ceph/src/boost/libs/multiprecision/test/test_convert_from_cpp_int.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 http://www.boost.org/LICENSE_1_
   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 "test.hpp"
  13
  14 #if defined(HAS_GMP)
  15 #include <boost/multiprecision/gmp.hpp>
  16 #endif
  17 #if defined(HAS_MPFR)
  18 #include <boost/multiprecision/mpfr.hpp>
  19 #endif
  20 #if defined(HAS_MPFI)
  21 #include <boost/multiprecision/mpfi.hpp>
  22 #endif
  23 #ifdef HAS_TOMMATH
  24 #include <boost/multiprecision/tommath.hpp>
  25 #endif
  26 #ifdef HAS_FLOAT128
  27 #include <boost/multiprecision/float128.hpp>
  28 #endif
  29 #include <boost/multiprecision/cpp_bin_float.hpp>
  30 #include <boost/multiprecision/cpp_dec_float.hpp>
  31
  32
  33 using namespace boost::multiprecision;
  34
  35 #ifdef BOOST_MSVC
  36 #pragma warning(disable:4127)
  37 #endif
  38
  39
  40 template <class T>
  41 T generate_random(unsigned bits_wanted)
  42 {
  43    static boost::random::mt19937 gen;
  44    typedef boost::random::mt19937::result_type random_type;
  45
  46    T max_val;
  47    unsigned digits;
  48    if(std::numeric_limits<T>::is_bounded && (bits_wanted == (unsigned)std::numeric_limits<T>::digits))
  49    {
  50       max_val = (std::numeric_limits<T>::max)();
  51       digits = std::numeric_limits<T>::digits;
  52    }
  53    else
  54    {
  55       max_val = T(1) << bits_wanted;
  56       digits = bits_wanted;
  57    }
  58
  59    unsigned bits_per_r_val = std::numeric_limits<random_type>::digits - 1;
  60    while((random_type(1) << bits_per_r_val) > (gen.max)()) --bits_per_r_val;
  61
  62    unsigned terms_needed = digits / bits_per_r_val + 1;
  63
  64    T val = 0;
  65    for(unsigned i = 0; i < terms_needed; ++i)
  66    {
  67       val *= (gen.max)();
  68       val += gen();
  69    }
  70    val %= max_val;
  71    return val;
  72 }
  73
  74 template <class From, class To>
  75 void test_convert_neg_int(From from, const boost::mpl::true_&)
  76 {
  77    from = -from;
  78    To t3(from);
  79    To t4 = from.template convert_to<To>();
  80    BOOST_CHECK_EQUAL(from.str(), t3.str());
  81    BOOST_CHECK_EQUAL(from.str(), t4.str());
  82 }
  83 template <class From, class To>
  84 void test_convert_neg_int(From const&, const boost::mpl::false_&)
  85 {
  86 }
  87
  88 template <class From, class To>
  89 void test_convert_imp(boost::mpl::int_<number_kind_integer> const&, boost::mpl::int_<number_kind_integer> const&)
  90 {
  91    int bits_wanted = (std::min)((std::min)(std::numeric_limits<From>::digits, std::numeric_limits<To>::digits), 2000);
  92
  93    for(unsigned i = 0; i < 100; ++i)
  94    {
  95       From from = generate_random<From>(bits_wanted);
  96       To t1(from);
  97       To t2 = from.template convert_to<To>();
  98       BOOST_CHECK_EQUAL(from.str(), t1.str());
  99       BOOST_CHECK_EQUAL(from.str(), t2.str());
 100       test_convert_neg_int<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
 101    }
 102 }
 103
 104 template <class From, class To>
 105 void test_convert_neg_rat(From from, const boost::mpl::true_&)
 106 {
 107    from = -from;
 108    To t3(from);
 109    To t4 = from.template convert_to<To>();
 110    BOOST_CHECK_EQUAL(from.str(), numerator(t3).str());
 111    BOOST_CHECK_EQUAL(from.str(), numerator(t4).str());
 112 }
 113 template <class From, class To>
 114 void test_convert_neg_rat(From const&, const boost::mpl::false_&)
 115 {
 116 }
 117
 118 template <class From, class To>
 119 void test_convert_imp(boost::mpl::int_<number_kind_integer> const&, boost::mpl::int_<number_kind_rational> const&)
 120 {
 121    int bits_wanted = (std::min)((std::min)(std::numeric_limits<From>::digits, std::numeric_limits<To>::digits), 2000);
 122
