ndnboost: Include boost::iostreams for internal use.
diff --git a/include/ndnboost/random/linear_congruential.hpp b/include/ndnboost/random/linear_congruential.hpp
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+/* boost random/linear_congruential.hpp header file
+ *
+ * Copyright Jens Maurer 2000-2001
+ * 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: linear_congruential.hpp 71018 2011-04-05 21:27:52Z steven_watanabe $
+ *
+ * Revision history
+ * 2001-02-18 moved to individual header files
+ */
+
+#ifndef NDNBOOST_RANDOM_LINEAR_CONGRUENTIAL_HPP
+#define NDNBOOST_RANDOM_LINEAR_CONGRUENTIAL_HPP
+
+#include <iostream>
+#include <stdexcept>
+#include <ndnboost/assert.hpp>
+#include <ndnboost/config.hpp>
+#include <ndnboost/cstdint.hpp>
+#include <ndnboost/limits.hpp>
+#include <ndnboost/static_assert.hpp>
+#include <ndnboost/integer/static_log2.hpp>
+#include <ndnboost/mpl/if.hpp>
+#include <ndnboost/type_traits/is_arithmetic.hpp>
+#include <ndnboost/random/detail/config.hpp>
+#include <ndnboost/random/detail/const_mod.hpp>
+#include <ndnboost/random/detail/seed.hpp>
+#include <ndnboost/random/detail/seed_impl.hpp>
+#include <ndnboost/detail/workaround.hpp>
+
+#include <ndnboost/random/detail/disable_warnings.hpp>
+
+namespace ndnboost {
+namespace random {
+
+/**
+ * Instantiations of class template linear_congruential_engine model a
+ * \pseudo_random_number_generator. Linear congruential pseudo-random
+ * number generators are described in:
+ *
+ * @blockquote
+ * "Mathematical methods in large-scale computing units", D. H. Lehmer,
+ * Proc. 2nd Symposium on Large-Scale Digital Calculating Machines,
+ * Harvard University Press, 1951, pp. 141-146
+ * @endblockquote
+ *
+ * Let x(n) denote the sequence of numbers returned by some pseudo-random
+ * number generator. Then for the linear congruential generator,
+ * x(n+1) := (a * x(n) + c) mod m. Parameters for the generator are
+ * x(0), a, c, m. The template parameter IntType shall denote an integral
+ * type. It must be large enough to hold values a, c, and m. The template
+ * parameters a and c must be smaller than m.
+ *
+ * Note: The quality of the generator crucially depends on the choice of
+ * the parameters. User code should use one of the sensibly parameterized
+ * generators such as minstd_rand instead.
+ */
+template<class IntType, IntType a, IntType c, IntType m>
+class linear_congruential_engine
+{
+public:
+ typedef IntType result_type;
+
+ // Required for old Boost.Random concept
+ NDNBOOST_STATIC_CONSTANT(bool, has_fixed_range = false);
+
+ NDNBOOST_STATIC_CONSTANT(IntType, multiplier = a);
+ NDNBOOST_STATIC_CONSTANT(IntType, increment = c);
+ NDNBOOST_STATIC_CONSTANT(IntType, modulus = m);
+ NDNBOOST_STATIC_CONSTANT(IntType, default_seed = 1);
+
+ NDNBOOST_STATIC_ASSERT(std::numeric_limits<IntType>::is_integer);
+ NDNBOOST_STATIC_ASSERT(m == 0 || a < m);
+ NDNBOOST_STATIC_ASSERT(m == 0 || c < m);
+
+ /**
+ * Constructs a @c linear_congruential_engine, using the default seed
+ */
+ linear_congruential_engine() { seed(); }
+
+ /**
+ * Constructs a @c linear_congruential_engine, seeding it with @c x0.
+ */
+ NDNBOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(linear_congruential_engine,
+ IntType, x0)
+ { seed(x0); }
+
+ /**
+ * Constructs a @c linear_congruential_engine, seeding it with values
+ * produced by a call to @c seq.generate().
+ */
+ NDNBOOST_RANDOM_DETAIL_SEED_SEQ_CONSTRUCTOR(linear_congruential_engine,
+ SeedSeq, seq)
+ { seed(seq); }
+
+ /**
+ * Constructs a @c linear_congruential_engine and seeds it
+ * with values taken from the itrator range [first, last)
+ * and adjusts first to point to the element after the last one
+ * used. If there are not enough elements, throws @c std::invalid_argument.
+ *
+ * first and last must be input iterators.
