tests/algorithms/25.random.shuffle.cpp - stdcxx - Git at Google

 /***************************************************************************
  *
  * 25.random.shuffle.cpp - test exercising 25.2.11 [lib.alg.random.shuffle]
  *
  * $Id$
  *
  ***************************************************************************
  *
  * Licensed to the Apache Software  Foundation (ASF) under one or more
  * contributor  license agreements.  See  the NOTICE  file distributed
  * with  this  work  for  additional information  regarding  copyright
  * ownership.   The ASF  licenses this  file to  you under  the Apache
  * License, Version  2.0 (the  "License"); you may  not use  this file
  * except in  compliance with the License.   You may obtain  a copy of
  * the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the  License is distributed on an  "AS IS" BASIS,
  * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
  * implied.   See  the License  for  the  specific language  governing
  * permissions and limitations under the License.
  *
  * Copyright 1994-2006 Rogue Wave Software.
  *
  **************************************************************************/

 #include <algorithm>    // for random_shuffle
 #include <cstring>      // for memset(), size_t

 #include <alg_test.h>
 #include <rw_value.h>   // for UserClass
 #include <driver.h>     // for rw_test()


 _RWSTD_NAMESPACE (std) {

 // disable explicit instantiation for compilers (like MSVC)
 // that can't handle it
 #ifndef _RWSTD_NO_EXPLICIT_INSTANTIATION

 template
 void
 random_shuffle (RandomAccessIter<assign<base<cpy_ctor> > >,
                 RandomAccessIter<assign<base<cpy_ctor> > >);

 template
 void
 random_shuffle (RandomAccessIter<assign<base<cpy_ctor> > >,
                 RandomAccessIter<assign<base<cpy_ctor> > >,
                 func<const std::size_t >&);

 #endif // _RWSTD_NO_EXPLICIT_INSTANTIATION

 }   // namespace std

 /**************************************************************************/

 // 25.2.11, p3 requires that a RandomNumberGenerator take
 // and return a value convertible from and to, respectively,
 // iterator::difference_type

 template <class DifferenceType>
 struct Convertible
 {
     Convertible (DifferenceType val): val_ (val) { }
     operator DifferenceType () /* non-const */ { return val_; }

 private:
     const DifferenceType val_;

     template <class T>
     Convertible (T);
 };

 // detect assumptions made by the algorithm about the return value
 // from RandomGenerator::operator() being anything but convertible
 // to the iterator's difference type
 template <class DifferenceType, class T>
 void operator+ (Convertible<DifferenceType>, T);

 template <class DifferenceType, class T>
 void operator+ (T, Convertible<DifferenceType>);

 template <class DifferenceType>
 struct RandomGenerator
 {
     // dummy arguments to prevent the class from being default
     // constructible or construtible by conversion from an int
     RandomGenerator (int, int) {
         ncalls_ = 0;
     }

     // non-const in order to detect unwarranted assumptions
     // in the algorithm(s)
     Convertible<DifferenceType>
     operator() (DifferenceType n) /* non-const */ {

         ++ncalls_;

         gen_ = (gen_ << 7) + gen_ % 128;

         // prevent the number from going negative(!)
         if (gen_ < 0)
             gen_ = -gen_;

         return gen_ % n;
     }

     static std::size_t ncalls_;

 private:

     template <class T>
     void operator() (T) /* non-const */;

     static DifferenceType gen_;
 };

 template <class DifferenceType>
 std::size_t RandomGenerator<DifferenceType>::ncalls_ = 0;

 template <class DifferenceType>
 DifferenceType RandomGenerator<DifferenceType>::gen_ = 12345;

 /**************************************************************************/

 int sequence_start;

 int sequence_generator ()
 {
     return sequence_start++;
 }

 /**************************************************************************/

 // exercises 25.2.11 -- std::random_shuffle()
 template <class T, class Iterator, class RandomNumberGenerator>
 void test_random_shuffle (const std::size_t            line,
                           const std::size_t            N,
                           const Iterator              &it,
                           const RandomNumberGenerator*,
                           const T*,
                           bool                         rnd_gen)
 {
     const char* const itname  = type_name (it, (T*)0);
     const char* const fname   = "random_shuffle";
     const char* const funname = rnd_gen ? "random_generator" : "";

     rw_info (0, 0, 0,
              "std::%s (%s, %2$s%{?}, %s%{;})",
              fname, itname, rnd_gen, funname);

