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Error: C2084 Already has a body


I am trying to spawn in a blueprint via c++. And I have a problem with the class. When I compile it says that AA_MainGame::AA_MainGame(const class FObjectInitializer& PCIP) already has a body. I read somewhere that this means that I've probably included the file to much. I've read this post on stackoverflow: http://stackoverflow.com/questions/21080453/error-c2084-function-already-has-a-body and the article about header guards, and I do understand the concept but I do not know how to apply it to my own code.


 // Fill out your copyright notice in the Description page of Project Settings.
 #pragma once
 #include "GameFramework/Actor.h"
 #include "A_MainGame.generated.h"
 class ROCKETGAME_API AA_MainGame : public AActor
         virtual void BeginPlay() override;
         TSubclassOf<AA_MainGame> BlueprintVar; // YourClass is the base class that your blueprint uses


 // Fill out your copyright notice in the Description page of Project Settings.
 #include "RocketGame.h"
 #include "A_MainGame.h"
 #include "Engine.h"
 AA_MainGame::AA_MainGame(const class FObjectInitializer& PCIP)
     : Super(PCIP)
     // Spawning the blueprint into the level
     static ConstructorHelpers::FObjectFinder<UBlueprint> BP_MainGame(TEXT("Blueprint'/Game/Blueprints/BP_MainGame.BP_MainGame'"));
     if (BP_MainGame.Object) {
         BlueprintVar = (UClass*)BP_MainGame.Object->GeneratedClass;
 void AA_MainGame::BeginPlay()
     UWorld* const World = GetWorld(); // get a reference to the world
     if (World) {
         // if world exists
         AA_MainGame* YC = World->SpawnActor<AA_MainGame>(BlueprintVar, FVector(0, 0, 0), FRotator(0, 0, 0));

I hope you can help me out :)

Thanks in advance,


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asked Jan 03 '15 at 06:12 PM in C++ Programming

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2 answers: sort voted first

Hi NeusAap,

The Problem here is that the 'GENERATED_BODY()' Macro aleready declares and defines 'AA_MainGame(const class FObjectInitializer& PCIP)' for you, so when you define it in your *.cpp you have two Definitions.

But the Macro does not declare & define the Constructor if you declare it yourself, so you have to add 'AA_MainGame(const class FObjectInitializer& PCIP);' in your header and it should work.


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answered Jan 03 '15 at 06:25 PM

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avatar image NeusAap Jan 03 '15 at 07:29 PM


Thanks for the quick respond. I get what you are trying to say, but when I try to apply it, I can not find out where to put it.

For me, it sounds the most logical to add it after: class ROCKETGAME_API AA_MainGame : public AActor. But that does not work, any other spot neither. Where do I place it?

Thanks again and sorry for the stupid questions :P


avatar image NoNoid Jan 03 '15 at 07:53 PM


I've placed just below the 'GENERATED_BODY()' Macro. After looking at my code I think that you should also make the Constructor public.

Does the Error change when you place the declaration in the Header?


avatar image NeusAap Jan 03 '15 at 08:01 PM

Aaaah, Amazing! It works now :)

Thanks allot! +1

avatar image NeusAap Jan 03 '15 at 08:03 PM

It will now boot up, but the blueprint doesn't spawn :P. Oh well... Atleast 1 error less to deal with :D Thanks again!

avatar image otto001 Sep 07 '15 at 07:02 PM

Worked for me too! I almost gave up, thumbs up for you NoNoid!

avatar image Two-faced Sep 03 '18 at 11:58 AM

Undying classic: a lot of mumbo-jumbo to implement a single blueprint overridden function...

avatar image Azdoph Nov 17 '18 at 03:14 AM

Maybe the purpose is just to learn how to developp in C++, even if the same can be achieved quicker with a blueprint. You should restrain from judging what people do or want to do, because you may not have a full understanding of their goals.

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answered Nov 19 '18 at 05:28 PM

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