |
| template<class _Eng, size_t _Kp> |
| inline _LIBCPP_INLINE_VISIBILITY |
| bool |
| operator!=( |
| const shuffle_order_engine<_Eng, _Kp>& __x, |
| const shuffle_order_engine<_Eng, _Kp>& __y) |
| { |
| return !(__x == __y); |
| } |
| |
| template <class _CharT, class _Traits, |
| class _Eng, size_t _Kp> |
| _LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>& |
| operator<<(basic_ostream<_CharT, _Traits>& __os, |
| const shuffle_order_engine<_Eng, _Kp>& __x) |
| { |
| __save_flags<_CharT, _Traits> __lx(__os); |
| typedef basic_ostream<_CharT, _Traits> _Ostream; |
| __os.flags(_Ostream::dec | _Ostream::left); |
| _CharT __sp = __os.widen(' '); |
| __os.fill(__sp); |
| __os << __x.__e_ << __sp << __x.__v_[0]; |
| for (size_t __i = 1; __i < _Kp; ++__i) |
| __os << __sp << __x.__v_[__i]; |
| return __os << __sp << __x.__y_; |
| } |
| |
| template <class _CharT, class _Traits, |
| class _Eng, size_t _Kp> |
| _LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>& |
| operator>>(basic_istream<_CharT, _Traits>& __is, |
| shuffle_order_engine<_Eng, _Kp>& __x) |
| { |
| typedef typename shuffle_order_engine<_Eng, _Kp>::result_type result_type; |
| __save_flags<_CharT, _Traits> __lx(__is); |
| typedef basic_istream<_CharT, _Traits> _Istream; |
| __is.flags(_Istream::dec | _Istream::skipws); |
| _Eng __e; |
| result_type _Vp[_Kp+1]; |
| __is >> __e; |
| for (size_t __i = 0; __i < _Kp+1; ++__i) |
| __is >> _Vp[__i]; |
| if (!__is.fail()) |
| { |
| __x.__e_ = __e; |
| for (size_t __i = 0; __i < _Kp; ++__i) |
| __x.__v_[__i] = _Vp[__i]; |
| __x.__y_ = _Vp[_Kp]; |
| } |
| return __is; |
| } |
| |
| _LIBCPP_END_NAMESPACE_STD |
| |
| _LIBCPP_POP_MACROS |
| |
| #endif // _LIBCPP___RANDOM_SHUFFLE_ORDER_ENGINE_H |