     // generate a sequential value for each default-constructed T
     // starting with 0 (i.e., T::val_ will be 0 for the first T)
     sequence_start = 0;
     T::gen_        = sequence_generator;

     T    *buf      = new T [N + 1];
     char *missing  = new char [N + 1];

     for (std::size_t i = 0; i < N; ++i) {

         // create a pair of safe iterator to pass to random_shuffle
         // in order to test that the function doesn't write past
         // the end of the sequence [first, last)
         const Iterator first = make_iter (buf,     buf, buf + i, it);
         const Iterator last  = make_iter (buf + i, buf, buf + i, it);

         /* non-const */ RandomNumberGenerator rnd (0, 0);   // dummy args

         // exercise 25.2.11 - std::random_shuffle<>()
         std::size_t n_op_assign = T::n_total_op_assign_;

         // shuffle buffer elements
         if (rnd_gen)
             std::random_shuffle (first, last, rnd);
         else
             std::random_shuffle (first, last);

         n_op_assign = T::n_total_op_assign_ - n_op_assign;

         // verify 25.2.11, p1
         // iterate over elements of the missing array clearing those
         // at the index given by T::val_ to true to verify that the
         // algorithm didn't drop any elements
         std::size_t j;
         std::memset (missing, 1, N);
         for (j = 0; j != i; ++j) {
             const std::size_t inx = std::size_t (buf [j].data_.val_);
             if (inx < N)
                 missing [inx] = 0;
         }

         // find the first missing element (if any)
         const char* const first_missing = (char*)std::memchr (missing, 1, i);

         bool success = 0 == first_missing;

         rw_assert (success, 0, line,
                    "%zu. std::%s<%s%{?}, %s%{;}>(): can't find element "
                    "with value %td: got \"%{X=*.*}\"",
                    i, fname, itname, rnd_gen, funname,
                    first_missing - missing,
                    int (i), -1, buf);


         // verify 25.2.11, p2, complexity:
         // exactly K = ((last - first) - 1) swaps
         // i.e., K * 2 assignments (at 2 assignment per swap
         // plus one copy construction)
         success = n_op_assign == 2 * (i ? i - 1 : i);
         rw_assert (success, 0, line,
                    "%zu. std::%s<%s%{?}, %s%{;}>(): complexity: "
                    "expected %zu swaps, got %zu",
                    i, fname, itname, rnd_gen, funname,
                    2 * i, n_op_assign);
     }

     delete[] buf;
     delete[] missing;
 }

 /**************************************************************************/

 void test_random_shuffle (const std::size_t line)
 {
 #ifndef _RWSTD_NO_EXT_PORTABLE_RANDOM_SEQUENCE

     rw_info (0, 0, 0,
              "verify that the randomly shuffled sequence "
              "matches the expected result, this "
              "depends on the implementation of the random "
              "number generator used by random_shuffle()");

     int array[] = {
         0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
         0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
         0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
         0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
         0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
         0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
         0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
         0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
         0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
         0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
         0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
         0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
         0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
         0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
         0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
         0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
         0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
         0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
         0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
         0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
         0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
         0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
         0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
         0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
         0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
         0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
         0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
         0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
         0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
     };

     std::random_shuffle (array, array + sizeof array / sizeof *array);