 123    for(unsigned i = 0; i < 100; ++i)
 124    {
 125       From from = generate_random<From>(bits_wanted);
 126       To t1(from);
 127       To t2 = from.template convert_to<To>();
 128       BOOST_CHECK_EQUAL(from.str(), numerator(t1).str());
 129       BOOST_CHECK_EQUAL(from.str(), numerator(t2).str());
 130       test_convert_neg_rat<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
 131    }
 132 }
 133
 134 template <class From, class To>
 135 void test_convert_neg_float(From from, const boost::mpl::true_&)
 136 {
 137    from = -from;
 138    To t3(from);
 139    To t4 = from.template convert_to<To>();
 140    To check(from.str() + ".0");
 141    BOOST_CHECK_EQUAL(t3, check);
 142    BOOST_CHECK_EQUAL(t4, check);
 143 }
 144 template <class From, class To>
 145 void test_convert_neg_float(From const&, const boost::mpl::false_&)
 146 {
 147 }
 148
 149 template <class From, class To>
 150 void test_convert_imp(boost::mpl::int_<number_kind_integer> const&, boost::mpl::int_<number_kind_floating_point> const&)
 151 {
 152    int bits_wanted = (std::min)((std::min)(std::numeric_limits<From>::digits, std::numeric_limits<To>::digits), 2000);
 153
 154    for(unsigned i = 0; i < 100; ++i)
 155    {
 156       From from = generate_random<From>(bits_wanted);
 157       To t1(from);
 158       To t2 = from.template convert_to<To>();
 159       To check(from.str() + ".0");
 160       BOOST_CHECK_EQUAL(t1, check);
 161       BOOST_CHECK_EQUAL(t2, check);
 162       test_convert_neg_float<From, To>(from, boost::mpl::bool_<std::numeric_limits<From>::is_signed && std::numeric_limits<To>::is_signed>());
 163    }
 164 }
 165
 166
 167 template <class From, class To>
 168 void test_convert()
 169 {
 170    test_convert_imp<From, To>(typename number_category<From>::type(), typename number_category<To>::type());
 171 }
 172
 173
 174 int main()
 175 {
 176    test_convert<cpp_int, int128_t>();
 177    test_convert<int128_t, cpp_int>();
 178
 179    test_convert<cpp_int, cpp_rational>();
 180    test_convert<int128_t, cpp_rational>();
 181    test_convert<uint128_t, cpp_rational>();
 182
 183    test_convert<cpp_int, cpp_bin_float_50>();
 184    test_convert<int128_t, cpp_bin_float_50>();
 185    test_convert<uint128_t, cpp_bin_float_50>();
 186
 187    test_convert<cpp_int, cpp_dec_float_50>();
 188    test_convert<int128_t, cpp_dec_float_50>();
 189    test_convert<uint128_t, cpp_dec_float_50>();
 190
 191 #if defined(HAS_GMP)
 192    test_convert<cpp_int, mpz_int>();
 193    test_convert<int128_t, mpz_int>();
 194    test_convert<uint128_t, mpz_int>();
 195
 196    test_convert<cpp_int, mpq_rational>();
 197    test_convert<int128_t, mpq_rational>();
 198    test_convert<uint128_t, mpq_rational>();
 199
 200    test_convert<cpp_int, mpf_float_50>();
 201    test_convert<int128_t, mpf_float_50>();
 202    test_convert<uint128_t, mpf_float_50>();
 203 #endif
 204 #if defined(HAS_MPFR)
 205    test_convert<cpp_int, mpfr_float_50>();
 206    test_convert<int128_t, mpfr_float_50>();
 207    test_convert<uint128_t, mpfr_float_50>();
 208 #endif
 209 #if defined(HAS_MPFI)
 210    test_convert<cpp_int, mpfi_float_50>();
 211    test_convert<int128_t, mpfi_float_50>();
 212    test_convert<uint128_t, mpfi_float_50>();
 213 #endif
 214 #ifdef HAS_TOMMATH
 215    test_convert<cpp_int, tom_int>();
 216    test_convert<int128_t, tom_int>();
 217    test_convert<uint128_t, tom_int>();
 218
 219    test_convert<cpp_int, tom_rational>();
 220    test_convert<int128_t, tom_rational>();
 221    test_convert<uint128_t, tom_rational>();
 222 #endif
 223 #ifdef HAS_FLOAT128
 224    test_convert<cpp_int, float128>();
 225    test_convert<int128_t, float128>();
 226    test_convert<uint128_t, float128>();
 227 #endif
 228    return boost::report_errors();
 229 }
 230