+ */
+ template<class It>
+ linear_congruential_engine(It& first, It last)
+ {
+ seed(first, last);
+ }
+
+ // compiler-generated copy constructor and assignment operator are fine
+
+ /**
+ * Calls seed(default_seed)
+ */
+ void seed() { seed(default_seed); }
+
+ /**
+ * If c mod m is zero and x0 mod m is zero, changes the current value of
+ * the generator to 1. Otherwise, changes it to x0 mod m. If c is zero,
+ * distinct seeds in the range [1,m) will leave the generator in distinct
+ * states. If c is not zero, the range is [0,m).
+ */
+ NDNBOOST_RANDOM_DETAIL_ARITHMETIC_SEED(linear_congruential_engine, IntType, x0)
+ {
+ // wrap _x if it doesn't fit in the destination
+ if(modulus == 0) {
+ _x = x0;
+ } else {
+ _x = x0 % modulus;
+ }
+ // handle negative seeds
+ if(_x <= 0 && _x != 0) {
+ _x += modulus;
+ }
+ // adjust to the correct range
+ if(increment == 0 && _x == 0) {
+ _x = 1;
+ }
+ NDNBOOST_ASSERT(_x >= (min)());
+ NDNBOOST_ASSERT(_x <= (max)());
+ }
+
+ /**
+ * Seeds a @c linear_congruential_engine using values from a SeedSeq.
+ */
+ NDNBOOST_RANDOM_DETAIL_SEED_SEQ_SEED(linear_congruential_engine, SeedSeq, seq)
+ { seed(detail::seed_one_int<IntType, m>(seq)); }
+
+ /**
+ * seeds a @c linear_congruential_engine with values taken
+ * from the itrator range [first, last) and adjusts @c first to
+ * point to the element after the last one used. If there are
+ * not enough elements, throws @c std::invalid_argument.
+ *
+ * @c first and @c last must be input iterators.
+ */
+ template<class It>
+ void seed(It& first, It last)
+ { seed(detail::get_one_int<IntType, m>(first, last)); }
+
+ /**
+ * Returns the smallest value that the @c linear_congruential_engine
+ * can produce.
+ */
+ static result_type min NDNBOOST_PREVENT_MACRO_SUBSTITUTION ()
+ { return c == 0 ? 1 : 0; }
+ /**
+ * Returns the largest value that the @c linear_congruential_engine
+ * can produce.
+ */
+ static result_type max NDNBOOST_PREVENT_MACRO_SUBSTITUTION ()
+ { return modulus-1; }
+
+ /** Returns the next value of the @c linear_congruential_engine. */
+ IntType operator()()
+ {
+ _x = const_mod<IntType, m>::mult_add(a, _x, c);
+ return _x;
+ }
+
+ /** 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(ndnboost::uintmax_t z)
+ {
+ typedef const_mod<IntType, m> mod_type;
+ IntType b_inv = mod_type::invert(a-1);
+ IntType b_gcd = mod_type::mult(a-1, b_inv);
+ if(b_gcd == 1) {
+ IntType a_z = mod_type::pow(a, z);
+ _x = mod_type::mult_add(a_z, _x,
+ mod_type::mult(mod_type::mult(c, b_inv), a_z - 1));
+ } else {
+ // compute (a^z - 1)*c % (b_gcd * m) / (b / b_gcd) * inv(b / b_gcd)
+ // we're storing the intermediate result / b_gcd
+ IntType a_zm1_over_gcd = 0;
+ IntType a_km1_over_gcd = (a - 1) / b_gcd;
+ ndnboost::uintmax_t exponent = z;
+ while(exponent != 0) {
+ if(exponent % 2 == 1) {
+ a_zm1_over_gcd =
+ mod_type::mult_add(
+ b_gcd,
+ mod_type::mult(a_zm1_over_gcd, a_km1_over_gcd),
+ mod_type::add(a_zm1_over_gcd, a_km1_over_gcd));
+ }
+ a_km1_over_gcd = mod_type::mult_add(
+ b_gcd,
+ mod_type::mult(a_km1_over_gcd, a_km1_over_gcd),
+ mod_type::add(a_km1_over_gcd, a_km1_over_gcd));
+ exponent /= 2;
+ }
+
+ IntType a_z = mod_type::mult_add(b_gcd, a_zm1_over_gcd, 1);
+ IntType num = mod_type::mult(c, a_zm1_over_gcd);
+ b_inv = mod_type::invert((a-1)/b_gcd);
+ _x = mod_type::mult_add(a_z, _x, mod_type::mult(b_inv, num));
+ }
+ }
+
+ friend bool operator==(const linear_congruential_engine& x,
+ const linear_congruential_engine& y)
+ { return x._x == y._x; }
+ friend bool operator!=(const linear_congruential_engine& x,
+ const linear_congruential_engine& y)
+ { return !(x == y); }
+
+#if !defined(NDNBOOST_RANDOM_NO_STREAM_OPERATORS)
