C++ QCache::contains方法代码示例

void tst_QCache::insert()
{
    QCache<QString, Foo> cache;

    Foo *f1 = new Foo;
    cache.insert("one", f1, 1);
    QVERIFY(cache.contains("one"));

    Foo *f2 = new Foo;
    cache.insert("two", f2, 2);
    QVERIFY(cache.contains("two"));
    QCOMPARE(cache.size(), 2);

    Foo *f3 = new Foo;
    cache.insert("two", f3, 2);
    QVERIFY(cache.contains("two"));
    QCOMPARE(cache.size(), 2);

    QVERIFY(cache["two"] == f3);
    QCOMPARE(Foo::count, 2);

    /*
        If the new item is too big, any item with the same name in
        the cache must still be removed, otherwise the application
        might get bad results.
    */
    Foo *f4 = new Foo;
    cache.insert("two", f4, 10000);
    QVERIFY(!cache.contains("two"));
    QCOMPARE(cache.size(), 1);
    QCOMPARE(Foo::count, 1);
}

void tst_QCache::totalCost()
{
    QCache<QString, int> cache;
    QCOMPARE(cache.totalCost(), 0);

    cache.insert("one", new int(1), 0);
    QCOMPARE(cache.totalCost(), 0);

    cache.insert("two", new int(2), 1);
    QCOMPARE(cache.totalCost(), 1);

    cache.insert("three", new int(3), 2);
    QCOMPARE(cache.totalCost(), 3);

    cache.insert("four", new int(4), 10000);
    QCOMPARE(cache.totalCost(), 3);
    QVERIFY(!cache.contains("four"));

    cache.insert("five", new int(5), -5);
    QCOMPARE(cache.totalCost(), -2);

    cache.insert("six", new int(6), 101);
    QCOMPARE(cache.totalCost(), -2);

    cache.insert("seven", new int(7), 100);
    QCOMPARE(cache.totalCost(), 98);
    QCOMPARE(cache.size(), 5);

    cache.insert("eight", new int(8), 2);
    QCOMPARE(cache.totalCost(), 100);
    QCOMPARE(cache.size(), 6);
}

QIcon get_file_icon(const QString& content_type) {
  static QCache<QString, QIcon> cache;
  cache.setMaxCost(100);
  if (cache.contains(content_type)) return QIcon(*(cache.object(content_type)));
  QByteArray ba = content_type.toLocal8Bit();
  GIcon* gicon = g_content_type_get_icon(ba.constData());
  QStringList tried_names;
  if (G_IS_THEMED_ICON(gicon)) {
    const gchar * const * names = g_themed_icon_get_names(reinterpret_cast<GThemedIcon*>(gicon));
    if (names != 0) {
      int i = 0;
      while(names[i] != 0) {
        QString name = QString::fromLocal8Bit(names[i]);
        QIcon r = QIcon::fromTheme(name);
        if (r.isNull()) {
          tried_names << name;
        } else {
          cache.insert(content_type, new QIcon(r));
          g_object_unref(gicon);
          return r;
        }
        i++;
      }
    } else {
      qDebug() << "get_file_icon: empty or invalid result of g_themed_icon_get_names";
    }
  } else {
    qDebug() << "get_file_icon: gicon is not themed icon";
  }
  qDebug() << "get_file_icon(" << content_type << "): no valid names" << tried_names << "; returning null icon";
  cache.insert(content_type, new QIcon());
  g_object_unref(gicon);
  return QIcon();
}

void tst_QCache::axioms_on_key_type()
{
    QCache<KeyType, ValueType> foo;
    foo.setMaxCost(1);
    foo.clear();
    foo.insert(KeyType(123), new ValueType(123));
    foo.object(KeyType(123));
    foo.contains(KeyType(456));
    foo[KeyType(456)];
    foo.remove(KeyType(456));
    foo.remove(KeyType(123));
    foo.take(KeyType(789));
// If this fails, contact the maintaner
    QVERIFY(sizeof(QHash<int, int>) == sizeof(void *));
}

QString DateStringBuilder::getShortDate(const KDateTime &dateTime)
{
    if (!dateTime.isValid() || dateTime.isNull()) {
        return QString();
    }
    QDate currentDate = QDateTime().currentDateTime().date();
    if (currentDate.weekNumber() == dateTime.date().weekNumber() || currentDate.addDays(1) == dateTime.date()) { //this week or tomorrow (i.e. on sunday)
        return getDayName(dateTime);
    }
    if (currentDate.year() == dateTime.date().year()) { //this year
        //Micro optimization because this function showed up as hotspot
        static QCache<uint, QString> cache;
        uint hash = dateTime.date().month() ^ dateTime.date().day();
        if (!cache.contains(hash)) {
            cache.insert(hash, new QString(dateTime.toString("%d.%m")));
        }
        return *cache[hash];
    }
    return dateTime.toString("%d.%m.%Y");
}

void tst_QCache::contains()
{
    QCache<int, int> cache;
    QVERIFY(!cache.contains(0));
    QVERIFY(!cache.contains(1));

    cache.insert(1, new int(1), 1);
    QVERIFY(!cache.contains(0));
    QVERIFY(cache.contains(1));

    cache.remove(0);
    cache.remove(1);
    QVERIFY(!cache.contains(0));
    QVERIFY(!cache.contains(1));

    cache.insert(1, new int(1), 1);
    QVERIFY(!cache.contains(0));
    QVERIFY(cache.contains(1));

    cache.clear();
    QVERIFY(!cache.contains(0));
    QVERIFY(!cache.contains(1));
}

bool QGLBlurTextureCache::hasBlurTextureInfo(quint64 cacheKey) const
{
    return cache.contains(cacheKey);
}