[UE4]OnComponentBeginOverlap.AddDynamic 的编译错误

以 Character 类为例，假设有 PacManCharacter 派生自 Character类
首先在 PacManCharacter.h 头文件中添加碰撞函数的声明：

OnCollision 为自定义的碰撞函数，名称可以任意，但参数形式必须满足以下条件

UFUNCTION()
void OnCollision(class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult);  

然后在 PacManCharacter.cpp 文件中的 SetupPlayerInputComponent 函数中添加绑定函数：

GetCapsuleComponent()->OnComponentBeginOverlap.AddDynamic(this, &PacManCharacter::OnCollision);  

碰撞函数的实现：

void PacManCharacter::OnCollision(class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
　　GEngine->AddOnScreenDebugMessage(, 1.0f, FColor::Red, TEXT("PacMan ! "));
}  

但是以上是老版本的 UE4 支持的格式，编译会报参数类型不匹配的错误

error C2664: 'void TBaseDynamicMulticastDelegate::__Internal_AddDynamic(UserClass *,void (__cdecl AItem::* )(UPrimitiveComponent *,AActor *,UPrimitiveComponent *,int32,bool,const FHitResult &),FName)':
 cannot convert argument  from 'void (__cdecl AItem::* )(AActor *,UPrimitiveComponent *,int32,bool,const FHitResult &)'
to
'void (__cdecl AItem::* )(UPrimitiveComponent *,AActor *,UPrimitiveComponent *,int32,bool,const FHitResult &)'  

新版本的 UE4 应该对碰撞函数进行如下声明和定义：

UFUNCTION()
void OnCollision(class UPrimitiveComponent* HitComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult & SweepResult);  

void PacManCharacter::OnCollision(class UPrimitiveComponent* HitComp, class AActor* OtherActor, class UPrimitiveComponent* OtherComp, int32 OtherBodyIndex, bool bFromSweep, const FHitResult& SweepResult)
{
　　GEngine->AddOnScreenDebugMessage(, 1.0f, FColor::Red, TEXT("PacMan ! "));
}  

即增加了第一个参数  class UPrimitiveComponent* HitComp