[Unreal Engine 4 C++] Interface C++에서 구현하기

 Interface 함수를 C++에서 구현할 때 해당 함수를 C++에서만 사용하는 방법과 블루프린트에서도 사용하는 방법 2가지로 만들 수 있다.

 

---

 C++ 에서만 사용할 경우

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreEngine.h"
#include "UObject/Interface.h"
#include "Interface_Character.generated.h"

UINTERFACE(MinimalAPI)
class UInterface_Character : public UInterface
{
	GENERATED_BODY()
};

class PROJECTCE_API IInterface_Character
{
	GENERATED_BODY()

public:
	virtual void SetOnAttack(bool bFlag);
};

<Interface_Character.h>

 

// Fill out your copyright notice in the Description page of Project Settings.


#include "Interface_Character.h"

// Add default functionality here for any IInterface_PCEPlayerCharacter functions that are not pure virtual.

void IInterface_Character::SetOnAttack(bool bFlag)
{

}

<Interface_Character.cpp>

 

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreEngine.h"
#include "Interface_Character.h"
#include "PlayerCharacter.generated.h"

class PROJECTCE_API APlayerCharacter : public IInterface_Character
{
	GENERATED_BODY()

public:
	virtual void SetOnAttack(bool bFlag) override;
    
      bool bOnAttack;
};

<PlayerCharacter.h>

 

// Fill out your copyright notice in the Description page of Project Settings.


#include "PlayerCharacter.h"

void APlayerCharacter::SetOnattack(bool bFlag)
{
	bOnAttack = bFlag;
}

<PlayerCharacter.cpp>

 

AActor* Character = GetOwner();
IInterface_PlayerCharacter* Interface = Cast<IInterface_PlayerCharacter>(Character);
if(Interface != nullptr)
{
	Interface->SetOnAttack(false);
}

<호출 방법>

 

---

블루프린트에서도 사용할 경우

 

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreEngine.h"
#include "UObject/Interface.h"
#include "Interface_Character.generated.h"

UINTERFACE(MinimalAPI)
class UInterface_Character : public UInterface
{
	GENERATED_BODY()
};

class PROJECTCE_API IInterface_Character
{
	GENERATED_BODY()

public:
	UFUNCTION(BlueprintCallable, BlueprintNativeEvent)
	void SetOnAttack(bool bFlag);
};

<Interface_Character.h>

 

 cpp 파일은 구현하지 않아도 된다.

<Interface_Character.cpp>

 

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "CoreEngine.h"
#include "Interface_Character.h"
#include "PlayerCharacter.generated.h"

class PROJECTCE_API APlayerCharacter : public IInterface_Character
{
	GENERATED_BODY()

public:
	virtual void SetOnAttack_Implementation(bool bFlag) override;
    
	bool bOnAttack;
};

<PlayerCharacter.h>

 

// Fill out your copyright notice in the Description page of Project Settings.


#include "PlayerCharacter.h"

// _Implementation을 붙인 함수를 사용한다.
void APlayerCharacter::SetOnAttack_Implementation(bool bFlag)
{
	bOnAttack = bFlag;
}

<PlayerCharacter.cpp>

 

AActor* Character = GetOwner();

if (Character->GetClass()->ImplementsInterface(UInterface_PlayerCharacter::StaticClass()))
{
	IInterface_PlayerCharacter::Execute_SetOnAttack(Character, false);
}

<호출 방법>