Qt: does “new without delete” cause memory leaks with controls?

Question

I was looking at Qt example here:

and inside the constructor, they have:

 Window::Window()
 {
     editor = new QTextEdit();   // Memory leak?
     Q         


        

Answer 1

As of C++14 you can use the std::make_unique() convenience function template for creating an std::unique_ptr<> that has exclusive ownership of the widget. Then, at the moment of passing the widget to addLayout(), you make the smart pointer give up ownership by calling release():

auto buttonLayout = std::make_unique(); 
// ...
// an exception could be thrown here
// ...
layout->addLayout(buttonLayout.release());