Remove QMetaType::unregisterType().

The function hasn't been working properly. It was not well tested, for
example it is undefined how QVariant should behave if it contains an
instance of an unregistered type.

Concept of unregistering types was inspired by plug-in system, but in
most supported platforms we do not unload plug-ins.

Idea of type unregistering may block optimizations in meta object
system, because it would be not possible to cache a type id.
QMetaType::type() could return different ids for the same name.

Currently QMetaType::unregisterType() is not used in Qt.

Change-Id: I878b6e8d91de99f9bcefeab73af2e2ba0bd0cba0
Reviewed-by: Prasanth Ullattil <prasanth.ullattil@nokia.com>
Reviewed-by: Bradley T. Hughes <bradley.hughes@nokia.com>
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>

1 files changed, 0 insertions, 23 deletions

diff --git a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
index be13b39e7e..ca2964d3e2 100644
--- a/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
+++ b/tests/auto/corelib/kernel/qmetatype/tst_qmetatype.cpp
@@ -87,7 +87,6 @@ private slots:
     void typedefs();
     void isRegistered_data();
     void isRegistered();
-    void unregisterType();
     void registerStreamBuiltin();
     void automaticTemplateRegistration();
 };
@@ -857,28 +856,6 @@ void tst_QMetaType::isRegistered()
     QCOMPARE(QMetaType::isRegistered(typeId), registered);
 }
 
-class RegUnreg
-{
-public:
-    RegUnreg() {};
-    RegUnreg(const RegUnreg &) {};
-    ~RegUnreg() {};
-};
-
-void tst_QMetaType::unregisterType()
-{
-    // cannot unregister standard types
-    int typeId = qRegisterMetaType<QList<QVariant> >("QList<QVariant>");
-    QCOMPARE(QMetaType::isRegistered(typeId), true);
-    QMetaType::unregisterType("QList<QVariant>");
-    QCOMPARE(QMetaType::isRegistered(typeId), true);
-    // allow unregister user types
-    typeId = qRegisterMetaType<RegUnreg>("RegUnreg");
-    QCOMPARE(QMetaType::isRegistered(typeId), true);
-    QMetaType::unregisterType("RegUnreg");
-    QCOMPARE(QMetaType::isRegistered(typeId), false);
-}
-
 void tst_QMetaType::registerStreamBuiltin()
 {
     //should not crash;