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No known conversion from ‘unique_ptr<Wt::WContainerWidget>’ to ‘unique_ptr<Wt::WWidget>’

Added by Harm ​ almost 4 years ago

Hello,

I'm trying to pass a WContainerWidget to a WPopupWidget, but my compiler doesn't like this.

auto containerPtr = std::make_unique<Wt::WContainerWidget>();
auto popupPtr = std::make_unique<Wt::WPopupWidget>(containerPtr);

I'm getting

/usr/include/c++/10.2.0/bits/unique_ptr.h:962:30: error: no matching function for call to 'Wt::WPopupWidget::WPopupWidget(std::unique_ptr<Wt::WContainerWidget>&)'
  962 |     { return unique_ptr<_Tp>(new _Tp(std::forward<_Args>(__args)...)); }
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from WPopupWidget Test.cpp:27:
/usr/include/Wt/WPopupWidget.h:51:3: note: candidate: 'Wt::WPopupWidget::WPopupWidget(std::unique_ptr<Wt::WWidget>)'
   51 |   WPopupWidget(std::unique_ptr<WWidget> impl);
      |   ^~~~~~~~~~~~
/usr/include/Wt/WPopupWidget.h:51:41: note:   no known conversion for argument 1 from 'unique_ptr<Wt::WContainerWidget>' to 'unique_ptr<Wt::WWidget>'
   51 |   WPopupWidget(std::unique_ptr<WWidget> impl);
      |                ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~

How do I properly pass the WContainerWidget to the WPopupWidget?


Replies (2)

RE: No known conversion from ‘unique_ptr<Wt::WContainerWidget>’ to ‘unique_ptr<Wt::WWidget>’ - Added by Bruce Toll almost 4 years ago

Hi,

I think you may need to use std::move(containerPtr) as the argument.

RE: No known conversion from ‘unique_ptr<Wt::WContainerWidget>’ to ‘unique_ptr<Wt::WWidget>’ - Added by Harm ​ over 3 years ago

Bruce Toll wrote:

Hi,

I think you may need to use std::move(containerPtr) as the argument.

Ah yes this is the solution, my code compiles now. Thanks!

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