Forward declare

Development Platform & Builds
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1

Hallo) I’ve tried to make forward declare, but it doesn’t work.
Here’s changes in the code (There’s normal building without them):

class APickupItem; // forward declare the APickupItem class,
				   // since it will be "mentioned" in a member function
decl below

…and this’s error message

...\prototip1Character.h(4):fatal error C1083: prototip1Character.generated.h: No such file or directory
...prototip1Character.h(4):fatal error C1083: prototip1Character.generated.h: No such file or directory
2

Could you please include prototip1Character.h as that might have a code error in it. The error doesn’t appear to be related to the forward declaration.

3

Here it is

    // Copyright 1998-2016 Epic Games, Inc. All Rights Reserved.
    #pragma once
    #include "GameFramework/Character.h"
    #include "prototip1Character.generated.h"
    
    class UInputComponent;
    class APickupItem; // forward declare the APickupItem class,
    				   // since it will be "mentioned" in a member function
    decl below
    UCLASS(config=Game)
    class Aprototip1Character : public ACharacter
    {
    	GENERATED_BODY()
    
    	TMap<FString, int> Backpack;
    	
    	TMap<FString, UTexture2D*> Icons;
    	
    	
    	void Pickup(APickupItem *item);
    	/** Pawn mesh: 1st person view (arms; seen only by self) */
    	UPROPERTY(VisibleDefaultsOnly, Category=Mesh)
    	class USkeletalMeshComponent* Mesh1P;
    
    	/** Gun mesh: 1st person view (seen only by self) */
    	UPROPERTY(VisibleDefaultsOnly, Category = Mesh)
    	class USkeletalMeshComponent* FP_Gun;
    
    	/** Location on gun mesh where projectiles should spawn. */
    	UPROPERTY(VisibleDefaultsOnly, Category = Mesh)
    	class USceneComponent* FP_MuzzleLocation;
    
    	/** First person camera */
    	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = Camera, meta = (AllowPrivateAccess = "true"))
    	class UCameraComponent* FirstPersonCameraComponent;
    public:
    	Aprototip1Character();
    
    	virtual void BeginPlay();
    	
    	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
    	bool inventoryShowing;
    	/*... Here is some function and variables (they are OK (the code has alredy worked with them))...*/ 
    
    
    	/** Base turn rate, in deg/sec. Other scaling may affect final turn rate. */
    	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category=Camera)
    	float BaseTurnRate;
    
    	/** Base look up/down rate, in deg/sec. Other scaling may affect final rate. */
    	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category=Camera)
    	float BaseLookUpRate;
    
    	/** Gun muzzle's offset from the characters location */
    	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Gameplay)
    	FVector GunOffset;
    
    	/** Projectile class to spawn */
    	UPROPERTY(EditDefaultsOnly, Category=Projectile)
    	TSubclassOf<class Aprototip1Projectile> ProjectileClass;
    
    	/** Sound to play each time we fire */
    	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category=Gameplay)
    	class USoundBase* FireSound;
    
    	/** AnimMontage to play each time we fire */
    	UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = Gameplay)
    	class UAnimMontage* FireAnimation;
    protected:
    	
    	/** Fires a projectile. */
    	void OnFire();
    
    	/** Handles moving forward/backward */
    	void MoveForward(float Val);
    
    	/** Handles stafing movement, left and right */
    	void MoveRight(float Val);
    
    	/**
    	 * Called via input to turn at a given rate.
    	 * @param Rate	This is a normalized rate, i.e. 1.0 means 100% of desired turn rate
    	 */
    	void TurnAtRate(float Rate);
    
    	/**
    	 * Called via input to turn look up/down at a given rate.
    	 * @param Rate	This is a normalized rate, i.e. 1.0 means 100% of desired turn rate
    	 */
    	void LookUpAtRate(float Rate);
    
    	struct TouchData
    	{
    		TouchData() { bIsPressed = false;Location=FVector::ZeroVector;}
    		bool bIsPressed;
    		ETouchIndex::Type FingerIndex;
    		FVector Location;
    		bool bMoved;
    	};
    	void BeginTouch(const ETouchIndex::Type FingerIndex, const FVector Location);
    	void EndTouch(const ETouchIndex::Type FingerIndex, const FVector Location);
    	void TouchUpdate(const ETouchIndex::Type FingerIndex, const FVector Location);
    	TouchData	TouchItem;
    	
    protected:
    	// APawn interface
    	virtual void SetupPlayerInputComponent(UInputComponent* InputComponent) override;
    	// End of APawn interface
    
    	/* 
    	 * Configures input for touchscreen devices if there is a valid touch interface for doing so 
    	 *
    	 * @param	InputComponent	The input component pointer to bind controls to
    	 * @returns true if touch controls were enabled.
    	 */
    	bool EnableTouchscreenMovement(UInputComponent* InputComponent);
    
    public:
    	/** Returns Mesh1P subobject **/
    	FORCEINLINE class USkeletalMeshComponent* GetMesh1P() const { return Mesh1P; }
    	/** Returns FirstPersonCameraComponent subobject **/
    	FORCEINLINE class UCameraComponent* GetFirstPersonCameraComponent() const { return FirstPersonCameraComponent; }
    
    };
4

Hi Volkoshkursk,

The above error is caused by decl below above the UCLASS declaration.

Cheers,

5

I try to edit it

Class 'APickupItem' must inherit UObject or a UObject-derived class	prototip1	...\prototip1Character.h	1

and there’re changes in the code

UCLASS()
class APickupItem; // forward declare the APickupItem class,
				   // since it will be "mentioned" in a member function
decl below

class Aprototip1Character : public ACharacter

Unfortunately, I don’t understand how to make inheritance

6

My apologies. I should have been clear. You need to REMOVE the line decl below above the UCLASS declaration of Aprototip1Character as that isn’t valid C++. The location of the UCLASS declaration was correct previously.