Add a qHash for QUuid

Change-Id: Ib0d9a765b8db3b34aa20d510de501c72a54cacbe Reviewed-on: http://codereview.qt.nokia.com/1743 Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com> Reviewed-by: Xizhi Zhu <xizhi.zhu@nokia.com> Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
qt · Jul 19, 2011 · 55d68a1 · 55d68a1
1 parent d5bdbd7
commit 55d68a1
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diff --git a/src/corelib/plugin/quuid.cpp b/src/corelib/plugin/quuid.cpp
@@ -927,4 +927,15 @@ QUuid QUuid::createUuid()
     guid; otherwise returns false.
 */
 
+/**
+    Returns a hash of the QUuid
+ */
+uint qHash(const QUuid &uuid)
+{
+    return uuid.data1 ^ uuid.data2 ^ (uuid.data3 << 16)
+     ^ ((uuid.data4[0] << 24) | (uuid.data4[1] << 16) | (uuid.data4[2] << 8) | uuid.data4[3])
+     ^ ((uuid.data4[4] << 24) | (uuid.data4[5] << 16) | (uuid.data4[6] << 8) | uuid.data4[7]);
+}
+
+
 QT_END_NAMESPACE
diff --git a/src/corelib/plugin/quuid.h b/src/corelib/plugin/quuid.h
@@ -189,6 +189,8 @@ Q_CORE_EXPORT QDataStream &operator<<(QDataStream &, const QUuid &);
 Q_CORE_EXPORT QDataStream &operator>>(QDataStream &, QUuid &);
 #endif
 
+Q_CORE_EXPORT uint qHash(const QUuid &uuid);
+
 QT_END_NAMESPACE
 
 QT_END_HEADER

diff --git a/tests/auto/quuid/tst_quuid.cpp b/tests/auto/quuid/tst_quuid.cpp
@@ -82,6 +82,8 @@ private slots:
     void threadUniqueness();
     void processUniqueness();
 
+    void hash();
+
 public:
     // Variables
     QUuid uuidA;
@@ -322,5 +324,14 @@ void tst_QUuid::processUniqueness()
     QVERIFY(processOneOutput != processTwoOutput);
 }
 
+void tst_QUuid::hash()
+{
+    uint h = qHash(uuidA);
+    QCOMPARE(qHash(uuidA), h);
+    QCOMPARE(qHash(QUuid(uuidA.toString())), h);
+}
+
+
+
 QTEST_MAIN(tst_QUuid)
 #include "tst_quuid.moc"