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AddViewportWidgetContent(SNew gives error "'MakeTDecl': no matching overloaded function found"

I have minimal test project for a menu from the forum where the new class SMainMenu is derived from SCompoundWidget.

This is the header of the class:

 #pragma once

 #include "Slate.h"
 
 class SMainMenu : public SCompoundWidget
 {
 public:
     SLATE_BEGIN_ARGS(SMainMenu)
     {}
     SLATE_END_ARGS()
 
     // Constructor for slate widgets
     void Construct(const  FArguments& InArgs);
 
 private:
 
     //Start  button callback 
     FReply StartBtnClicked();
 
    [...]
 
     //Function to Create Menu 
     TSharedRef<SWidget> MyMenu();
 };

My HUD class has a member variable MyUIWidget. In my HUD cpp I use it like this:

 MyUIWidget = SNew(SMainMenu); 
 GEngine->GameViewport->AddViewportWidgetContent(SNew(MyUIWidget.ToSharedRef() ) );
 MyUIWidget->SetVisibility(EVisibility::Visible);

This gives me the error:

 error C2672: 'MakeTDecl': no matching overloaded function found
 error C2974: 'MakeTDecl': invalid template argument for 'WidgetType', type expected

If I use instead

 GEngine->GameViewport->AddViewportWidgetContent(MyUIWidget.ToSharedRef());

It seems to work. I get a GUI. Not really tested for further problems.

Now my questions:

  1. Is the second version without error the correct version and the API documentation is wrong? (I don't think so, to be honest)

  2. If the first version - the one with the error - is the correct one, what is the meaning of that error? How do I fix this? And why?

Product Version: UE 4.17
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asked Sep 07 '17 at 07:48 PM in C++ Programming

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BugSwat
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1 answer: sort voted first

I found my answer in the "Strategy Game", the sample project we get for free.

 GEngine->GameViewport->AddViewportWidgetContent(SNew(SWeakWidget).PossiblyNullContent(MyUIWidget.ToSharedRef() ) );
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answered Sep 08 '17 at 01:09 PM

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BugSwat
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