Compiles, but i have access violation error on the class' own property.

Development Programming & Scripting
,
1

Hi,

I have this class:

#include "CoreMinimal.h"
#include "Pathfinder.generated.h"

class UPathPoint;

UCLASS()
class MASS_API UPathfinder : public UObject
{
	GENERATED_BODY()
protected:
	UPROPERTY()
	UWorld* World;

public:
	UPROPERTY()
	TArray<AActor*> IgnoreActors;
	UPROPERTY()
	int MaxSteps = 10000;
	UPROPERTY()
	float StepSize = 25.;

	UPathfinder();
	~UPathfinder();

	UFUNCTION()
	void GetFlowMap(const FVector2D Start, const FVector2D End, TArray<UPathPoint*>& FlowMap);
	UFUNCTION()
	bool IsCanWalk(const FVector2D A, const FVector2D B);
	UFUNCTION()
	void BackTrack(TArray<UPathPoint*>& FlowMap, const FVector2D Target);
	UFUNCTION()
	bool IsFreeSpace(const FVector WorldPos)const;
	UFUNCTION()
	FVector2D GetClosestMoveablePointTo(const FVector2D From, const FVector2D Target)const;
};

It compiles, but I got Access Violation Error right at the start of the GetFlowMap function to the StepSize property.

this is the begining of the Pathfinder.cpp

#include "Pathfinder.h"
#include "Engine/World.h"
#include "Ext.h"
#include "PathPoint.h"
#include "Kismet/KismetSystemLibrary.h"

UPathfinder::UPathfinder()
{
	this->World = GetWorld();
}

UPathfinder::~UPathfinder()
{
}

void UPathfinder::GetFlowMap(const FVector2D Start, const FVector2D End, TArray<UPathPoint*>& FlowMap)
{	
	//Ceil positions
	FVector2D CeilStart = UExt::CenterToSize(Start, StepSize);
	FVector2D CeilEnd = UExt::CenterToSize(End,StepSize);

	//Check existing flow map for start location, if contains, then return, it is solved.
	if (FlowMap.ContainsByPredicate([CeilStart](const UPathPoint* Point) {return Point->Pos == CeilStart; })) {
		return;
	}

What did I wrong?

2

Is your this valid at that point? Check the step above this one, the function that makes call to GetFlowMap() seems doing it on invalid pointer

3

Thank you!

Indeed it was invalid. The this->World = GetWorld() in the constructor broke the constructor.