May 12, 2014  Hi! I'm having trouble compiling both QMC2 and MAME (on a LFS 7.5 host). Code: moc -v Code: Qt Meta Object Compiler version 63 (Qt 4.8.5) When I type. Signal and Slot for communication between objects (which are the main reasons to use the META OBJECT SYSTEM), other META OBJECT CODE the QObject implements several functions:. Function className - Returns the string name of the class running. C + + compiler for run-time type information (RTTI) support is not required.

Meta Object System is a part of Qt framework core provided to support Qt extensions to C++ like signals/slots for inter-object communication, run-time type information, and the dynamic property system.^[1]

Architecture[edit]

The Meta object system consists of 3 things: QObject class, Q_OBJECT macro and a tool called moc (Meta-Object Compiler). QObject is the base class for all Qt classes, Q_OBJECT macro is used to enable meta-object features in classes and finally moc is a preprocessor that changes Q_OBJECT macro instances to C++source code to enable meta object system mechanism in the class in which it is used.^[2]

Adi soundmax audio driver for windows 7. Using the meta object system has brought some criticism. In Qt documentation, several reasons have been given for the use of the meta object system, including benefits of code generation, dynamism of GUIs, automatic binding to scripting languages, not adding limitations and also reasonable performance in signal/slot implementation with moc.^[3] There are some efforts to make Qt needless of a preprocessor. These efforts include re-implementing Qt moc using libclang.^[4]

References[edit]

1. ^'The Meta-Object System - QtCore 5.1'. Qt Project. 2013-07-04. Retrieved 2013-07-04.
2. ^'Using the Meta-Object Compiler (moc)'. Qt Project. 2013-07-04. Retrieved 2013-07-04.
3. ^'Why Does Qt Use Moc for Signals and Slots?'. Qt Project. 2013-07-04. Retrieved 2013-07-04.
4. ^'Re-implementing Qt moc using libclang'. Olivier Goffart. 2013-07-04. Retrieved 2013-07-04.