TArray with custom class EXCEPTION_ACCESS_VIOLATION

Development Programming & Scripting C++
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1

Unreal show me line “TilePtr& tile = m_tiles[getTileIndex(pos)];” in TileBlock::getOrCreate()

TileBlock.h

#pragma once
#include "Tile.h"

class RPGONLINE_API TileBlock
{
public:
    TileBlock();

    const TilePtr& create(const Position& pos);
    const TilePtr& getOrCreate(const Position& pos);
    const TilePtr& get(const Position& pos) { return m_tiles[getTileIndex(pos)]; }
    void remove(const Position& pos) { m_tiles[getTileIndex(pos)] = nullptr; }

    uint getTileIndex(const Position& pos) { return ((pos.y % 32) * 32) + (pos.x % 32); }

    const TArray<TilePtr>& getTiles() const { return m_tiles; }

private:
    TArray<TilePtr> m_tiles;
};

TileBlock.cpp

#include "TileBlock.h"

TileBlock::TileBlock()
{
	g_logger.debug("TILEBLOCK CONSTRUCTOR");
	m_tiles.Empty();
	//m_tiles.SetNum(1024);
	m_tiles.Init(nullptr, 1024);
}

const TilePtr& TileBlock::create(const Position& pos)
{
	TilePtr& tile = m_tiles[getTileIndex(pos)];
	tile = TilePtr(new Tile(pos));
	g_logger.debug(FString::Printf(TEXT("Tile Created Index: %d, pos %d %d %d"), getTileIndex(pos), pos.x, pos.y, pos.z));
	return tile;
}

const TilePtr& TileBlock::getOrCreate(const Position& pos)
{
	TilePtr& tile = m_tiles[getTileIndex(pos)]; //LINE WITH ERROR
	if (!tile)
		tile = TilePtr(new Tile(pos));
	return tile;
}

Error appears when I call m_tiles
What I am doing wrong here?

2

You need to decorate your TArray with UPROPERTY otherwise it gets garbage-collected.