c++ - Is using "this" in contructor's initialization list specificly dangerous with Qt? -

i need reliable information "this" subject:

class myclass, public qwidget { public:     myclass( qwidget * parent = null )          :qwidget( parent ),          mpanotherwidget( new qwidget( ) ){}; private:     qwidget * mpanotherwidget; }; 

of course, calling virtual functions in contructor or initialization list bad idea. question is: can code

mpanotherwidget( new qwidget( ) ) 

lead undefined behavior?! , if so: why ?

please quote sources if can! thanks!

it depends on qwidget pointer given. fine pass around reference or pointer half-constructed object long called code not access underlying object. need documentation of qwidget know whether touches object or stores pointer.

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in particular case of qt, reading documentation, calling constructor of qwidget, argument of type qwidget*, , this used cast base pointer. obtaining pointer base guaranteed in 12.7/3 requirement conversion the construction of x , construction of of direct or indirect bases directly or indirectly derive b shall have started. pointer passed qwidget constructor may use in way wants, since constructor base qwidget has completed before constructor mpanotherwidget starts.