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171 lines
8.0 KiB
C++
171 lines
8.0 KiB
C++
// Copyright Christopher Kormanyos 2014.
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// Copyright John Maddock 2014.
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// Copyright Paul A. Bristow 2014.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#include <cmath>
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#include <complex>
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#include <limits>
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#include <iostream>
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#include <iomanip>
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#include <sstream>
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#include <string>
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#include <boost/math/cstdfloat/cstdfloat_types.hpp>
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#ifdef _MSC_VER
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# pragma warning(disable : 4127) // conditional expression is constant.
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# pragma warning(disable : 4512) // assignment operator could not be generated.
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# pragma warning(disable : 4996) // use -D_SCL_SECURE_NO_WARNINGS.
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#endif
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#define BOOST_TEST_MAIN
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#include <boost/test/unit_test.hpp> // Boost.Test
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#include <boost/test/floating_point_comparison.hpp>
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//
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// DESCRIPTION:
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// ~~~~~~~~~~~~
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//
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// This file tests the implementation of floating-point typedefs having
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// specified widths, as implemented in <boost/cstdfloat.hpp> and described
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// in N3626 (proposed for C++14).
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// For more information on <boost/cstdfloat.hpp> and the corresponding
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// proposal of "Floating-Point Typedefs Having Specified Widths",
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// see: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2013/n3626.pdf
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// The tests:
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//
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// Perform sanity checks on boost::float16_t, boost::float32_t,
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// boost::float64_t, boost::float80_t, and boost::float128_t when
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// these types are available. In the sanity checks, we verify the
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// formal behavior of the types and the macros for creating literal
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// floating-point constants.
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//
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// An extended check is included for boost::float128_t. This checks
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// the functionality of <cmath>, I/O stream operations, and <complex>
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// functions for boost::float128_t.
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#define TEST_CSTDFLOAT_SANITY_CHECK(the_digits) \
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void sanity_check_##the_digits##_func() \
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{ \
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typedef boost::float##the_digits##_t float_type; \
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\
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BOOST_CONSTEXPR_OR_CONST int my_digits10 = std::numeric_limits<float_type>::digits10; \
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\
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{ \
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BOOST_CONSTEXPR_OR_CONST float_type x = \
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BOOST_FLOAT##the_digits##_C(0.33333333333333333333333333333333333333333); \
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std::stringstream ss; \
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ss << std::setprecision(my_digits10 - 1) \
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<< x; \
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std::string str = "0."; \
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str += std::string(std::string::size_type(my_digits10 - 1), char('3')); \
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BOOST_CHECK_EQUAL( ss.str(), str ); \
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} \
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{ \
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BOOST_CONSTEXPR_OR_CONST float_type x = \
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BOOST_FLOAT##the_digits##_C(0.66666666666666666666666666666666666666666); \
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std::stringstream ss; \
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ss << std::setprecision(my_digits10 - 1) \
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<< x; \
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std::string str = "0."; \
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str += std::string(std::string::size_type(my_digits10 - 2), char('6')); \
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str += "7"; \
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BOOST_CHECK_EQUAL( ss.str(), str ); \
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} \
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{ \
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const float_type x = BOOST_FLOAT##the_digits##_C(1.0) / test_cstdfloat::zero; \
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const bool the_inf_test = ( std::numeric_limits<float_type>::has_infinity \
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&& (x == std::numeric_limits<float_type>::infinity())); \
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BOOST_CHECK_EQUAL( the_inf_test, true ); \
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} \
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{ \
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using std::sqrt; \
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const float_type x = sqrt(float_type(test_cstdfloat::minus_one)); \
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const bool the_nan_test = ( std::numeric_limits<float_type>::has_quiet_NaN \
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&& (x != x)); \
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BOOST_CHECK_EQUAL( the_nan_test, true ); \
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} \
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{ \
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const bool the_lim_test = \
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(std::numeric_limits<boost::floatmax_t>::digits >= std::numeric_limits<float_type>::digits); \
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BOOST_CHECK_EQUAL( the_lim_test, true ); \
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} \
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}
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namespace test_cstdfloat
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{
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int zero;
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int minus_one;
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#if defined(BOOST_FLOATMAX_C)
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BOOST_CONSTEXPR_OR_CONST int has_floatmax_t = 1;
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#else
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BOOST_CONSTEXPR_OR_CONST int has_floatmax_t = 0;
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#endif
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#if defined(BOOST_FLOAT16_C)
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TEST_CSTDFLOAT_SANITY_CHECK(16)
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#endif
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#if defined(BOOST_FLOAT32_C)
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TEST_CSTDFLOAT_SANITY_CHECK(32)
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#endif
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#if defined(BOOST_FLOAT64_C)
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TEST_CSTDFLOAT_SANITY_CHECK(64)
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#endif
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#if defined(BOOST_FLOAT80_C)
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TEST_CSTDFLOAT_SANITY_CHECK(80)
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#endif
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#if defined(BOOST_FLOAT128_C)
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TEST_CSTDFLOAT_SANITY_CHECK(128)
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void extend_check_128_func()
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{
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}
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#endif // defined (BOOST_FLOAT128_C)
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}
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BOOST_AUTO_TEST_CASE(test_main)
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{
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test_cstdfloat::zero = 0;
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test_cstdfloat::minus_one = -1;
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// Perform basic sanity checks that verify both the existence of the proper
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// floating-point literal macros as well as the correct digit handling
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// for a given floating-point typedef having specified width.
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BOOST_CHECK_EQUAL( test_cstdfloat::has_floatmax_t, 1 );
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#if defined(BOOST_FLOAT16_C)
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test_cstdfloat::sanity_check_16_func();
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#endif
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#if defined(BOOST_FLOAT32_C)
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test_cstdfloat::sanity_check_32_func();
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#endif
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#if defined(BOOST_FLOAT64_C)
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test_cstdfloat::sanity_check_64_func();
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#endif
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#if defined(BOOST_FLOAT80_C)
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test_cstdfloat::sanity_check_80_func();
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#endif
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#if defined(BOOST_FLOAT128_C)
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test_cstdfloat::sanity_check_128_func();
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// Perform an extended check of boost::float128_t including
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// a variety of functions from the C++ standard library.
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test_cstdfloat::extend_check_128_func();
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#endif // defined (BOOST_FLOAT128_C)
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}
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