     const int result[] = {
         0xad, 0x19, 0xcf, 0xa7, 0x40, 0xbc, 0x66, 0x42,
         0xfb, 0xf4, 0xa6, 0x34, 0xce, 0xfe, 0xb9, 0xbe,
         0x48, 0xff, 0xc5, 0xcc, 0x2d, 0x08, 0xe3, 0x3e,
         0x29, 0xba, 0x1d, 0xb0, 0x6b, 0x07, 0x35, 0x1f,
         0x30, 0xc3, 0x32, 0xc1, 0x70, 0xac, 0x50, 0x33,
         0x5f, 0x49, 0x2f, 0x0f, 0x53, 0x05, 0xf0, 0xb6,
         0x9d, 0xd9, 0x0c, 0xe5, 0x63, 0xf7, 0x8e, 0xd7,
         0xb2, 0x13, 0x22, 0x69, 0x06, 0x02, 0xbf, 0x89,
         0x82, 0x8f, 0x6e, 0x6c, 0xb4, 0xc0, 0xc4, 0xf2,
         0x1b, 0x94, 0xfc, 0xe2, 0xd4, 0xf9, 0x0a, 0x5a,
         0x10, 0x09, 0xe7, 0x9a, 0x6d, 0xa9, 0x75, 0xcd,
         0x28, 0x2a, 0xae, 0x15, 0xbb, 0x62, 0x1e, 0xeb,
         0x26, 0x90, 0x7e, 0xa3, 0x7f, 0x59, 0xfd, 0xde,
         0x2b, 0x85, 0x74, 0x16, 0x45, 0x4c, 0xaa, 0x78,
         0xf3, 0x01, 0x9f, 0x5c, 0x8c, 0x71, 0x0e, 0xe4,
         0x86, 0xca, 0x11, 0x54, 0xa8, 0xd0, 0x1c, 0x96,
         0xdc, 0xd1, 0x3c, 0xf6, 0xe1, 0x9e, 0x41, 0xa5,
         0x27, 0x31, 0xa4, 0x4d, 0x57, 0x55, 0x7d, 0x0b,
         0xc7, 0xd3, 0x6f, 0x84, 0x61, 0x25, 0xb7, 0xdd,
         0x36, 0x58, 0x2e, 0xe6, 0x95, 0xa1, 0x39, 0x88,
         0xf5, 0xfa, 0x91, 0x60, 0x83, 0xab, 0x38, 0xe0,
         0xb5, 0x24, 0xed, 0x47, 0xea, 0x56, 0xa2, 0x68,
         0xf1, 0x77, 0x3d, 0x97, 0xc6, 0x21, 0x7a, 0xb8,
         0x14, 0x65, 0x3a, 0x43, 0x80, 0xdb, 0x52, 0x44,
         0x23, 0x12, 0x5b, 0x37, 0x17, 0xd6, 0xbd, 0xec,
         0x0d, 0xa0, 0x4f, 0xd5, 0x8a, 0x5e, 0x9b, 0x2c,
         0x4a, 0x5d, 0xef, 0x81, 0x79, 0x8d, 0x03, 0x64,
         0xdf, 0xb3, 0x04, 0x73, 0xaf, 0x87, 0xd8, 0x3b,
         0x7b, 0x46, 0xc9, 0x76, 0xe9, 0x51, 0x6a, 0xc2,
         0xd2, 0x1a, 0x7c, 0x4e, 0x93, 0x3f, 0x92, 0xc8,
         0x8b, 0xe8, 0x20, 0x72, 0x18, 0x99, 0xcb, 0x67,
            0, 0xb1, 0xf8, 0xda, 0x4b, 0x9c, 0x98, 0xee
     };

     bool success = true;
     std::size_t i = 0;
     for (; i != sizeof array / sizeof *array; ++i) {
         success = array [i] == result [i];
         if (!success)
             break;
     }

     rw_assert (success, 0, line,
                "randomly shuffled sequence failed to match "
                "the expected result (data portability failure) "
                "%d != %d at %zu",
                array [i], result [i], i + 1);

 #else
     rw_note (0, 0, 0,
              "_RWSTD_NO_EXT_PORTABLE_RANDOM_SEQUENCE is defined, "
              "no random_test available");
 #endif   // _RWSTD_NO_EXT_PORTABLE_RANDOM_SEQUENCE
 }

