ceph/src/boost/libs/multiprecision/test/test_convert_from_cpp_dec_float.cpp

   1 ///////////////////////////////////////////////////////////////
   2 //  Copyright 2012 John Maddock. Distributed under the Boost
   3 //  Software License, Version 1.0. (See accompanying file
   4 //  LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
   5
   6 #ifdef _MSC_VER
   7 #define _SCL_SECURE_NO_WARNINGS
   8 #endif
   9
  10 #include <boost/multiprecision/cpp_int.hpp>
  11 #include <boost/random/mersenne_twister.hpp>
  12 #include <boost/random/uniform_int.hpp>
  13 #include "test.hpp"
  14
  15 #if defined(HAS_GMP)
  16 #include <boost/multiprecision/gmp.hpp>
  17 #endif
  18 #if defined(HAS_MPFR)
  19 #include <boost/multiprecision/mpfr.hpp>
  20 #endif
  21 #if defined(HAS_MPFI)
  22 #include <boost/multiprecision/mpfi.hpp>
  23 #endif
  24 #ifdef HAS_TOMMATH
  25 #include <boost/multiprecision/tommath.hpp>
  26 #endif
  27 #ifdef HAS_FLOAT128
  28 #include <boost/multiprecision/float128.hpp>
  29 #endif
  30 #include <boost/multiprecision/cpp_bin_float.hpp>
  31 #include <boost/multiprecision/cpp_dec_float.hpp>
  32
  33 using namespace boost::multiprecision;
  34
  35 #ifdef BOOST_MSVC
  36 #pragma warning(disable : 4127)
  37 #endif
  38
  39 template <class T>
  40 T generate_random()
  41 {
  42    typedef int                   e_type;
  43    static boost::random::mt19937 gen;
  44    T                             val      = gen();
  45    T                             prev_val = -1;
  46    while (val != prev_val)
  47    {
  48       val *= (gen.max)();
  49       prev_val = val;
  50       val += gen();
  51    }
  52    e_type e;
  53    val = frexp(val, &e);
  54
  55    static boost::random::uniform_int_distribution<e_type> ui(-20, 20);
  56    return ldexp(val, ui(gen));
  57 }
  58
  59 template <class From, class To>
  60 void test_convert_neg_int(From from, const boost::mpl::true_&)
  61 {
  62    from = -from;
  63    To t3(from);
  64    To t4 = from.template convert_to<To>();
  65    BOOST_CHECK_EQUAL(From(trunc(from)), From(t3));
  66    BOOST_CHECK_EQUAL(From(trunc(from)), From(t4));
  67 }
  68 template <class From, class To>
  69 void test_convert_neg_int(From const&, const boost::mpl::false_&)
  70 {
  71 }
  72
  73 template <class From, class To>
  74 void test_convert_imp(boost::mpl::int_<number_kind_floating_point> const&, boost::mpl::int_<number_kind_integer> const&)
  75 {
  76    for (unsigned i = 0; i < 100; ++i)
  77    {
  78       From from = generate_random<From>();
  79       To   t1(from);
  80       To   t2 = from.template convert_to<To>();
  81       BOOST_CHECK_EQUAL(From(trunc(from)), From(t1));
  82       BOOST_CHECK_EQUAL(From(trunc(from)), From(t2));
  83       test_convert_neg_int<From, To>(from, boost::mpl::bool_ < std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed > ());
  84    }
  85 }
  86
  87 template <class From, class To>
  88 void test_convert_neg_rat(From from, const boost::mpl::true_&)
  89 {
  90    from = -from;
  91    To   t3(from);
  92    To   t4  = from.template convert_to<To>();
  93    From tol = std::numeric_limits<From>::epsilon();
  94    BOOST_CHECK_CLOSE_FRACTION(From(t3), from, tol);
  95    BOOST_CHECK_CLOSE_FRACTION(From(t4), from, tol);
  96 }
  97 template <class From, class To>
