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chrin
2017-09-26 08:50:02 +02:00
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libs/math/test/test_cstdfloat.cpp Normal file
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// Copyright Christopher Kormanyos 2014.
// Copyright John Maddock 2014.
// Copyright Paul A. Bristow 2014.
// Use, modification and distribution are subject to 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)
#include <cmath>
#include <complex>
#include <limits>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <string>
#include <boost/math/cstdfloat/cstdfloat_types.hpp>
#ifdef _MSC_VER
# pragma warning(disable : 4127) // conditional expression is constant.
# pragma warning(disable : 4512) // assignment operator could not be generated.
# pragma warning(disable : 4996) // use -D_SCL_SECURE_NO_WARNINGS.
#endif
#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp> // Boost.Test
#include <boost/test/floating_point_comparison.hpp>
//
// DESCRIPTION:
// ~~~~~~~~~~~~
//
// This file tests the implementation of floating-point typedefs having
// specified widths, as implemented in <boost/cstdfloat.hpp> and described
// in N3626 (proposed for C++14).
// For more information on <boost/cstdfloat.hpp> and the corresponding
// proposal of "Floating-Point Typedefs Having Specified Widths",
// see: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3626.pdf
// The tests:
//
// Perform sanity checks on boost::float16_t, boost::float32_t,
// boost::float64_t, boost::float80_t, and boost::float128_t when
// these types are available. In the sanity checks, we verify the
// formal behavior of the types and the macros for creating literal
// floating-point constants.
//
// An extended check is included for boost::float128_t. This checks
// the functionality of <cmath>, I/O stream operations, and <complex>
// functions for boost::float128_t.
#define TEST_CSTDFLOAT_SANITY_CHECK(the_digits) \
void sanity_check_##the_digits##_func() \
{ \
typedef boost::float##the_digits##_t float_type; \
\
BOOST_CONSTEXPR_OR_CONST int my_digits10 = std::numeric_limits<float_type>::digits10; \
\
{ \
BOOST_CONSTEXPR_OR_CONST float_type x = \
BOOST_FLOAT##the_digits##_C(0.33333333333333333333333333333333333333333); \
std::stringstream ss; \
ss << std::setprecision(my_digits10 - 1) \
<< x; \
std::string str = "0."; \
str += std::string(std::string::size_type(my_digits10 - 1), char('3')); \
BOOST_CHECK_EQUAL( ss.str(), str ); \
} \
{ \
BOOST_CONSTEXPR_OR_CONST float_type x = \
BOOST_FLOAT##the_digits##_C(0.66666666666666666666666666666666666666666); \
std::stringstream ss; \
ss << std::setprecision(my_digits10 - 1) \
<< x; \
std::string str = "0."; \
str += std::string(std::string::size_type(my_digits10 - 2), char('6')); \
str += "7"; \
BOOST_CHECK_EQUAL( ss.str(), str ); \
} \
{ \
const float_type x = BOOST_FLOAT##the_digits##_C(1.0) / test_cstdfloat::zero; \
const bool the_inf_test = ( std::numeric_limits<float_type>::has_infinity \
&& (x == std::numeric_limits<float_type>::infinity())); \
BOOST_CHECK_EQUAL( the_inf_test, true ); \
} \
{ \
using std::sqrt; \
const float_type x = sqrt(float_type(test_cstdfloat::minus_one)); \
const bool the_nan_test = ( std::numeric_limits<float_type>::has_quiet_NaN \
&& (x != x)); \
BOOST_CHECK_EQUAL( the_nan_test, true ); \
} \
{ \
const bool the_lim_test = \
(std::numeric_limits<boost::floatmax_t>::digits >= std::numeric_limits<float_type>::digits); \
BOOST_CHECK_EQUAL( the_lim_test, true ); \
} \
}
namespace test_cstdfloat
{
int zero;
int minus_one;
#if defined(BOOST_FLOATMAX_C)
BOOST_CONSTEXPR_OR_CONST int has_floatmax_t = 1;
#else
BOOST_CONSTEXPR_OR_CONST int has_floatmax_t = 0;
#endif
#if defined(BOOST_FLOAT16_C)
TEST_CSTDFLOAT_SANITY_CHECK(16)
#endif
#if defined(BOOST_FLOAT32_C)
TEST_CSTDFLOAT_SANITY_CHECK(32)
#endif
#if defined(BOOST_FLOAT64_C)
TEST_CSTDFLOAT_SANITY_CHECK(64)
#endif
#if defined(BOOST_FLOAT80_C)
TEST_CSTDFLOAT_SANITY_CHECK(80)
#endif
#if defined(BOOST_FLOAT128_C)
TEST_CSTDFLOAT_SANITY_CHECK(128)
void extend_check_128_func()
{
}
#endif // defined (BOOST_FLOAT128_C)
}
BOOST_AUTO_TEST_CASE(test_main)
{
test_cstdfloat::zero = 0;
test_cstdfloat::minus_one = -1;
// Perform basic sanity checks that verify both the existence of the proper
// floating-point literal macros as well as the correct digit handling
// for a given floating-point typedef having specified width.
BOOST_CHECK_EQUAL( test_cstdfloat::has_floatmax_t, 1 );
#if defined(BOOST_FLOAT16_C)
test_cstdfloat::sanity_check_16_func();
#endif
#if defined(BOOST_FLOAT32_C)
test_cstdfloat::sanity_check_32_func();
#endif
#if defined(BOOST_FLOAT64_C)
test_cstdfloat::sanity_check_64_func();
#endif
#if defined(BOOST_FLOAT80_C)
test_cstdfloat::sanity_check_80_func();
#endif
#if defined(BOOST_FLOAT128_C)
test_cstdfloat::sanity_check_128_func();
// Perform an extended check of boost::float128_t including
// a variety of functions from the C++ standard library.
test_cstdfloat::extend_check_128_func();
#endif // defined (BOOST_FLOAT128_C)
}