[Development] Notes on Metaobject & QML discussion @ QCS2016

[Thiago Macieira]

https://wiki.qt.io/QtCS2016_MetaObject

* qMetaType<const T>() == qMetaType<T>()
** Because QMetaObject::normalizedType("const T") == "T"
** Fix it
* Q_NAMESPACE
** Keep it in 5.8
** look into having it with multiple .h
** Q_ENUM_NS(OtherNamespace::Enum) or using Enum = OtherNamespace::Enum; is a 
good idea
* Direct property access via the qt_static_metacall
** qdbusxml2cpp
** Add property & setProperty to QDBusAbstractInterfaceBase
* Generated hash table
** properties, methods, enums
** hashing table needs to encode the type (Q_SIGNAL_CODE)
** perfect hashing doesn't help
** check if we can encode the hashing of the entire hierarchy
** "prelink" the class to its parent, recursively, but check at runtime

* For Qt6:
** metatype vs C++ RTTI
** qMetaType<T>() == &typeid(T)

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center