+ /** Writes a @c linear_congruential_engine to a @c std::ostream. */
+ template<class CharT, class Traits>
+ friend std::basic_ostream<CharT,Traits>&
+ operator<<(std::basic_ostream<CharT,Traits>& os,
+ const linear_congruential_engine& lcg)
+ {
+ return os << lcg._x;
+ }
+
+ /** Reads a @c linear_congruential_engine from a @c std::istream. */
+ template<class CharT, class Traits>
+ friend std::basic_istream<CharT,Traits>&
+ operator>>(std::basic_istream<CharT,Traits>& is,
+ linear_congruential_engine& lcg)
+ {
+ lcg.read(is);
+ return is;
+ }
+#endif
+
+private:
+
+ /// \cond show_private
+
+ template<class CharT, class Traits>
+ void read(std::basic_istream<CharT, Traits>& is) {
+ IntType x;
+ if(is >> x) {
+ if(x >= (min)() && x <= (max)()) {
+ _x = x;
+ } else {
+ is.setstate(std::ios_base::failbit);
+ }
+ }
+ }
+
+ /// \endcond
+
+ IntType _x;
+};
+
+#ifndef NDNBOOST_NO_INCLASS_MEMBER_INITIALIZATION
+// A definition is required even for integral static constants
+template<class IntType, IntType a, IntType c, IntType m>
+const bool linear_congruential_engine<IntType, a, c, m>::has_fixed_range;
+template<class IntType, IntType a, IntType c, IntType m>
+const IntType linear_congruential_engine<IntType,a,c,m>::multiplier;
+template<class IntType, IntType a, IntType c, IntType m>
+const IntType linear_congruential_engine<IntType,a,c,m>::increment;
+template<class IntType, IntType a, IntType c, IntType m>
+const IntType linear_congruential_engine<IntType,a,c,m>::modulus;
+template<class IntType, IntType a, IntType c, IntType m>
+const IntType linear_congruential_engine<IntType,a,c,m>::default_seed;
+#endif
+
+/// \cond show_deprecated
+
+// provided for backwards compatibility
+template<class IntType, IntType a, IntType c, IntType m, IntType val = 0>
+class linear_congruential : public linear_congruential_engine<IntType, a, c, m>
+{
+ typedef linear_congruential_engine<IntType, a, c, m> base_type;
+public:
+ linear_congruential(IntType x0 = 1) : base_type(x0) {}
+ template<class It>
+ linear_congruential(It& first, It last) : base_type(first, last) {}
+};
+
+/// \endcond
+
+/**
+ * The specialization \minstd_rand0 was originally suggested in
+ *
+ * @blockquote
+ * A pseudo-random number generator for the System/360, P.A. Lewis,
+ * A.S. Goodman, J.M. Miller, IBM Systems Journal, Vol. 8, No. 2,
+ * 1969, pp. 136-146
+ * @endblockquote
+ *
+ * It is examined more closely together with \minstd_rand in
+ *
+ * @blockquote
+ * "Random Number Generators: Good ones are hard to find",
+ * Stephen K. Park and Keith W. Miller, Communications of
+ * the ACM, Vol. 31, No. 10, October 1988, pp. 1192-1201
+ * @endblockquote
+ */
+typedef linear_congruential_engine<uint32_t, 16807, 0, 2147483647> minstd_rand0;
+
+/** The specialization \minstd_rand was suggested in
+ *
+ * @blockquote
+ * "Random Number Generators: Good ones are hard to find",
+ * Stephen K. Park and Keith W. Miller, Communications of
+ * the ACM, Vol. 31, No. 10, October 1988, pp. 1192-1201
+ * @endblockquote
+ */
+typedef linear_congruential_engine<uint32_t, 48271, 0, 2147483647> minstd_rand;
+
+
+#if !defined(NDNBOOST_NO_INT64_T) && !defined(NDNBOOST_NO_INTEGRAL_INT64_T)
+/**
+ * Class @c rand48 models a \pseudo_random_number_generator. It uses
+ * the linear congruential algorithm with the parameters a = 0x5DEECE66D,
+ * c = 0xB, m = 2**48. It delivers identical results to the @c lrand48()
+ * function available on some systems (assuming lcong48 has not been called).
+ *
+ * It is only available on systems where @c uint64_t is provided as an
+ * integral type, so that for example static in-class constants and/or
+ * enum definitions with large @c uint64_t numbers work.
