ceph/src/boost/libs/multiprecision/test/test_convert_from_mpfi_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 #if defined(HAS_MPFI)
  11
  12 #include <boost/multiprecision/cpp_int.hpp>
  13 #include <boost/random/mersenne_twister.hpp>
  14 #include <boost/random/uniform_int.hpp>
  15 #include "test.hpp"
  16
  17 #if defined(HAS_GMP)
  18 #include <boost/multiprecision/gmp.hpp>
  19 #endif
  20 #if defined(HAS_MPFR)
  21 #include <boost/multiprecision/mpfr.hpp>
  22 #endif
  23 #if defined(HAS_MPFI)
  24 #include <boost/multiprecision/mpfi.hpp>
  25 #endif
  26 #ifdef HAS_TOMMATH
  27 #include <boost/multiprecision/tommath.hpp>
  28 #endif
  29 #ifdef HAS_FLOAT128
  30 #include <boost/multiprecision/float128.hpp>
  31 #endif
  32 #include <boost/multiprecision/cpp_bin_float.hpp>
  33 #include <boost/multiprecision/cpp_dec_float.hpp>
  34
  35 using namespace boost::multiprecision;
  36
  37 #ifdef BOOST_MSVC
  38 #pragma warning(disable : 4127)
  39 #endif
  40
  41 template <class T>
  42 T generate_random()
  43 {
  44    typedef int                   e_type;
  45    static boost::random::mt19937 gen;
  46    T                             val           = gen();
  47    T                             prev_val      = -1;
  48    int                           digits_so_far = 0;
  49    while (digits_so_far < std::numeric_limits<T>::digits)
  50    {
  51       val *= (gen.max)();
  52       prev_val = val;
  53       val += gen();
  54       digits_so_far += std::numeric_limits<boost::random::mt19937::result_type>::digits;
  55    }
  56    e_type e;
  57    val = frexp(val, &e);
  58
  59    static boost::random::uniform_int_distribution<e_type> ui(-20, 20);
  60    return ldexp(val, ui(gen));
  61 }
  62
  63 template <class From, class To>
  64 void test_convert_neg_int(From from, const std::integral_constant<bool, true>&)
  65 {
  66    from = -from;
  67    To t3(from);
  68    To t4 = from.template convert_to<To>();
  69    BOOST_CHECK_EQUAL(From(trunc(from)), From(t3));
  70    BOOST_CHECK_EQUAL(From(trunc(from)), From(t4));
  71 }
  72 template <class From, class To>
  73 void test_convert_neg_int(From const&, const std::integral_constant<bool, false>&)
  74 {
  75 }
  76
  77 template <class From, class To>
  78 void test_convert_imp(std::integral_constant<int, number_kind_floating_point> const&, std::integral_constant<int, number_kind_integer> const&)
  79 {
  80    for (unsigned i = 0; i < 100; ++i)
  81    {
  82       From from = generate_random<From>();
  83       To   t1(from);
  84       To   t2 = from.template convert_to<To>();
  85       BOOST_CHECK_EQUAL(From(trunc(from)), From(t1));
  86       BOOST_CHECK_EQUAL(From(trunc(from)), From(t2));
  87       test_convert_neg_int<From, To>(from, std::integral_constant<bool, std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed > ());
  88    }
  89 }
  90
  91 template <class From, class To>
  92 void test_convert_neg_rat(From from, const std::integral_constant<bool, true>&)
  93 {
  94    from = -from;
  95    To t3(from);
  96    To t4 = from.template convert_to<To>();
  97    BOOST_CHECK_EQUAL(From(t3), median(from));
  98    BOOST_CHECK_EQUAL(From(t4), median(from));
  99 }
 100 template <class From, class To>
 101 void test_convert_rat_int(From const&, const std::integral_constant<bool, false>&)
 102 {
 103 }
 104
 105 template <class From, class To>
 106 void test_convert_imp(std::integral_constant<int, number_kind_floating_point> const&, std::integral_constant<int, number_kind_rational> const&)
 107 {
 108    for (unsigned i = 0; i < 100; ++i)
 109    {
 110       From from = generate_random<From>();
 111       To   t1(from);
 112       To   t2 = from.template convert_to<To>();
 113       BOOST_CHECK_EQUAL(From(t1), median(from));
 114       BOOST_CHECK_EQUAL(From(t2), median(from));
 115       test_convert_neg_rat<From, To>(from, std::integral_constant<bool, std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed > ());
 116    }
 117 }
 118
 119 template <class From, class To>
 120 void test_convert_neg_float(From from, const std::integral_constant<bool, true>&)
 121 {
 122    from = -from;
 123    To t3(from);
 124    To t4 = from.template convert_to<To>();
 125    To answer(median(from).str());
 126    To tol = (std::max)(std::numeric_limits<To>::epsilon(), To(std::numeric_limits<From>::epsilon())) * 2;
 127    BOOST_CHECK_CLOSE_FRACTION(t3, answer, tol);
 128    BOOST_CHECK_CLOSE_FRACTION(t4, answer, tol);
 129 }
 130 template <class From, class To>
 131 void test_convert_neg_float(From const&, const std::integral_constant<bool, false>&)
 132 {
 133 }
 134
 135 template <class From, class To>
 136 void test_convert_imp(std::integral_constant<int, number_kind_floating_point> const&, std::integral_constant<int, number_kind_floating_point> const&)
 137 {
 138    for (unsigned i = 0; i < 100; ++i)
 139    {
 140       From from = generate_random<From>();
 141       To   t1(from);
 142       To   t2 = from.template convert_to<To>();
 143       To   answer(median(from).str());
 144       To   tol = (std::max)(std::numeric_limits<To>::epsilon(), To(std::numeric_limits<From>::epsilon())) * 2;
 145       BOOST_CHECK_CLOSE_FRACTION(t1, answer, tol);
 146       BOOST_CHECK_CLOSE_FRACTION(t2, answer, tol);
 147       test_convert_neg_float<From, To>(from, std::integral_constant<bool, std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed > ());
 148    }
 149 }
 150
 151 template <class From, class To>
 152 void test_convert()
 153 {
 154    test_convert_imp<From, To>(typename number_category<From>::type(), typename number_category<To>::type());
 155 }
 156
 157 int main()
 158 {
 159    try
 160    {
 161       test_convert<mpfi_float_50, cpp_int>();
 162       test_convert<mpfi_float_50, int128_t>();
 163       test_convert<mpfi_float_50, uint128_t>();
 164
 165       test_convert<mpfi_float_50, cpp_rational>();
 166
 167       test_convert<mpfi_float_50, cpp_dec_float_50>();
 168
 169 #if defined(HAS_GMP)
 170       test_convert<mpfi_float_50, mpz_int>();
 171       test_convert<mpfi_float_50, mpq_rational>();
 172       test_convert<mpfi_float_50, mpf_float_50>();
 173 #endif
 174 #if defined(HAS_MPFR)
 175       test_convert<mpfi_float_50, mpfr_float_50>();
 176 #endif
 177 #ifdef HAS_TOMMATH
 178       test_convert<mpfi_float_50, tom_int>();
 179       test_convert<mpfi_float_50, tom_rational>();
 180 #endif
 181 #ifdef HAS_FLOAT128
 182       test_convert<mpfi_float_50, float128>();
 183 #endif
 184    }
 185    catch (...)
 186    {
 187       return 1;
 188    }
 189    return boost::report_errors();
 190 }
 191
 192 #else
 193
 194 int main() { return 0; }
 195
 196 #endif