 /**************************************************************************/

 /* extern */ int rw_opt_nloops = 1024;          // --nloops=#
 /* extern */ int rw_opt_no_random;              // --no-random
 /* extern */ int rw_opt_no_random_generator;    // --no-random_generator
 /* extern */ int rw_opt_no_rand_test;           // --no-rand_test


 static int run_test (int, char*[])
 {
     const std::size_t N = std::size_t (rw_opt_nloops);

     typedef RandomAccessIter<UserClass>::difference_type DiffT;
     typedef RandomGenerator<DiffT>               RandGenT;

     if (rw_opt_no_random) {
         rw_note (0, __FILE__, __LINE__, "std::random test disabled");
     }
     else {
         rw_info (0, 0, 0,
                  "template <class %s> "
                  "std::random_shuffle (%1$s, %1$s)",
                  "RandomAccessIterator");

         test_random_shuffle (__LINE__, N, RandomAccessIter<UserClass>(),
                              (RandGenT*)0, (UserClass*)0, false);
     }

     if (rw_opt_no_rand_test) {
         rw_note (0, __FILE__, __LINE__, "random algorithm test disabled");
     }
     else {
         test_random_shuffle (__LINE__);
     }

     if (rw_opt_no_random_generator) {
         rw_note (0, __FILE__, __LINE__,
                  "std::random with random_generator test disabled");
     }
     else {
         rw_info (0, 0, 0,
                  "template <class %s, class %s> "
                  "std::random_shuffle (%1$s, %1$s, %2$s)",
                  "RandomAccessIterator", "RandomNumberGenerator");

         test_random_shuffle (__LINE__, N, RandomAccessIter<UserClass>(),
                              (RandGenT*)0, (UserClass*)0, true);
     }

     return 0;
 }

 /**************************************************************************/

 int main (int argc, char *argv[])
 {
     return rw_test (argc, argv, __FILE__,
                     "lib.alg.random_shuffle",
                     0 /* no comment */, run_test,
                     "|-nloops#0 "   // must be non-negative
                     "|-no-random# "
                     "|-no-random_generator# "
                     "|-no-rand_test",
                     &rw_opt_nloops,
                     &rw_opt_no_random,
                     &rw_opt_no_random_generator,
                     &rw_opt_no_rand_test);
 }
	/***************************************************************************
	*
	* 25.random.shuffle.cpp - test exercising 25.2.11 [lib.alg.random.shuffle]
	*
	* $Id$
	*
	***************************************************************************
	*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed
	* with this work for additional information regarding copyright
	* ownership. The ASF licenses this file to you under the Apache
	* License, Version 2.0 (the "License"); you may not use this file
	* except in compliance with the License. You may obtain a copy of
	* the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
	* implied. See the License for the specific language governing
	* permissions and limitations under the License.
	*
	* Copyright 1994-2006 Rogue Wave Software.
	*
	**************************************************************************/

	#include <algorithm> // for random_shuffle
	#include <cstring> // for memset(), size_t

	#include <alg_test.h>
	#include <rw_value.h> // for UserClass
	#include <driver.h> // for rw_test()


	_RWSTD_NAMESPACE (std) {

	// disable explicit instantiation for compilers (like MSVC)
	// that can't handle it
	#ifndef _RWSTD_NO_EXPLICIT_INSTANTIATION

	template
	void
	random_shuffle (RandomAccessIter<assign<base<cpy_ctor> > >,
	RandomAccessIter<assign<base<cpy_ctor> > >);

	template
	void
	random_shuffle (RandomAccessIter<assign<base<cpy_ctor> > >,
	RandomAccessIter<assign<base<cpy_ctor> > >,
	func<const std::size_t >&);

	#endif // _RWSTD_NO_EXPLICIT_INSTANTIATION

	} // namespace std

	/**************************************************************************/

	// 25.2.11, p3 requires that a RandomNumberGenerator take
	// and return a value convertible from and to, respectively,
	// iterator::difference_type

	template <class DifferenceType>
	struct Convertible
	{
	Convertible (DifferenceType val): val_ (val) { }
	operator DifferenceType () /* non-const */ { return val_; }

	private:
	const DifferenceType val_;

	template <class T>
	Convertible (T);
	};

