Cannot Forward Declare for a TSubClassOf or for a UPROPERTY() Member. How Can I Have Co-Dependency?

[Uulamock]

@Zeblote

• Make sure you’ve included CoreMinimal.h.
• Forward declarations in TSubclassOf works completely fine as long as you do not initialize it in the header.
• You can’t make a UPROPERTY to a struct pointer, and you can’t forward declare a struct property (as it would not know the size).

I have CoreMinimal.h included. You cannot create a pointer for TSubclassOf, so how are you getting it to completely work?

class AItem;

USTRUCT(BlueprintType)
struct FItemStruct
{
    GENERATED_BODY()

    UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Inventory")
        TSubclassOf<AItem> myItem; //Error, does not compile.   Cannot make it pointer either, error for being a pointer
};

[HR][/HR]

@BrUnO_XaVIeR

In case like that, because we have to deal with different compilers for multiple platforms, I create AItem_base to use it on both the Struct and as a base class for AItem.
Later I add templated auto casting routines for algorithms that must be members of the AItem class.

Omgosh duh… I forgot I could do that, Its been way too long since I’ve had to. Thanks! (This is my first time on these forums, idk how to, if I even can, accept your response as the answer)
[HR][/HR]

@Jambax

I’ve run into this quite often.

Although it seems counter-intuitive, I’ve found the forward declaration often works when including the SubclassOf.h header. Still not certain as to why.

#include "Templates/SubclassOf.h"

class USomeType;

You may know already, but if not - you can only forward-declare pointers to types.

Thank you, that’s very good to know! I’ll certainly keep that in mind for future reference.