+ */
+class rand48
+{
+public:
+ typedef ndnboost::uint32_t result_type;
+
+ NDNBOOST_STATIC_CONSTANT(bool, has_fixed_range = false);
+ /**
+ * Returns the smallest value that the generator can produce
+ */
+ static uint32_t min NDNBOOST_PREVENT_MACRO_SUBSTITUTION () { return 0; }
+ /**
+ * Returns the largest value that the generator can produce
+ */
+ static uint32_t max NDNBOOST_PREVENT_MACRO_SUBSTITUTION ()
+ { return 0x7FFFFFFF; }
+
+ /** Seeds the generator with the default seed. */
+ rand48() : lcf(cnv(static_cast<uint32_t>(1))) {}
+ /**
+ * Constructs a \rand48 generator with x(0) := (x0 << 16) | 0x330e.
+ */
+ NDNBOOST_RANDOM_DETAIL_ARITHMETIC_CONSTRUCTOR(rand48, result_type, x0)
+ { seed(x0); }
+ /**
+ * Seeds the generator with values produced by @c seq.generate().
+ */
+ NDNBOOST_RANDOM_DETAIL_SEED_SEQ_CONSTRUCTOR(rand48, SeedSeq, seq)
+ { seed(seq); }
+ /**
+ * Seeds the generator using values from an iterator range,
+ * and updates first to point one past the last value consumed.
+ */
+ template<class It> rand48(It& first, It last) : lcf(first, last) { }
+
+ // compiler-generated copy ctor and assignment operator are fine
+
+ /** Seeds the generator with the default seed. */
+ void seed() { seed(static_cast<uint32_t>(1)); }
+ /**
+ * Changes the current value x(n) of the generator to (x0 << 16) | 0x330e.
+ */
+ NDNBOOST_RANDOM_DETAIL_ARITHMETIC_SEED(rand48, result_type, x0)
+ { lcf.seed(cnv(x0)); }
+ /**
+ * Seeds the generator using values from an iterator range,
+ * and updates first to point one past the last value consumed.
+ */
+ template<class It> void seed(It& first, It last) { lcf.seed(first,last); }
+ /**
+ * Seeds the generator with values produced by @c seq.generate().
+ */
+ NDNBOOST_RANDOM_DETAIL_SEED_SEQ_SEED(rand48, SeedSeq, seq)
+ { lcf.seed(seq); }
+
+ /** Returns the next value of the generator. */
+ uint32_t operator()() { return static_cast<uint32_t>(lcf() >> 17); }
+
+ /** Advances the state of the generator by @c z. */
+ void discard(ndnboost::uintmax_t z) { lcf.discard(z); }
+
+ /** Fills a range with random values */
+ template<class Iter>
+ void generate(Iter first, Iter last)
+ {
+ for(; first != last; ++first) {
+ *first = (*this)();
+ }
+ }
+
+#ifndef NDNBOOST_RANDOM_NO_STREAM_OPERATORS
+ /** Writes a @c rand48 to a @c std::ostream. */
+ template<class CharT,class Traits>
+ friend std::basic_ostream<CharT,Traits>&
+ operator<<(std::basic_ostream<CharT,Traits>& os, const rand48& r)
+ { os << r.lcf; return os; }
+
+ /** Reads a @c rand48 from a @c std::istream. */
+ template<class CharT,class Traits>
+ friend std::basic_istream<CharT,Traits>&
+ operator>>(std::basic_istream<CharT,Traits>& is, rand48& r)
+ { is >> r.lcf; return is; }
+#endif
+
+ /**
+ * Returns true if the two generators will produce identical
+ * sequences of values.
+ */
+ friend bool operator==(const rand48& x, const rand48& y)
+ { return x.lcf == y.lcf; }
+ /**
+ * Returns true if the two generators will produce different
+ * sequences of values.
+ */
+ friend bool operator!=(const rand48& x, const rand48& y)
+ { return !(x == y); }
+private:
+ /// \cond show_private
+ typedef random::linear_congruential_engine<uint64_t,
+ // xxxxULL is not portable
+ uint64_t(0xDEECE66DUL) | (uint64_t(0x5) << 32),
+ 0xB, uint64_t(1)<<48> lcf_t;
+ lcf_t lcf;
+
+ static ndnboost::uint64_t cnv(ndnboost::uint32_t x)
+ { return (static_cast<uint64_t>(x) << 16) | 0x330e; }
+ /// \endcond
+};
+#endif /* !NDNBOOST_NO_INT64_T && !NDNBOOST_NO_INTEGRAL_INT64_T */
+
+} // namespace random
+
+using random::minstd_rand0;
+using random::minstd_rand;
+using random::rand48;
+
+} // namespace ndnboost
+
+#include <ndnboost/random/detail/enable_warnings.hpp>
+
+#endif // NDNBOOST_RANDOM_LINEAR_CONGRUENTIAL_HPP