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Dynamic allocation in QT: why "delete" operator in openglwindow example?
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I'm new in QT and was trying to figure out how the dynamic allocation works. I was reviewing the OpenGL Window Example, and noticed that:
- One of the class members for OpenGLWindow class -
m_device *QOpenGLPaintDeviceis allocated dynamically; in the destructor the memory is freed by callingdelete - There is another class member
QOpenGLContext *m_contextwhich is allocated dynamically as well; yet it is not freed in the destructor.
I was wondering if anyone could explain me why is it so? Why in this particular example
QOpenGLPaintDeviceis chosen to be destroyed andQOpenGLContext- not? - One of the class members for OpenGLWindow class -
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hi , many items in Qt are inserted into
containers or a parent and it will take ownership of the
object.
Like buttons you insert into a window. They will be deleted with the Window.
so most likely the creation of the m_context assigns it to a parent and it will be deleted with that.
m_context = new QOpenGLContext(this);
this being the window.