	// detect assumptions made by the algorithm about the return value
	// from RandomGenerator::operator() being anything but convertible
	// to the iterator's difference type
	template <class DifferenceType, class T>
	void operator+ (Convertible<DifferenceType>, T);

	template <class DifferenceType, class T>
	void operator+ (T, Convertible<DifferenceType>);

	template <class DifferenceType>
	struct RandomGenerator
	{
	// dummy arguments to prevent the class from being default
	// constructible or construtible by conversion from an int
	RandomGenerator (int, int) {
	ncalls_ = 0;
	}

	// non-const in order to detect unwarranted assumptions
	// in the algorithm(s)
	Convertible<DifferenceType>
	operator() (DifferenceType n) /* non-const */ {

	++ncalls_;

	gen_ = (gen_ << 7) + gen_ % 128;

	// prevent the number from going negative(!)
	if (gen_ < 0)
	gen_ = -gen_;

	return gen_ % n;
	}

	static std::size_t ncalls_;

	private:

	template <class T>
	void operator() (T) /* non-const */;

	static DifferenceType gen_;
	};

	template <class DifferenceType>
	std::size_t RandomGenerator<DifferenceType>::ncalls_ = 0;

	template <class DifferenceType>
	DifferenceType RandomGenerator<DifferenceType>::gen_ = 12345;

	/**************************************************************************/

	int sequence_start;

	int sequence_generator ()
	{
	return sequence_start++;
	}

	/**************************************************************************/

	// exercises 25.2.11 -- std::random_shuffle()
	template <class T, class Iterator, class RandomNumberGenerator>
	void test_random_shuffle (const std::size_t line,
	const std::size_t N,
	const Iterator &it,
	const RandomNumberGenerator*,
	const T*,
	bool rnd_gen)
	{
	const char* const itname = type_name (it, (T*)0);
	const char* const fname = "random_shuffle";
	const char* const funname = rnd_gen ? "random_generator" : "";

	rw_info (0, 0, 0,
	"std::%s (%s, %2$s%{?}, %s%{;})",
	fname, itname, rnd_gen, funname);

	// generate a sequential value for each default-constructed T
	// starting with 0 (i.e., T::val_ will be 0 for the first T)
	sequence_start = 0;
	T::gen_ = sequence_generator;

	T *buf = new T [N + 1];
	char *missing = new char [N + 1];

	for (std::size_t i = 0; i < N; ++i) {

	// create a pair of safe iterator to pass to random_shuffle
	// in order to test that the function doesn't write past
	// the end of the sequence [first, last)
	const Iterator first = make_iter (buf, buf, buf + i, it);
	const Iterator last = make_iter (buf + i, buf, buf + i, it);

	/* non-const */ RandomNumberGenerator rnd (0, 0); // dummy args

	// exercise 25.2.11 - std::random_shuffle<>()
	std::size_t n_op_assign = T::n_total_op_assign_;

	// shuffle buffer elements
	if (rnd_gen)
	std::random_shuffle (first, last, rnd);
	else
	std::random_shuffle (first, last);

	n_op_assign = T::n_total_op_assign_ - n_op_assign;

	// verify 25.2.11, p1
	// iterate over elements of the missing array clearing those
	// at the index given by T::val_ to true to verify that the
	// algorithm didn't drop any elements
	std::size_t j;
	std::memset (missing, 1, N);
	for (j = 0; j != i; ++j) {
	const std::size_t inx = std::size_t (buf [j].data_.val_);
	if (inx < N)
	missing [inx] = 0;
	}

	// find the first missing element (if any)
	const char* const first_missing = (char*)std::memchr (missing, 1, i);

	bool success = 0 == first_missing;

	rw_assert (success, 0, line,
	"%zu. std::%s<%s%{?}, %s%{;}>(): can't find element "
	"with value %td: got \"%{X=.}\"",
	i, fname, itname, rnd_gen, funname,
	first_missing - missing,
	int (i), -1, buf);


