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#include <QtTest/QtTest>

#include <QtGlobal>

#include <math.h>

class tst_QNumeric: public QObject

{

    Q_OBJECT

private slots:

    void fuzzyCompare_data();

    void fuzzyCompare();

    void qNan();

};

void tst_QNumeric::fuzzyCompare_data()

{

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

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

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

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

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

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

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

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

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

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

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

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

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

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

}

void tst_QNumeric::fuzzyCompare()

{

    QFETCH(double, val1);

    QFETCH(double, val2);

    QFETCH(bool, isEqual);

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

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

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

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

}

void tst_QNumeric::qNan()

{

    double nan = qQNaN();

#if defined( __INTEL_COMPILER)

    QCOMPARE((0 > nan), false);

    QCOMPARE((0 < nan), false);

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

#else

    if (0 > nan)

        QFAIL("compiler thinks 0 > nan");

#  if defined(Q_CC_DIAB)

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

#  else

    if (0 < nan)

        QFAIL("compiler thinks 0 < nan");

#  endif

#endif

    QVERIFY(qIsNaN(nan));

    QVERIFY(qIsNaN(nan + 1));

    QVERIFY(qIsNaN(-nan));

    double inf = qInf();

    QVERIFY(inf > 0);

    QVERIFY(-inf < 0);

    QVERIFY(qIsInf(inf));

    QVERIFY(qIsInf(-inf));

    QVERIFY(qIsInf(2*inf));

    QCOMPARE(1/inf, 0.0);

    QVERIFY(qIsNaN(0*nan));

    QVERIFY(qIsNaN(0*inf));

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

}

QTEST_APPLESS_MAIN(tst_QNumeric)

#include "tst_qnumeric.moc"