ATTRIBUTE_ACCESSORS Indicates an error indicating that the function definition was not found even though the macro was declared

Question

Using Visual Studio. We would like to implement health and mana through the ATTRIBUTE_ACCESSORS macro in Unreal Engine 5. It is said that a macro can be defined and used to use ATTRIBUTE_ACCESSORS, but even though it is defined, an error occurs that there is no function definition in the line containing ATTRIBUTE_ACCESSORS(UAuraAttributeSet, Data).

// AttributeSet.h
// Copyright Min Creater

#pragma once

#include "CoreMinimal.h"
#include "AttributeSet.h"
#include "AbilitySystemComponent.h"
#include "AuraAttributeSet.generated.h"

#define ATTRIBUTE_ACCESSORS(ClassName, PropertyName) \
    GAMEPLAYATTRIBUTE_PROPERTY_GETTER(ClassName, PropertyName) \
    GAMEPLAYATTRIBUTE_VALUE_GETTER(PropertyName) \
    GAMEPLAYATTRIBUTE_VALUE_SETTER(PropertyName) \
    GAMEPLAYATTRIBUTE_VALUE_INITTER(PropertyName)
/**
 * 
 */
UCLASS()
class AURA_API UAuraAttributeSet : public UAttributeSet
{
    GENERATED_BODY()

public:
    UAuraAttributeSet(); //속성
    virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;

    UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_Health, Category = "Vital Attributes")
    FGameplayAttributeData Health; //체력
    ATTRIBUTE_ACCESSORS(UAuraAttributeSet, Health);

    UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_MaxHealth, Category = "Vital Attributes")
    FGameplayAttributeData MaxHealth;
    ATTRIBUTE_ACCESSORS(UAuraAttributeSet, MaxHealth);

    UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_Mana, Category = "Vital Attributes")
    FGameplayAttributeData Mana; //마나
    ATTRIBUTE_ACCESSORS(UAuraAttributeSet, Mana);

    UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_MaxMana, Category = "Vital Attributes")
    FGameplayAttributeData MaxMana;
    ATTRIBUTE_ACCESSORS(UAuraAttributeSet, MaxMana);

    //BluepritnReadOnly - 엔진 내 블루프린트로 접근 

    /*
    * 새 속성을 추가하기 위한 단계.
    * 1. 변수 선언(OnRep_Health), 복제, 담당자 정의(UFUNCTION)
    * 2. 이를 정의하고 알림 매크로(cpp. GAMEPLAYATTRIBUTE_REPNOTIFY) 추가 
    * 3. 복제 변수를 추가하여(DOREPLIFETIME_CONDITION_NOTIFY, 조건 없음) 복제 값을 얻음
    * 
    * 이러한 모든 단계를 Attribute를 사용하고 추가하기 위한 상용구로 칭함. 
    * 속성이 필요한 모든 작업에는 이와 같은 상용구 단계를 따라야 한다. 
    */

    UFUNCTION()
    void OnRep_Health(const FGameplayAttributeData& OldHealth) const;

    UFUNCTION()
    void OnRep_MaxHealth(const FGameplayAttributeData& OldMaxHealth) const;

    UFUNCTION()
    void OnRep_Mana(const FGameplayAttributeData& OldMana) const;

    UFUNCTION()
    void OnRep_MaxMana(const FGameplayAttributeData& OldMaxMana) const;
};

// AttributeSet.cpp
// Copyright Min Creater


#include "AbilitySystem/AuraAttributeSet.h"
#include "Net/UnrealNetwork.h"



UAuraAttributeSet::UAuraAttributeSet()
{
    InitHealth(100.f);
    InitMaxHealth(100.f);
    InitMana(50.f);
    InitMaxMana(50.f);
}

void UAuraAttributeSet::GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const
{
    Super::GetLifetimeReplicatedProps(OutLifetimeProps);

    DOREPLIFETIME_CONDITION_NOTIFY(UAuraAttributeSet, Health, COND_None, REPNOTIFY_Always);
    DOREPLIFETIME_CONDITION_NOTIFY(UAuraAttributeSet, MaxHealth, COND_None, REPNOTIFY_Always);
    DOREPLIFETIME_CONDITION_NOTIFY(UAuraAttributeSet, Mana, COND_None, REPNOTIFY_Always);
    DOREPLIFETIME_CONDITION_NOTIFY(UAuraAttributeSet, MaxMana, COND_None, REPNOTIFY_Always);
    //복제하려는 모든 항목에 필요한 복제할 상태를 등록, 아무 조건 없이. 

