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Adding Unreal Interface Does Not Compile

When I an Unreal interface with the engine, I get the following compilation errors. I've also included the code that is generated by Unreal.

PickupInterface.h(11): error C2504: 'UInterface': base class undefined

PickupInterface.h(12): error C3646: 'Super': unknown override specifier

PickupInterface.h(12): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

PickupInterface.h(12): error C2614: 'UPickupInterface': illegal member initialization: 'Super' is not a base or member

PickupInterface.h(12): error C2440: 'return': cannot convert from 'UPickupInterface ' to 'UObject '

PickupInterface.h(12): note: Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast

 #pragma once
 #include "CoreMinimal.h"
 #include "PickupInterface.generated.h"
 // This class does not need to be modified.
 class UPickupInterface : public UInterface
 class TOMBWORLD_API IPickupInterface
     // Add interface functions to this class. This is the class that will be inherited to implement this interface.
Product Version: UE 4.18
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asked Mar 08 '18 at 04:59 PM in C++ Programming

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avatar image Atheist91 Mar 08 '18 at 08:50 PM

Hey there.

Have you tried including Interface.h?

 #include "UObject/Interface.h"

From what I see, it's not directly included in CoreMinimal.h. It might be somewhere deeper tho.

avatar image Cabewz Mar 08 '18 at 09:25 PM

I am incredibly confused. I added the Interface header, and it still failed. I added core minimal, same thing. Swapped the order and it worked. Then I removed both and it still compiles. I have no idea why, there is nothing else I changed. Thanks for the help, I do wish I knew what the issue was though.

avatar image Atheist91 Mar 08 '18 at 09:29 PM

It seemed kind of odd that you had this error in the first place. I can't remember if I ever had to include this header explicitly anywhere in my code actually. Maybe forcing VS to actually recompile your stuff fixed the issue. That's actually quite common solution. :P

avatar image killowatt Mar 20 '18 at 07:13 PM

I am not sure if I am experiencing the same thing but in a different form, but it maybe has to do with in what order you include the Interface header file, as it compiled fine until I moved the #include for the interface in my other classes to right before the .generated.h file. Not sure though

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