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    41 

    42 

    43 #include <QtTest/QtTest>

    44 #include <QtGlobal>

    45 

    46 #include <math.h>

    47 

    48 class tst_QNumeric: public QObject

    49 {

    50     Q_OBJECT

    51 

    52 private slots:

    53     void fuzzyCompare_data();

    54     void fuzzyCompare();

    55     void qNan();

    56 };

    57 

    58 void tst_QNumeric::fuzzyCompare_data()

    59 {

    60     QTest::addColumn<double>("val1");

    61     QTest::addColumn<double>("val2");

    62     QTest::addColumn<bool>("isEqual");

    63 

    64     QTest::newRow("zero") << 0.0 << 0.0 << true;

    65     QTest::newRow("ten") << 10.0 << 10.0 << true;

    66     QTest::newRow("large") << 1000000000.0 << 1000000000.0 << true;

    67     QTest::newRow("small") << 0.00000000001 << 0.00000000001 << true;

    68     QTest::newRow("eps") << 10.000000000000001 << 10.00000000000002 << true;

    69     QTest::newRow("eps2") << 10.000000000000001 << 10.000000000000009 << true;

    70 

    71     QTest::newRow("mis1") << 0.0 << 1.0 << false;

    72     QTest::newRow("mis2") << 0.0 << 10000000.0 << false;

    73     QTest::newRow("mis3") << 0.0 << 0.000000001 << false;

    74     QTest::newRow("mis4") << 100000000.0 << 0.000000001 << false;

    75     QTest::newRow("mis4") << 0.0000000001 << 0.000000001 << false;

    76 }

    77 

    78 void tst_QNumeric::fuzzyCompare()

    79 {

    80     QFETCH(double, val1);

    81     QFETCH(double, val2);

    82     QFETCH(bool, isEqual);

    83 

    84     QCOMPARE(::qFuzzyCompare(val1, val2), isEqual);

    85     QCOMPARE(::qFuzzyCompare(val2, val1), isEqual);

    86     QCOMPARE(::qFuzzyCompare(-val1, -val2), isEqual);

    87     QCOMPARE(::qFuzzyCompare(-val2, -val1), isEqual);

    88 }

    89 

    90 void tst_QNumeric::qNan()

    91 {

    92     double nan = qQNaN();

    93 #if defined( __INTEL_COMPILER)

    94     QCOMPARE((0 > nan), false);

    95     QCOMPARE((0 < nan), false);

    96     QSKIP("This fails due to a bug in the Intel Compiler", SkipAll);

    97 #else

    98     if (0 > nan)

    99         QFAIL("compiler thinks 0 > nan");

   100 

   101 #  if defined(Q_CC_DIAB)

   102     QWARN("!(0 < nan) would fail due to a bug in dcc");

   103 #  else

   104     if (0 < nan)

   105         QFAIL("compiler thinks 0 < nan");

   106 #  endif

   107 #endif

   108     QVERIFY(qIsNaN(nan));

   109     QVERIFY(qIsNaN(nan + 1));

   110     QVERIFY(qIsNaN(-nan));

   111     double inf = qInf();

   112     QVERIFY(inf > 0);

   113     QVERIFY(-inf < 0);

   114     QVERIFY(qIsInf(inf));

   115     QVERIFY(qIsInf(-inf));

   116     QVERIFY(qIsInf(2*inf));

   117     QCOMPARE(1/inf, 0.0);

   118     QVERIFY(qIsNaN(0*nan));

   119     QVERIFY(qIsNaN(0*inf));

   120     QVERIFY(qFuzzyCompare(1/inf, 0.0));

   121 }

   122 

   123 QTEST_APPLESS_MAIN(tst_QNumeric)

   124 #include "tst_qnumeric.moc"