	// verify 25.2.11, p2, complexity:
	// exactly K = ((last - first) - 1) swaps
	// i.e., K * 2 assignments (at 2 assignment per swap
	// plus one copy construction)
	success = n_op_assign == 2 * (i ? i - 1 : i);
	rw_assert (success, 0, line,
	"%zu. std::%s<%s%{?}, %s%{;}>(): complexity: "
	"expected %zu swaps, got %zu",
	i, fname, itname, rnd_gen, funname,
	2 * i, n_op_assign);
	}

	delete[] buf;
	delete[] missing;
	}

	/**************************************************************************/

	void test_random_shuffle (const std::size_t line)
	{
	#ifndef _RWSTD_NO_EXT_PORTABLE_RANDOM_SEQUENCE

	rw_info (0, 0, 0,
	"verify that the randomly shuffled sequence "
	"matches the expected result, this "
	"depends on the implementation of the random "
	"number generator used by random_shuffle()");

	int array[] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
	0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
	0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
	0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
	0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
	0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
	0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f,
	0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
	0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f,
	0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
	0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f,
	0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
	0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f,
	0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
	0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f,
	0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
	0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f,
	0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
	0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
	0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
	0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf,
	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7,
	0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf,
	0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
	0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf,
	0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7,
	0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf,
	0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7,
	0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef,
	0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7,
	0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff
	};

	std::random_shuffle (array, array + sizeof array / sizeof *array);

	const int result[] = {
	0xad, 0x19, 0xcf, 0xa7, 0x40, 0xbc, 0x66, 0x42,
	0xfb, 0xf4, 0xa6, 0x34, 0xce, 0xfe, 0xb9, 0xbe,
	0x48, 0xff, 0xc5, 0xcc, 0x2d, 0x08, 0xe3, 0x3e,
	0x29, 0xba, 0x1d, 0xb0, 0x6b, 0x07, 0x35, 0x1f,
	0x30, 0xc3, 0x32, 0xc1, 0x70, 0xac, 0x50, 0x33,
	0x5f, 0x49, 0x2f, 0x0f, 0x53, 0x05, 0xf0, 0xb6,
	0x9d, 0xd9, 0x0c, 0xe5, 0x63, 0xf7, 0x8e, 0xd7,
	0xb2, 0x13, 0x22, 0x69, 0x06, 0x02, 0xbf, 0x89,
	0x82, 0x8f, 0x6e, 0x6c, 0xb4, 0xc0, 0xc4, 0xf2,
	0x1b, 0x94, 0xfc, 0xe2, 0xd4, 0xf9, 0x0a, 0x5a,
	0x10, 0x09, 0xe7, 0x9a, 0x6d, 0xa9, 0x75, 0xcd,
	0x28, 0x2a, 0xae, 0x15, 0xbb, 0x62, 0x1e, 0xeb,
	0x26, 0x90, 0x7e, 0xa3, 0x7f, 0x59, 0xfd, 0xde,
	0x2b, 0x85, 0x74, 0x16, 0x45, 0x4c, 0xaa, 0x78,
	0xf3, 0x01, 0x9f, 0x5c, 0x8c, 0x71, 0x0e, 0xe4,
	0x86, 0xca, 0x11, 0x54, 0xa8, 0xd0, 0x1c, 0x96,
	0xdc, 0xd1, 0x3c, 0xf6, 0xe1, 0x9e, 0x41, 0xa5,
	0x27, 0x31, 0xa4, 0x4d, 0x57, 0x55, 0x7d, 0x0b,
	0xc7, 0xd3, 0x6f, 0x84, 0x61, 0x25, 0xb7, 0xdd,
	0x36, 0x58, 0x2e, 0xe6, 0x95, 0xa1, 0x39, 0x88,
	0xf5, 0xfa, 0x91, 0x60, 0x83, 0xab, 0x38, 0xe0,
	0xb5, 0x24, 0xed, 0x47, 0xea, 0x56, 0xa2, 0x68,
	0xf1, 0x77, 0x3d, 0x97, 0xc6, 0x21, 0x7a, 0xb8,
	0x14, 0x65, 0x3a, 0x43, 0x80, 0xdb, 0x52, 0x44,
	0x23, 0x12, 0x5b, 0x37, 0x17, 0xd6, 0xbd, 0xec,
	0x0d, 0xa0, 0x4f, 0xd5, 0x8a, 0x5e, 0x9b, 0x2c,
	0x4a, 0x5d, 0xef, 0x81, 0x79, 0x8d, 0x03, 0x64,
	0xdf, 0xb3, 0x04, 0x73, 0xaf, 0x87, 0xd8, 0x3b,
	0x7b, 0x46, 0xc9, 0x76, 0xe9, 0x51, 0x6a, 0xc2,
	0xd2, 0x1a, 0x7c, 0x4e, 0x93, 0x3f, 0x92, 0xc8,
	0x8b, 0xe8, 0x20, 0x72, 0x18, 0x99, 0xcb, 0x67,
	0, 0xb1, 0xf8, 0xda, 0x4b, 0x9c, 0x98, 0xee
	};

