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Diffstat (limited to 'src/third_party/boost-1.56.0/boost/random/independent_bits.hpp')
| -rw-r--r-- | src/third_party/boost-1.56.0/boost/random/independent_bits.hpp | 260 |
1 files changed, 0 insertions, 260 deletions
diff --git a/src/third_party/boost-1.56.0/boost/random/independent_bits.hpp b/src/third_party/boost-1.56.0/boost/random/independent_bits.hpp deleted file mode 100644 index 5ff52b80ff9..00000000000 --- a/src/third_party/boost-1.56.0/boost/random/independent_bits.hpp +++ /dev/null @@ -1,260 +0,0 @@ -/* boost random/independent_bits.hpp header file - * - * Copyright Steven Watanabe 2011 - * 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) - * - * See http://www.boost.org for most recent version including documentation. - * - * $Id$ - * - */ - -#ifndef BOOST_RANDOM_INDEPENDENT_BITS_HPP -#define BOOST_RANDOM_INDEPENDENT_BITS_HPP - -#include <istream> -#include <iosfwd> -#include <boost/assert.hpp> -#include <boost/limits.hpp> -#include <boost/config.hpp> -#include <boost/cstdint.hpp> -#include <boost/integer/integer_mask.hpp> -#include <boost/type_traits/make_unsigned.hpp> -#include <boost/random/detail/config.hpp> -#include <boost/random/detail/integer_log2.hpp> -#include <boost/random/detail/operators.hpp> -#include <boost/random/detail/seed.hpp> -#include <boost/random/detail/seed_impl.hpp> -#include <boost/random/detail/signed_unsigned_tools.hpp> - -namespace boost { -namespace random { - -/** - * An instantiation of class template @c independent_bits_engine - * model a \pseudo_random_number_generator. It generates random - * numbers distributed between [0, 2^w) by combining one or - * more invocations of the base engine. - * - * Requires: 0 < w <= std::numeric_limits<UIntType>::digits - */ -template<class Engine, std::size_t w, class UIntType> -class independent_bits_engine -{ -public: - typedef Engine base_type; - typedef UIntType result_type; - - // Required by old Boost.Random concept - BOOST_STATIC_CONSTANT(bool, has_fixed_range = false); - - /** Returns the smallest value that the generator can produce. */ - static result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () - { return 0; } - /** Returns the largest value that the generator can produce. */ - static result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () - { return boost::low_bits_mask_t<w>::sig_bits; } - - /** - * Constructs an @c independent_bits_engine using the - * default constructor of the base generator. - */ - independent_bits_engine() { } - - /** - * Constructs an @c independent_bits_engine, using seed as - * the constructor argument for both base generators. - */ - BOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(independent_bits_engine, - result_type, seed_arg) - { - _base.seed(seed_arg); - } - - /** - * Constructs an @c independent_bits_engine, using seq as - * the constructor argument for the base generator. - */ - BOOST_RANDOM_DETAIL_SEED_SEQ_CONSTRUCTOR(independent_bits_engine, - SeedSeq, seq) - { _base.seed(seq); } - - /** Constructs an @c independent_bits_engine by copying @c base. */ - independent_bits_engine(const base_type& base_arg) : _base(base_arg) {} - - /** - * Contructs an @c independent_bits_engine with - * values from the range defined by the input iterators first - * and last. first will be modified to point to the element - * after the last one used. - * - * Throws: @c std::invalid_argument if the input range is too small. - * - * Exception Safety: Basic - */ - template<class It> - independent_bits_engine(It& first, It last) : _base(first, last) { } - - /** - * Seeds an @c independent_bits_engine using the default - * seed of the base generator. - */ - void seed() { _base.seed(); } - - /** - * Seeds an @c independent_bits_engine, using @c seed as the - * seed for the base generator. - */ - BOOST_RANDOM_DETAIL_ARITHMETIC_SEED(independent_bits_engine, - result_type, seed_arg) - { _base.seed(seed_arg); } - - /** - * Seeds an @c independent_bits_engine, using @c seq to - * seed the base