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267 lines
10 KiB
C++
267 lines
10 KiB
C++
// Copyright 2006 Johan Rade
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// Copyright 2011 Paul A. Bristow To incorporate into Boost.Math
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// Copyright 2012 Paul A. Bristow with new tests.
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifdef _MSC_VER
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# pragma warning(disable : 4127) // Expression is constant.
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#endif
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#define BOOST_TEST_MAIN
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#include <boost/test/auto_unit_test.hpp>
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#include <boost/math/special_functions/nonfinite_num_facets.hpp>
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#include "s_.ipp" // To create test strings like std::basic_string<CharType> s = S_("0 -0");
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#include <iomanip>
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#include <locale>
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#include <sstream>
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#include <ostream>
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#include <iostream>
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#include <iomanip>
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#include <limits>
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#include <iostream>
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namespace {
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// Using an anonymous namespace resolves ambiguities on platforms
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// with fpclassify etc functions at global scope.
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using namespace boost::math;
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using boost::math::signbit;
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using boost::math::changesign;
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using boost::math::isnan;
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//------------------------------------------------------------------------------
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template<class CharType, class ValType> void signed_zero_test_impl();
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// Loopback tests using all built-in char and floating-point types.
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BOOST_AUTO_TEST_CASE(signed_zero_test)
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{
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std::cout
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<< "BuildInfo:" << '\n'
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<< " platform " << BOOST_PLATFORM << '\n'
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<< " compiler " << BOOST_COMPILER << '\n'
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<< " STL " << BOOST_STDLIB << '\n'
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<< " Boost version " << BOOST_VERSION/100000 << "."
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<< BOOST_VERSION/100 % 1000 << "."
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<< BOOST_VERSION % 100
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<< std::endl;
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signed_zero_test_impl<char, float>();
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signed_zero_test_impl<char, double>();
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signed_zero_test_impl<char, long double>();
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signed_zero_test_impl<wchar_t, float>();
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signed_zero_test_impl<wchar_t, double>();
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signed_zero_test_impl<wchar_t, long double>();
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}
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template<class CharType, class ValType> void signed_zero_test_impl()
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{
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if (signbit(static_cast<CharType>(-1e-6f) / (std::numeric_limits<CharType>::max)()) != -0)
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{
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BOOST_TEST_MESSAGE("Signed zero is not supported on this platform!");
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return;
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}
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std::locale old_locale;
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std::locale tmp_locale(
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old_locale, new nonfinite_num_put<CharType>(signed_zero));
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std::locale new_locale(tmp_locale, new nonfinite_num_get<CharType>);
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std::basic_stringstream<CharType> ss;
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ss.imbue(new_locale);
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std::basic_string<CharType> null = S_("");
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std::basic_string<CharType> s1 = S_("123");
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ss << s1 << std::endl;
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ss.str(null);
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BOOST_CHECK(ss.str() == null); //
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ValType a1 = static_cast<ValType>(0); // zero.
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ValType a2 = (changesign)(static_cast<ValType>(0)); // negative signed zero.
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BOOST_CHECK(!(signbit)(a1)); //
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BOOST_CHECK((signbit)(a2));
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ss << a1 << ' ' << a2;
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std::basic_string<CharType> s = S_("0 -0"); // Expected.
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BOOST_CHECK(ss.str() == s);
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ValType b1, b2;
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ss >> b1 >> b2; // Read back in.
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BOOST_CHECK(b1 == a1);
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BOOST_CHECK(b2 == a2);
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BOOST_CHECK(!(signbit)(b1));
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BOOST_CHECK((signbit)(b2));
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BOOST_CHECK(ss.rdstate() == std::ios_base::eofbit);
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} // template<class CharType, class ValType> void signed_zero_test_impl()
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// Checking output of types char using first default & then using signed_zero flag.
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#define CHECKOUT(manips, expected)\
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{\
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{\
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std::locale old_locale;\
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std::locale tmp_locale(old_locale, new nonfinite_num_put<char>(0));\
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std::locale new_locale(tmp_locale, new nonfinite_num_get<char>);\
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std::ostringstream ss;\
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ss.imbue(new_locale);\
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ss << manips;\
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std::basic_string<char> s = S_(expected);\
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BOOST_CHECK_EQUAL(ss.str(), s);\
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}\
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{\
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std::locale old_locale;\
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std::locale tmp_locale(old_locale, new nonfinite_num_put<char>(signed_zero));\
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std::locale new_locale(tmp_locale, new nonfinite_num_get<char>);\
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std::ostringstream ss;\
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ss.imbue(new_locale);\
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ss << manips;\
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std::basic_string<char> s = S_(expected);\
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BOOST_CHECK_EQUAL(ss.str(), s);\
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}\
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}\
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BOOST_AUTO_TEST_CASE(misc_output_tests)
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{ // Tests of output using a variety of output options.
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//
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// STD libraries don't all format zeros the same,
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// so figure out what the library-specific formatting is
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// and then make sure that our facet produces the same...
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//
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bool precision_after = false; // Prints N digits after the point rather than N digits total
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bool triple_exponent = false; // Has 3 digits in the exponent rather than 2.
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std::stringstream ss;
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ss << std::showpoint << std::setprecision(6) << 0.0;
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if(ss.str().size() == 8)
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precision_after = true;
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ss.str("");
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ss << std::scientific << 0.0;
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triple_exponent = ss.str().size() - ss.str().find_first_of('e') == 5;
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// Positive zero.
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CHECKOUT(0, "0"); // integer zero.
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CHECKOUT(0., "0"); // double zero.
