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libs/math/test/test_legacy_nonfinite.cpp

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+// Copyright (c) 2006 Johan Rade
+// Copyright (c) 2011 Paul A. Bristow comments
+// Distributed under 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)
+
+/*!
+\file
+\brief Legacy (non-C99) tests of the nonfinite num facets.
+
+\detail legacy_test outputs using nonfinite_num_put facet
+with legacy flag, and reads back in using nonfinite_num_ facet,
+and checks loopback OK.
+
+Also checks that output of infinity, -infinity and NaN are as expected,
+including the 'legacy' "1.#IND",  "1.#QNAN", "1.#SNAN" representations
+(was used by MSVC but now all represented on output by "1.#QNAN") 
+and qnan snan nanq nans (used by other systems)
+excluding C99 specification  "nan -nan nan -nan" and "inf -inf".
+*/
+
+#ifdef _MSC_VER
+#   pragma warning(disable : 4702)
+#endif
+
+#include <iomanip>
+#include <locale>
+#include <sstream>
+
+#define BOOST_TEST_MAIN
+#include <boost/test/auto_unit_test.hpp>
+
+//#include "almost_equal.hpp"
+//#include "S_.hpp"
+
+#include <boost/math/special_functions/nonfinite_num_facets.hpp>
+
+namespace {
+
+// The anonymous namespace resolves ambiguities on platforms
+// with fpclassify etc functions declared at global scope.
+
+using namespace boost::math;
+using boost::math::signbit;
+using boost::math::changesign;
+using boost::math::isnan;
+
+//------------------------------------------------------------------------------
+
+void legacy_test_inf();
+void legacy_test_nan();
+
+BOOST_AUTO_TEST_CASE(legacy_test)
+{
+    legacy_test_inf();
+    legacy_test_nan();
+}
+
+//------------------------------------------------------------------------------
+
+template<class CharType, class ValType> void legacy_test_inf_impl();
+
+void legacy_test_inf()
+{
+    legacy_test_inf_impl<char, float>();
+    legacy_test_inf_impl<char, double>();
+    legacy_test_inf_impl<char, long double>();
+    legacy_test_inf_impl<wchar_t, float>();
+    legacy_test_inf_impl<wchar_t, double>();
+    legacy_test_inf_impl<wchar_t, long double>();
+}
+
+template<class CharType, class ValType> void legacy_test_inf_impl()
+{
+    std::locale old_locale;
+    std::locale new_locale(old_locale, new nonfinite_num_get<CharType>(legacy));
+
+    std::basic_stringstream<CharType> ss;
+    ss.imbue(new_locale);
+
+    ValType a1 = std::numeric_limits<ValType>::infinity();
+    ValType a2 = -std::numeric_limits<ValType>::infinity();
+    ss << a1 << ' ' << a2;
+
+    ss << " 1.#INF";
+
+    ValType b1, b2, b3;
+    ss >> b1 >> b2 >> b3;
+
+    BOOST_CHECK(b1 == a1);
+    BOOST_CHECK(b2 == a2);
+    BOOST_CHECK(b3 == std::numeric_limits<ValType>::infinity());
+    BOOST_CHECK(ss.rdstate() == std::ios_base::eofbit);
+}
+
+//------------------------------------------------------------------------------
+
+template<class CharType, class ValType> void legacy_test_nan_impl();
+
+void legacy_test_nan()
+{
+    legacy_test_nan_impl<char, float>();
+    legacy_test_nan_impl<char, double>();
+    legacy_test_nan_impl<char, long double>();
+    legacy_test_nan_impl<wchar_t, float>();
+    legacy_test_nan_impl<wchar_t, double>();
+    legacy_test_nan_impl<wchar_t, long double>();
+}
+
+template<class CharType, class ValType> void legacy_test_nan_impl()
+{
+    std::locale old_locale;
+    std::locale new_locale(old_locale, new nonfinite_num_get<CharType>(legacy));
+
+    std::basic_stringstream<CharType> ss;
+    ss.imbue(new_locale);
+
+    ValType a1 = std::numeric_limits<ValType>::quiet_NaN();
+    ValType a2 = -std::numeric_limits<ValType>::quiet_NaN();
+    ValType a3 = std::numeric_limits<ValType>::signaling_NaN();
+    ValType a4 = -std::numeric_limits<ValType>::signaling_NaN();
+    ss << a1 << ' ' << a2 << ' ' << a3 << ' ' << a4; 
+
+    ss << " qnan snan nanq nans 1.#IND 1.#QNAN 1.#SNAN";
+
+    ValType b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11;
+    ss >> b1 >> b2 >> b3 >> b4 >> b5 >> b6 >> b7 >> b8 >> b9 >> b10 >> b11;
+
+    // std::cout << b11 << std::endl; // Confirms that legacy
+    // IND, SNAN and QNAN are considered the same,
+    // and both output the legacy string "1.#QNAN".
+
+    BOOST_CHECK((isnan)(b1));
+    BOOST_CHECK((isnan)(b2));
+    BOOST_CHECK((isnan)(b3));
+    BOOST_CHECK((isnan)(b4));
+    BOOST_CHECK((isnan)(b5));
+    BOOST_CHECK((isnan)(b6));
+    BOOST_CHECK((isnan)(b7));
+    BOOST_CHECK((isnan)(b8));
+    BOOST_CHECK((isnan)(b9));
+    BOOST_CHECK((isnan)(b10));
+    BOOST_CHECK((isnan)(b11));  //  Johan V3 1.#SNAN failed on MSVC 10.
+    // Change in nonfinite_num_facet.hpp Paul A. Bristow 11 Apr 11 makes work OK.
+/*
+    // These tests fail on platforms, such as gcc,
+    // that use the same representation of +nan and -nan.
+
+    BOOST_CHECK(!(signbit)(b1));
+    BOOST_CHECK((signbit)(b2));
+    BOOST_CHECK(!(signbit)(b3));
+    BOOST_CHECK((signbit)(b4));
+*/
+    BOOST_CHECK(!(signbit)(b5));
+    BOOST_CHECK(!(signbit)(b6));
+    BOOST_CHECK(!(signbit)(b7));
+    BOOST_CHECK(!(signbit)(b8));
+    BOOST_CHECK(!(signbit)(b9));
+    BOOST_CHECK(!(signbit)(b10));
+    BOOST_CHECK(!(signbit)(b11));  // Johan V3 1.#SNAN failed MSVC 10.
+
+    BOOST_CHECK(ss.rdstate() == std::ios_base::eofbit); // Fails if SNAN test fails.
+}
+
+//------------------------------------------------------------------------------
+
+}   // anonymous namespace
+
+/*
+
+Output:
+
+  legacy_test.vcxproj -> J:\Cpp\fp_facet\fp_facet\Debug\legacy_test.exe
+  Running 1 test case...
+  1.#QNAN
+  1.#QNAN
+  1.#QNAN
+  1.#QNAN
+  1.#QNAN
+  1.#QNAN
+  
+  *** No errors detected
+
+
+*/