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+/* boost test_uniform_int.ipp
+ *
+ * Copyright Jens Maurer 2000
+ * 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)
+ *
+ * $Id: test_uniform_int.ipp 71018 2011-04-05 21:27:52Z steven_watanabe $
+ */
+
+#include <numeric>
+#include <sstream>
+#include <vector>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+#include <boost/limits.hpp>
+#include <boost/random/mersenne_twister.hpp>
+#include <boost/random/linear_congruential.hpp>
+#include <boost/random/lagged_fibonacci.hpp>
+#include <boost/random/variate_generator.hpp>
+#include "chi_squared_test.hpp"
+
+#define BOOST_TEST_MAIN
+#include <boost/test/unit_test.hpp>
+
+template<class Generator>
+void check_uniform_int(Generator & gen, int iter)
+{
+ int range = (gen.max)()-(gen.min)()+1;
+ std::vector<int> bucket(range);
+ for(int j = 0; j < iter; j++) {
+ int result = gen();
+ BOOST_CHECK_GE(result, (gen.min)());
+ BOOST_CHECK_LE(result, (gen.max)());
+ if(result >= (gen.min)() && result <= (gen.max)()) {
+ bucket[result-(gen.min)()]++;
+ }
+ }
+ int sum = std::accumulate(bucket.begin(), bucket.end(), 0);
+ std::vector<double> expected(range, 1.0 / range);
+ BOOST_CHECK_LT(chi_squared_test(bucket, expected, sum), 0.99);
+}
+
+BOOST_AUTO_TEST_CASE(test_uniform_int)
+{
+ boost::random::mt19937 gen;
+ typedef BOOST_RANDOM_UNIFORM_INT<int> int_gen;
+
+ // large range => small range (modulo case)
+ typedef boost::random::variate_generator<boost::random::mt19937&, int_gen> level_one;
+
+ level_one uint12(gen, int_gen(1,2));
+ BOOST_CHECK((uint12.distribution().min)() == 1);
+ BOOST_CHECK((uint12.distribution().max)() == 2);
+ check_uniform_int(uint12, 100000);
+ level_one uint16(gen, int_gen(1,6));
+ check_uniform_int(uint16, 100000);
+
+ // test chaining to get all cases in operator()
+
+ // identity map
+ typedef boost::random::variate_generator<level_one&, int_gen> level_two;
+ level_two uint01(uint12, int_gen(0, 1));
+ check_uniform_int(uint01, 100000);
+
+ // small range => larger range
+ level_two uint05(uint12, int_gen(-3, 2));
+ check_uniform_int(uint05, 100000);
+
+ // small range => larger range
+ level_two uint099(uint12, int_gen(0, 99));
+ check_uniform_int(uint099, 100000);
+
+ // larger => small range, rejection case
+ typedef boost::random::variate_generator<level_two&, int_gen> level_three;
+ level_three uint1_4(uint05, int_gen(1, 4));
+ check_uniform_int(uint1_4, 100000);
+
+ typedef BOOST_RANDOM_UNIFORM_INT<boost::uint8_t> int8_gen;
+ typedef boost::random::variate_generator<boost::random::mt19937&, int8_gen> gen8_t;
+
+ gen8_t gen8_03(gen, int8_gen(0, 3));
+
+ // use the full range of the type, where the destination
+ // range is a power of the source range
+ typedef boost::random::variate_generator<gen8_t, int8_gen> uniform_uint8;
+ uniform_uint8 uint8_0255(gen8_03, int8_gen(0, 255));
+ check_uniform_int(uint8_0255, 100000);
+
+ // use the full range, but a generator whose range is not
+ // a root of the destination range.
+ gen8_t gen8_02(gen, int8_gen(0, 2));
+ uniform_uint8 uint8_0255_2(gen8_02, int8_gen(0, 255));
+ check_uniform_int(uint8_0255_2, 100000);
+
+ // expand the range to a larger type.
+ typedef boost::random::variate_generator<gen8_t, int_gen> uniform_uint_from8;
+ uniform_uint_from8 uint0300(gen8_03, int_gen(0, 300));
+ check_uniform_int(uint0300, 100000);
+}
+
+#if !defined(BOOST_NO_INT64_T) && !defined(BOOST_NO_INTEGRAL_INT64_T)
+
+// testcase by Mario Rutti
+class ruetti_gen
+{
+public:
+ ruetti_gen() : state((max)() - 1) {}
+ typedef boost::uint64_t result_type;
+ result_type min BOOST_PREVENT_MACRO_SUBSTITUTION () const { return 0; }
+ result_type max BOOST_PREVENT_MACRO_SUBSTITUTION () const { return std::numeric_limits<result_type>::max BOOST_PREVENT_MACRO_SUBSTITUTION (); }
+ result_type operator()() { return state--; }
+private:
+ result_type state;
+};
+
+BOOST_AUTO_TEST_CASE(test_overflow_range)
+{
+ ruetti_gen gen;
+ BOOST_RANDOM_DISTRIBUTION dist(0, 10);
+ for (int i=0;i<10;i++) {
+ dist(gen);
+ }
+}
+
+#endif
+
+BOOST_AUTO_TEST_CASE(test_misc)
+{
+ // bug report from Ken Mahler: This used to lead to an endless loop.
+ typedef BOOST_RANDOM_UNIFORM_INT<unsigned int> uint_dist;
+ boost::minstd_rand mr;
+ boost::variate_generator<boost::minstd_rand, uint_dist> r2(mr,
+ uint_dist(0, 0xffffffff));
+ r2();
+ r2();
+
+ // bug report from Fernando Cacciola: This used to lead to an endless loop.
+ // also from Douglas Gregor
+ boost::variate_generator<boost::minstd_rand, BOOST_RANDOM_DISTRIBUTION > x(mr, BOOST_RANDOM_DISTRIBUTION(0, 8361));
+ x();
+
+ // bug report from Alan Stokes and others: this throws an assertion
+ boost::variate_generator<boost::minstd_rand, BOOST_RANDOM_DISTRIBUTION > y(mr, BOOST_RANDOM_DISTRIBUTION(1,1));
+ y();
+ y();
+ y();
+}