How to garbage collect an Tarray of Ustructs

Development Programming & Scripting C++
1

Hey there,

I’m working on a tile based game in Unreal where my maps is stored by an array of Ustructs. I’ve read online that USTRUCTS don’t get garbage collected so I need to implement a custom Destroy function. However the structs are very simple and currently look like this:



UENUM(BlueprintType)
enum class ETerrain : uint8
{
  TE_Floors	UMETA(DisplayName = "Floors"),
  TE_Walls	UMETA(DisplayName = "Walls"),
  TE_Water	UMETA(DisplayName = "Water"),
  TE_ERROR	UMETA(DisplayName = "Error handler")
};


USTRUCT()
struct FCell
{
  GENERATED_USTRUCT_BODY()

  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings") int32 i;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings") int32 x;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings") int32 y;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings") ETerrain terrain;
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings / pathfinding") int32 pathfinding_ParentIndex;	// Previous step in Path
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings / pathfinding") float pathfinding_G;						// Steps taken to get to this Cell
  UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "Cell Settings / pathfinding") float pathfinding_H;            // Heuristics, distance to end in straight line

  FCell()
  {
    i = 0;
  }

  ~FCell()
  {

  }

  FCell(int32 a_index, int32 a_x, int32 a_y) : i(a_index), x(a_x), y(a_y)
  {
    terrain = ETerrain::TE_Floors;
  }

  FCell(int32 a_index, int32 a_x, int32 a_y, int32 a_parent) : i(a_index), x(a_x), y(a_y), pathfinding_ParentIndex(a_parent), pathfinding_G(0), pathfinding_H(0)
  {
    terrain = ETerrain::TE_Floors;
  }

};

What would I put in the Destroy function of this struct?

2

Ustructs are not managed by GC , only UObjects.

All what you need is to mark your struct as “USTRUCT()” and your array as “UPROPERTY()” , and then clear your array when you don(t need it any more

3

Just what I hoped to hear. Cheers mate