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

   1 ///////////////////////////////////////////////////////////////
   2 //  Copyright Christopher Kormanyos 2002 - 2011.
   3 //  Copyright 2011 John Maddock. Distributed under the Boost
   4 //  Software License, Version 1.0. (See accompanying file
   5 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_
   6 //
   7 // This work is based on an earlier work:
   8 // "Algorithm 910: A Portable C++ Multiple-Precision System for Special-Function Calculations",
   9 // in ACM TOMS, {VOL 37, ISSUE 4, (February 2011)} (C) ACM, 2011. http://doi.acm.org/10.1145/1916461.1916469
  10
  11 #ifdef _MSC_VER
  12 #  define _SCL_SECURE_NO_WARNINGS
  13 #endif
  14
  15 #include <boost/detail/lightweight_test.hpp>
  16 #include <boost/array.hpp>
  17 #include "test.hpp"
  18
  19 #include <boost/multiprecision/mpfr.hpp>
  20 #include <boost/multiprecision/gmp.hpp>
  21
  22 int main()
  23 {
  24    using namespace boost::multiprecision;
  25    //
  26    // Test interconversions between GMP supported backends:
  27    //
  28    mpf_t mpf;
  29    mpz_t mpz;
  30    mpq_t mpq;
  31    mpfr_t mpfr;
  32    mpf_init2(mpf, 100);
  33    mpf_set_ui(mpf, 2u);
  34    mpz_init(mpz);
  35    mpz_set_ui(mpz, 2u);
  36    mpq_init(mpq);
  37    mpq_set_ui(mpq, 2u, 1u);
  38    mpfr_init(mpfr);
  39    mpfr_set_ui(mpfr, 2u, GMP_RNDN);
  40
  41    BOOST_TEST(mpfr_float(mpf) == 2);
  42    BOOST_TEST(mpfr_float_50(mpf) == 2);
  43    BOOST_TEST(mpfr_float(mpz) == 2);
  44    BOOST_TEST(mpfr_float_50(mpz) == 2);
  45    BOOST_TEST(mpfr_float(mpq) == 2);
  46    BOOST_TEST(mpfr_float_50(mpq) == 2);
  47    BOOST_TEST(mpfr_float(mpfr) == 2);
  48    BOOST_TEST(mpfr_float_50(mpfr) == 2);
  49
  50    mpfr_float f0;
  51    mpfr_float_50 f50;
  52    f0 = mpf;
  53    BOOST_TEST(f0 == 2);
  54    f0 = 0;
  55    f0 = mpz;
  56    BOOST_TEST(f0 == 2);
  57    f0 = 0;
  58    f0 = mpq;
  59    BOOST_TEST(f0 == 2);
  60    f0 = mpfr;
  61    BOOST_TEST(f0 == 2);
  62
  63    f50 = mpf;
  64    BOOST_TEST(f50 == 2);
  65    f50 = 0;
  66    f50 = mpz;
  67    BOOST_TEST(f50 == 2);
  68    f50 = 0;
  69    f50 = mpq;
  70    BOOST_TEST(f50 == 2);
  71    f50 = mpfr;
  72    BOOST_TEST(f50 == 2);
  73
  74    f50 = 4;
  75    f0 = f50;
  76    BOOST_TEST(f0 == 4);
  77    f0 = 3;
  78    f50 = f0;
  79    BOOST_TEST(f50 == 3);
  80    f50 = 4;
  81    BOOST_TEST(mpfr_float(f50) == 4);
  82    BOOST_TEST(mpfr_float_50(f0) == 3);
  83
  84    mpz_int iz(2);
  85    mpq_rational rat(2);
  86    mpf_float gf(2);
  87    f50 = 3;
  88    f50 = iz;
  89    BOOST_TEST(f50 == 2);
  90    f50 = 3;
  91    f0 = iz;
  92    BOOST_TEST(f0 == 2);
  93    f50 = 3;
  94    f0 = gf;
  95    BOOST_TEST(f0 == 2);
  96    BOOST_TEST(mpfr_float(iz) == 2);
  97    BOOST_TEST(mpfr_float_50(iz) == 2);
  98    BOOST_TEST(mpfr_float(rat) == 2);
  99    BOOST_TEST(mpfr_float_50(rat) == 2);
 100    BOOST_TEST(mpfr_float(gf) == 2);
 101    BOOST_TEST(mpfr_float_50(gf) == 2);
 102
 103    //
 104    // Conversions involving precision only:
 105    //
 106    mpfr_float::default_precision(30);
 107    f50 = 2;
 108    mpfr_float_100   f100(3);
 109    mpfr_float       f0a(4);
 110    mpfr_float       f0b(f100);
 111    BOOST_TEST(f0a.precision() == 30);
 112    BOOST_TEST(f0b.precision() == 100);
 113    f0a = f100;
 114    BOOST_TEST(f0a == 3);
 115    BOOST_TEST(f0a.precision() == 100);
 116
 117    f100 = f50;
 118    BOOST_TEST(f100 == 2);
 119
 120    f50 = static_cast<mpfr_float_50>(f100);
 121
 122    mpf_clear(mpf);
 123    mpz_clear(mpz);
 124    mpq_clear(mpq);
 125    mpfr_clear(mpfr);
 126
 127    return boost::report_errors();
 128 }
 129
 130
 131