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CHECKOUT(std::setw(2) << 0., " 0");
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CHECKOUT(std::setw(4) << 0., " 0");
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CHECKOUT(std::right << std::setw(4) << 0., " 0");
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CHECKOUT(std::left << std::setw(4) << 0., "0 ");
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CHECKOUT(std::setw(4) << std::setfill('*') << 0., "***0");
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CHECKOUT(std::setw(4) << std::internal << std::setfill('*') << 0., "***0"); // left adjust sign and right adjust value.
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CHECKOUT(std::showpos << std::setw(4) << std::internal << std::setfill('*') << 0., "+**0"); // left adjust sign and right adjust value.
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if(precision_after)
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{
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// BOOST_STDLIB == ("Dinkumware standard library version" BOOST_STRINGIZE(_CPPLIB_VER)) )
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CHECKOUT(std::showpoint << 0., "0.000000"); // std::setprecision(6)
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CHECKOUT(std::setprecision(2) << std::showpoint << 0., "0.00");
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}
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else
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{
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CHECKOUT(std::showpoint << 0., "0.00000"); // std::setprecision(6)
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CHECKOUT(std::setprecision(2) << std::showpoint << 0., "0.0");
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}
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CHECKOUT(std::fixed << std::setw(5) << std::setfill('0') << std::setprecision(2) << 0., "00.00");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('0') << std::setprecision(2) << 0., "000.00");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('0') << std::setprecision(3) << 0., "00.000");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(3) << 0., "*0.000");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 0.0, "0.00**");
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CHECKOUT(std::showpos << 0., "+0");
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CHECKOUT(std::showpos << std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 0.0, "+0.00*");
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if(triple_exponent)
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{
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CHECKOUT(std::scientific << std::showpoint << std::setw(10) << std::setfill('*') << std::setprecision(1) << std::left << 0., "0.0e+000**");
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}
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else
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{
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CHECKOUT(std::scientific << std::showpoint << std::setw(10) << std::setfill('*') << std::setprecision(1) << std::left << 0., "0.0e+00***");
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}
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CHECKOUT(std::fixed << std::showpoint << std::setw(6) << std::setfill('*') << std::setprecision(3) << std::left << 0., "0.000*");
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double nz = (changesign)(static_cast<double>(0)); // negative signed zero.
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CHECKOUT(nz, "-0");
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// CHECKOUT(std::defaultfloat << nz, "-0"); Only for C++11
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CHECKOUT(std::showpos << nz, "-0"); // Ignore showpos because is negative.
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CHECKOUT(std::setw(2) << nz, "-0");
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CHECKOUT(std::setw(4) << nz, " -0");
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CHECKOUT(std::right << std::setw(4) << nz, " -0");
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CHECKOUT(std::left << std::setw(4) << nz, "-0 ");
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CHECKOUT(std::setw(4) << std::setfill('*') << nz, "**-0");
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CHECKOUT(std::setw(4) << std::internal << std::setfill('*') << nz, "-**0"); // Use std::internal to left adjust sign and right adjust value.
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CHECKOUT(std::showpos << std::setw(4) << std::internal << std::setfill('*') << nz, "-**0");
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CHECKOUT(std::fixed << std::setw(5) << std::setfill('0') << std::setprecision(2) << 0., "00.00");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('0') << std::setprecision(2) << 0., "000.00");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('0') << std::setprecision(3) << 0., "00.000");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(3) << 0., "*0.000");
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CHECKOUT(std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 0.0, "0.00**");
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CHECKOUT(std::setprecision(2) << nz, "-0"); // No showpoint, so no decimal point nor trailing zeros.
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if(precision_after)
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{
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CHECKOUT(std::setprecision(2) << std::showpoint << nz, "-0.00"); // or "-0.0"
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CHECKOUT(std::setw(1) << std::setprecision(3) << std::showpoint << nz, "-0.000"); // Not enough width for precision overflows width. or "-0.00"
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}
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else
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{
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CHECKOUT(std::setprecision(2) << std::showpoint << nz, "-0.0"); // or "-0.00"
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CHECKOUT(std::setw(1) << std::setprecision(3) << std::showpoint << nz, "-0.00"); // Not enough width for precision overflows width. or "-0.000"
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}
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if(triple_exponent)
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{
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CHECKOUT(std::scientific << std::showpoint << std::setw(10) << std::setfill('*') << std::setprecision(1) << std::left << nz, "-0.0e+000*"); // -0.0e+00**
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}
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else
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{
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CHECKOUT(std::scientific << std::showpoint << std::setw(10) << std::setfill('*') << std::setprecision(1) << std::left << nz, "-0.0e+00**"); // -0.0e+000*
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}
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CHECKOUT(std::fixed << std::showpoint << std::setw(6) << std::setfill('*') << std::setprecision(3) << std::left << 0., "0.000*");
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// Non zero values.
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CHECKOUT(std::showpos << std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 42., "+42.00");
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CHECKOUT(std::showpos << std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 4.2, "+4.20*");
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CHECKOUT(std::showpos << std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 1.22, "+1.22*");
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CHECKOUT(std::showpos << std::fixed << std::setw(6) << std::setfill('*') << std::setprecision(2) << std::left << 0.12, "+0.12*");
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CHECKOUT(std::setprecision(4) << std::showpoint << 1.2, "1.200");
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}
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} // anonymous namespace
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/*
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Output:
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test_signed_zero.cpp
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Running 2 test cases...
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Platform: Win32
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Compiler: Microsoft Visual C++ version 10.0
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STL : Dinkumware standard library version 520
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Boost : 1.49.0
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Entering test suite "Master Test Suite"
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Entering test case "signed_zero_test"
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Leaving test case "signed_zero_test"; testing time: 2ms
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Entering test case "misc_output_tests"
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Leaving test case "misc_output_tests"; testing time: 15ms
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Leaving test suite "Master Test Suite"
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*** No errors detected
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*/
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