Why can't I add a struct element to TArray

Development Programming & Scripting
1

I have a struct which I want to contain the class type and the category of the pickup item, here is the struct declaration

  USTRUCT()
    struct FEquipmentSlot
    {
    	GENERATED_BODY()
    
    	UPROPERTY()
    	TSubclassOf<APickupItem> EquipmentClass;
    
    	UPROPERTY()
    	PickupItemCategory EquipmentCategory;

        //default constructor
    	FEquipmentSlot()
    	{
    		EquipmentClass = APickupItem::StaticClass();
    		EquipmentCategory = PickupItemCategory::NONE;
    	}

        //constructor
    	FEquipmentSlot(TSubclassOf<APickupItem> Class,
                       PickupItemCategory Category)
    	{
    		EquipmentClass = Class;
    		EquipmentCategory = Category;
    	}
    };

Inside the UEquipmentComponent class, I declare a TArray to store the struct and a function to accept two parameters and use these parameters to construct the struct and add it to TArray

.h

    UCLASS( ClassGroup=(Custom), meta=(BlueprintSpawnableComponent) )
    class PIXELGAME_API UEquipmentComponent : public UActorComponent
    {
    protected:
    	UPROPERTY()
    	TArray<FEquipmentSlot> EquipmentSlots;
    	
    public:
    	UFUNCTION()
    	void AddEquipmentSlot(TSubclassOf<APickupItem> PickupItemClass, 
                              PickupItemCategory Category);
    };

.cpp

void UEquipmentComponent::AddEquipmentSlot(TSubclassOf<APickupItem> PickupItemClass, 
                                           PickupItemCategory Category)
{
    	EquipmentSlots.Add(FEquipmentSlot(Class, Category));
}

So here is the problem. When I call the function, I just want to add a struct to TArray but the editor will crash. and here is the crash report

LoginId:03f47e504a2eb5f8da7ac29cdd75db63
EpicAccountId:76d5fa6cc5884994b61338ec5bfe3a49

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0x000000b8

UE4Editor_PixelGame_0104!UEquipmentComponent::AddEquipmentSlot() [E:\UnrealProjects\PixelGame\Source\PixelGame\Components\EquipmentComponent.cpp:80]
UE4Editor_PixelGame_0104!ASword::Interact() [E:\UnrealProjects\PixelGame\Source\PixelGame\Items\Sword.cpp:26]
UE4Editor_PixelGame_0104!APixelGameCharacter::Interact() [E:\UnrealProjects\PixelGame\Source\PixelGame\Character\PixelGameCharacter.cpp:268]
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Core
UE4Editor_Core
UE4Editor_Core
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_UnrealEd
UE4Editor_UnrealEd
UE4Editor
UE4Editor
UE4Editor
UE4Editor
UE4Editor
kernel32
ntdll

I’m new to UE4 c++, and I search many answers but seems there is no right answer for this problem. I was stuck for
two days and I couldn’t find an answer. Can anybody save me, please? Any suggestion will be very very very helpful.

2

Use

GENERATED_USTRUCT_BODY() in your struct instead of GENERATED_BODY()

Second

Class is something redicilous while add slot below, didnt it? It should be PickUpItemClass

void UEquipmentComponent::AddEquipmentSlot(TSubclassOf<APickupItem> PickupItemClass, 
                                            PickupItemCategory Category)
 {
         EquipmentSlots.Add(FEquipmentSlot(PickUpItemClass, Category));
 }

Rather than using `add`, try with `findoradd`. Anndd
Code more carefully :)
3

Thank you so much for reminding me so many things. I will be more careful when I’m coding :))

4

Its good to help you. But always upvote and mark as answer to help others to find answer and motivating people who is typing answers dear @luuuuyang