}

void UAuraAttributeSet::OnRep_Health(const FGameplayAttributeData& OldHealth) const
{
    GAMEPLAYATTRIBUTE_REPNOTIFY(UAuraAttributeSet, Health, OldHealth);
}

void UAuraAttributeSet::OnRep_MaxHealth(const FGameplayAttributeData& OldMaxHealth) const
{
    GAMEPLAYATTRIBUTE_REPNOTIFY(UAuraAttributeSet, MaxHealth, OldMaxHealth);
}

void UAuraAttributeSet::OnRep_Mana(const FGameplayAttributeData& OldMana) const
{
    GAMEPLAYATTRIBUTE_REPNOTIFY(UAuraAttributeSet, Mana, OldMana);
}

void UAuraAttributeSet::OnRep_MaxMana(const FGameplayAttributeData& OldMaxMana) const
{
    GAMEPLAYATTRIBUTE_REPNOTIFY(UAuraAttributeSet, MaxMana, OldMaxMana);
}

// Build.cs
// Copyright Min Creater

using UnrealBuildTool;

public class Aura : ModuleRules
{
    public Aura(ReadOnlyTargetRules Target) : base(Target)
    {
        PCHUsage = PCHUsageMode.UseExplicitOrSharedPCHs;
    
        PublicDependencyModuleNames.AddRange(new string[] { "Core", "CoreUObject", "Engine", "InputCore", "EnhancedInput", "GameplayAbilities" });

        PrivateDependencyModuleNames.AddRange(new string[] { "GameplayTags", "GameplayTasks" , "NavigationSystem", "Niagara", "AIModule" });

        // Uncomment if you are using Slate UI
        // PrivateDependencyModuleNames.AddRange(new string[] { "Slate", "SlateCore" });
        
        // Uncomment if you are using online features
        // PrivateDependencyModuleNames.Add("OnlineSubsystem");

        // To include OnlineSubsystemSteam, add it to the plugins section in your uproject file with the Enabled attribute set to true
    }
}

I rewrote build.cs, rewrote AttributeSet.h, and AttributeSet.cpp files, built it, regenerated the visual studio project, debugged it, and ran the engine in debug mode, but the engine stopped and crashed.

Answer 1

Just get solved this right now. After you've copied macros, you are going to use ATTRIBUTE_ACCESSORS(Attrib_set, StatName)

So just don't put the semicolon at the end, so VS doesn’t take it as a function.

ATTRIBUTE_ACCESSORS(UAuraAttributeSet, Health);

ATTRIBUTE_ACCESSORS(UAuraAttributeSet, Health) // -- like that

Answer 2

Ah yes, I as well had this problem, but alas

I've found the answer

https://forums.unrealengine.com/t/gaplay-abities-attributeset-attribute-accessors/451597

Don't type it out, it's a Macro built by Epic and it basically transforms your ability code into something else so copy and paste this directly from the Epic Forums

• #define ATTRIBUTE_ACCESSORS(ClassName, PropertyName) \
• GAMEPLAYATTRIBUTE_PROPERTY_GETTER(ClassName, PropertyName) \
• GAMEPLAYATTRIBUTE_VALUE_GETTER(PropertyName) \
• GAMEPLAYATTRIBUTE_VALUE_SETTER(PropertyName) \
• GAMEPLAYATTRIBUTE_VALUE_INITTER(PropertyName)

Then your red squiggly on the A should turn into all green squigglies and you should be all set to go