generator. - */ - BOOST_RANDOM_DETAIL_SEED_SEQ_SEED(independent_bits_engine, - SeedSeq, seq) - { _base.seed(seq); } - - /** - * Seeds an @c independent_bits_engine with - * values from the range defined by the input iterators first - * and last. first will be modified to point to the element - * after the last one used. - * - * Throws: @c std::invalid_argument if the input range is too small. - * - * Exception Safety: Basic - */ - template<class It> void seed(It& first, It last) - { _base.seed(first, last); } - - /** Returns the next value of the generator. */ - result_type operator()() - { - // While it may seem wasteful to recalculate this - // every time, both msvc and gcc can propagate - // constants, resolving this at compile time. - base_unsigned range = - detail::subtract<base_result>()((_base.max)(), (_base.min)()); - std::size_t m = - (range == (std::numeric_limits<base_unsigned>::max)()) ? - std::numeric_limits<base_unsigned>::digits : - detail::integer_log2(range + 1); - std::size_t n = (w + m - 1) / m; - std::size_t w0, n0; - base_unsigned y0, y1; - base_unsigned y0_mask, y1_mask; - calc_params(n, range, w0, n0, y0, y1, y0_mask, y1_mask); - if(base_unsigned(range - y0 + 1) > y0 / n) { - // increment n and try again. - ++n; - calc_params(n, range, w0, n0, y0, y1, y0_mask, y1_mask); - } - - BOOST_ASSERT(n0*w0 + (n - n0)*(w0 + 1) == w); - - result_type S = 0; - for(std::size_t k = 0; k < n0; ++k) { - base_unsigned u; - do { - u = detail::subtract<base_result>()(_base(), (_base.min)()); - } while(u > base_unsigned(y0 - 1)); - S = (S << w0) + (u & y0_mask); - } - for(std::size_t k = 0; k < (n - n0); ++k) { - base_unsigned u; - do { - u = detail::subtract<base_result>()(_base(), (_base.min)()); - } while(u > base_unsigned(y1 - 1)); - S = (S << (w0 + 1)) + (u & y1_mask); - } - return S; - } - - /** Fills a range with random values */ - template<class Iter> - void generate(Iter first, Iter last) - { detail::generate_from_int(*this, first, last); } - - /** Advances the state of the generator by @c z. */ - void discard(boost::uintmax_t z) - { - for(boost::uintmax_t i = 0; i < z; ++i) { - (*this)(); - } - } - - const base_type& base() const { return _base; } - - /** - * Writes the textual representation if the generator to a @c std::ostream. - * The textual representation of the engine is the textual representation - * of the base engine. - */ - BOOST_RANDOM_DETAIL_OSTREAM_OPERATOR(os, independent_bits_engine, r) - { - os << r._base; - return os; - } - - /** - * Reads the state of an @c independent_bits_engine from a - * @c std::istream. - */ - BOOST_RANDOM_DETAIL_ISTREAM_OPERATOR(is, independent_bits_engine, r) - { - is >> r._base; - return is; - } - - /** - * Returns: true iff the two @c independent_bits_engines will - * produce the same sequence of values. - */ - BOOST_RANDOM_DETAIL_EQUALITY_OPERATOR(independent_bits_engine, x, y) - { return x._base == y._base; } - /** - * Returns: true iff the two @c independent_bits_engines will - * produce different sequences of values. - */ - BOOST_RANDOM_DETAIL_INEQUALITY_OPERATOR(independent_bits_engine) - -private: - - /// \cond show_private - typedef typename base_type::result_type base_result; - typedef typename make_unsigned<base_result>::type base_unsigned; - - void calc_params( - std::size_t n, base_unsigned range, - std::size_t& w0, std::size_t& n0, - base_unsigned& y0, base_unsigned& y1, - base_unsigned& y0_mask, base_unsigned& y1_mask) - { - BOOST_ASSERT(w >= n); - w0 = w/n; - n0 = n - w % n; - y0_mask = (base_unsigned(2) << (w0 - 1)) - 1; - y1_mask = (y0_mask << 1) | 1; - y0 = (range + 1) & ~y0_mask; - y1 = (range + 1) & ~y1_mask; - BOOST_ASSERT(y0 != 0 || base_unsigned(range + 1) == 0); - } - /// \endcond - - Engine _base; -}; - -#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION -template<class Engine, std::size_t w, class UIntType> -const bool independent_bits_engine<Engine, w, UIntType>::has_fixed_range; -#endif - -} // namespace random -} // namespace boost - -#endif // BOOST_RANDOM_INDEPENDENT_BITS_HPP |