  98 void test_convert_rat_int(From const&, const boost::mpl::false_&)
  99 {
 100 }
 101
 102 template <class From, class To>
 103 void test_convert_imp(boost::mpl::int_<number_kind_floating_point> const&, boost::mpl::int_<number_kind_rational> const&)
 104 {
 105    for (unsigned i = 0; i < 100; ++i)
 106    {
 107       From from = generate_random<From>();
 108       To   t1(from);
 109       To   t2  = from.template convert_to<To>();
 110       From tol = std::numeric_limits<From>::epsilon();
 111       BOOST_CHECK_CLOSE_FRACTION(From(t1), from, tol);
 112       BOOST_CHECK_CLOSE_FRACTION(From(t2), from, tol);
 113       test_convert_neg_rat<From, To>(from, boost::mpl::bool_ < std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed > ());
 114    }
 115 }
 116
 117 template <class From, class To>
 118 void test_convert_neg_float(From from, const boost::mpl::true_&)
 119 {
 120    from = -from;
 121    To t3(from);
 122    To t4 = from.template convert_to<To>();
 123    To answer(from.str());
 124    To tol = (std::max)(std::numeric_limits<To>::epsilon(), To(std::numeric_limits<From>::epsilon())) * 2;
 125    BOOST_CHECK_CLOSE_FRACTION(t3, answer, tol);
 126    BOOST_CHECK_CLOSE_FRACTION(t4, answer, tol);
 127 }
 128 template <class From, class To>
 129 void test_convert_neg_float(From const&, const boost::mpl::false_&)
 130 {
 131 }
 132
 133 template <class From, class To>
 134 void test_convert_imp(boost::mpl::int_<number_kind_floating_point> const&, boost::mpl::int_<number_kind_floating_point> const&)
 135 {
 136    for (unsigned i = 0; i < 100; ++i)
 137    {
 138       From from = generate_random<From>();
 139       To   t1(from);
 140       To   t2 = from.template convert_to<To>();
 141       To   answer(from.str());
 142       To   tol = (std::max)(std::numeric_limits<To>::epsilon(), To(std::numeric_limits<From>::epsilon())) * 2;
 143       BOOST_CHECK_CLOSE_FRACTION(t1, answer, tol);
 144       BOOST_CHECK_CLOSE_FRACTION(t2, answer, tol);
 145       test_convert_neg_float<From, To>(from, boost::mpl::bool_ < std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed > ());
 146    }
 147 }
 148
 149 template <class From, class To>
 150 void test_convert()
 151 {
 152    test_convert_imp<From, To>(typename number_category<From>::type(), typename number_category<To>::type());
 153 }
 154
 155 int main()
 156 {
 157    test_convert<cpp_dec_float_50, cpp_int>();
 158    test_convert<cpp_dec_float_50, int128_t>();
 159    test_convert<cpp_dec_float_50, uint128_t>();
 160
 161    test_convert<cpp_dec_float_50, cpp_rational>();
 162
 163    test_convert<cpp_dec_float_50, cpp_bin_float_50>();
 164
 165 #if defined(HAS_GMP)
 166    test_convert<cpp_dec_float_50, mpz_int>();
 167    test_convert<cpp_dec_float_50, mpq_rational>();
 168    test_convert<cpp_dec_float_50, mpf_float_50>();
 169 #endif
 170 #if defined(HAS_MPFR)
 171    test_convert<cpp_dec_float_50, mpfr_float_50>();
 172 #endif
 173 #if defined(HAS_MPFI)
 174    test_convert<cpp_dec_float_50, mpfi_float_50>();
 175 #endif
 176 #ifdef HAS_TOMMATH
 177    test_convert<cpp_dec_float_50, tom_int>();
 178    test_convert<cpp_dec_float_50, tom_rational>();
 179 #endif
 180 #ifdef HAS_FLOAT128
 181    test_convert<cpp_dec_float_50, float128>();
 182 #endif
 183    return boost::report_errors();
 184 }