shiboken2: AbstractMetaType: use QSharedData[Pointer]

Previously, shiboken2 kept AbstractMetaType by a raw pointer. The data
were copied numerous times by AbstractMetaType::copy() when adding the
inherited functions to a AbstractMetaClass or specializing templates,
sometimes with a bool flag indicating ownership.

To get rid of the copies and ownership issues, change the type
to be based on QSharedData[Pointer]. It can then be passed
around and treated like a C++ value type, with Qt sharing the
data when possible behind the scenes.

- Extract AbstractMetaType to a separate header/source
- Remove unused AbstractMetaType::setInstantiationInCpp()
- Remove unused member m_package
- Rewrite the comparison of AbstractMetaType which
  becomes relevant for checking/detaching to do a complete
  comparison. It was previously unused, intended for
  a different implementation of view types with special cases.
- Rework debug formatting
- Invalid meta types are indicated by the "Invalid" usage pattern
  instead of null pointers

Change-Id: Ic4b1feecafb4f0355f39e178c2703b104e45cf6c
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

1 files changed, 1 insertions, 1 deletions

diff --git a/sources/shiboken2/generator/shiboken2/headergenerator.h b/sources/shiboken2/generator/shiboken2/headergenerator.h
index 30ce06636..d02516b8d 100644
--- a/sources/shiboken2/generator/shiboken2/headergenerator.h
+++ b/sources/shiboken2/generator/shiboken2/headergenerator.h
@@ -57,7 +57,7 @@ private:
     void writeFunction(QTextStream &s, const AbstractMetaFunction *func);
     void writeSbkTypeFunction(QTextStream &s, const AbstractMetaEnum *cppEnum);
     void writeSbkTypeFunction(QTextStream &s, const AbstractMetaClass *cppClass);
-    void writeSbkTypeFunction(QTextStream &s, const AbstractMetaType *metaType);
+    void writeSbkTypeFunction(QTextStream &s, const AbstractMetaType &metaType);
     void writeTypeIndexValueLine(QTextStream &s, const TypeEntry *typeEntry);
     void writeTypeIndexValueLines(QTextStream &s, const AbstractMetaClass *metaClass);
     void writeProtectedEnumSurrogate(QTextStream &s, const AbstractMetaEnum *cppEnum);