	bool success = true;
	std::size_t i = 0;
	for (; i != sizeof array / sizeof *array; ++i) {
	success = array [i] == result [i];
	if (!success)
	break;
	}

	rw_assert (success, 0, line,
	"randomly shuffled sequence failed to match "
	"the expected result (data portability failure) "
	"%d != %d at %zu",
	array [i], result [i], i + 1);

	#else
	rw_note (0, 0, 0,
	"_RWSTD_NO_EXT_PORTABLE_RANDOM_SEQUENCE is defined, "
	"no random_test available");
	#endif // _RWSTD_NO_EXT_PORTABLE_RANDOM_SEQUENCE
	}

	/**************************************************************************/

	/* extern */ int rw_opt_nloops = 1024; // --nloops=#
	/* extern */ int rw_opt_no_random; // --no-random
	/* extern */ int rw_opt_no_random_generator; // --no-random_generator
	/* extern */ int rw_opt_no_rand_test; // --no-rand_test


	static int run_test (int, char*[])
	{
	const std::size_t N = std::size_t (rw_opt_nloops);

	typedef RandomAccessIter<UserClass>::difference_type DiffT;
	typedef RandomGenerator<DiffT> RandGenT;

	if (rw_opt_no_random) {
	rw_note (0, __FILE__, __LINE__, "std::random test disabled");
	}
	else {
	rw_info (0, 0, 0,
	"template <class %s> "
	"std::random_shuffle (%1$s, %1$s)",
	"RandomAccessIterator");

	test_random_shuffle (__LINE__, N, RandomAccessIter<UserClass>(),
	(RandGenT)0, (UserClass)0, false);
	}

	if (rw_opt_no_rand_test) {
	rw_note (0, __FILE__, __LINE__, "random algorithm test disabled");
	}
	else {
	test_random_shuffle (__LINE__);
	}

	if (rw_opt_no_random_generator) {
	rw_note (0, __FILE__, __LINE__,
	"std::random with random_generator test disabled");
	}
	else {
	rw_info (0, 0, 0,
	"template <class %s, class %s> "
	"std::random_shuffle (%1$s, %1$s, %2$s)",
	"RandomAccessIterator", "RandomNumberGenerator");

	test_random_shuffle (__LINE__, N, RandomAccessIter<UserClass>(),
	(RandGenT)0, (UserClass)0, true);
	}

	return 0;
	}

	/**************************************************************************/

	int main (int argc, char *argv[])
	{
	return rw_test (argc, argv, __FILE__,
	"lib.alg.random_shuffle",
	0 /* no comment */, run_test,
	"\|-nloops#0 " // must be non-negative
	"\|-no-random# "
	"\|-no-random_generator# "
	"\|-no-rand_test",
	&rw_opt_nloops,
	&rw_opt_no_random,
	&rw_opt_no_random_generator,
	&rw_opt_no_rand_test);
	}