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POQt pure virtual function error
 

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    <p>I'm tring to create an interface with Qt to oblige any subclass to implements two main methods set and get title. But when I try to compile it I get a weird error message that says something about qt_check_for_QOBJECT_macro and staticMetaObject. In mainwindow.cpp I have to cast any page to the interface so I can rely on getter and setter methods. I don't see any other way to do that.</p> <p>this is my code:</p> <pre><code>//IPage.h #ifndef IPAGE_H #define IPAGE_H #include &lt;QString&gt; class IPage { public: virtual QString title()=0; virtual void setTitle(QString t)=0; }; #endif // IPAGE_H //buildings.h: #ifndef BUILDINGS_H #define BUILDINGS_H #include "IPage.h" #include &lt;QDialog&gt; class Buildings : public IPage, public QDialog { Q_OBJECT private: QString m_title; //stuff... }; #endif //buildings.cpp //stuff... void Buildings::setTitle(QString t) { m_title = t; setWindowTitle(t); } QString Buildings::title() { return m_title; } //mainwindow.cpp: QMdiSubWindow *MainWindow::findChild(const QString &amp;title) { foreach (QMdiSubWindow *window, mdiArea-&gt;subWindowList()) { IPage *child = qobject_cast&lt;IPage *&gt;(window-&gt;widget()); /*line 178*/ if (child-&gt;title() == title) return window; } return 0; } </code></pre> <p>and I get this error message when I compile my code:</p> <pre><code>In file included from c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qabstractanimation.h:45, from c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/QtCore:3, from c:\QtSDK\Desktop\Qt\4.8.1\mingw\include\QtGui/QtGui:3, from mainwindow.cpp:1: c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qobject.h: In function 'T qobject_cast(QObject*) [with T = IPage*]': mainwindow.cpp:178: instantiated from here c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qobject.h:378: error: 'class IPage' has no member named 'qt_check_for_QOBJECT_macro' c:\QtSDK\Desktop\Qt\4.8.1\mingw\include/QtCore/qobject.h:380: error: 'class IPage' has no member named 'staticMetaObject' mingw32-make.exe[1]: Leaving directory `D:/Dropbox/Programmi/Qt/Scadenziario' mingw32-make.exe[1]: *** [build/o/mainwindow.o] Error 1 mingw32-make.exe: *** [debug] Error 2 01:23:26: The process "C:\QtSDK\mingw\bin\mingw32-make.exe" exited with code 2. Error while building project scadenziario (target: Desktop) When executing build step 'Make' </code></pre> <p>I can't understand error message. I tried to google it, but I can't find any useful informations. Any help will be appreciated, thanks in advance.</p>
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