Hello!
I am experiencing some odd behavior with a custom template container class. What is happening is I fill this container with pointers to a class that inherits from AActor after I spawn them in the world like so
for (int32 x = -Size.X; x <= Size.X; x++) {
for (int32 y = -Size.Y; y <= Size.Y; y++) {
for (int32 z = -Size.Z; z <= Size.Z; z++) {
AMyClass *NewMyClass = (AMyClass*) GetWorld()->SpawnActor(MyClass::StaticClass());
NewMyClass->SetActorLocation(FVector(x, y, z));
Grid.Add(NewMyClass, x, y, z);
}
}
}
Then later on I attempt to call methods from MyClass.
for (int32 x = Grid.GetMinX(); x <= Grid.GetMaxX(); x++) {
for (int32 y = Grid.GetMinY(); y <= Grid.GetMaxY(); y++) {
for (int32 z = Grid.GetMinZ(); z <= Grid.GetMaxZ(); z++) {
MyClass *Class = Grid.Get(x, y, z);
if (!Class) { continue; } // If nothing here, skip it
if (Class->IsDirty()) {
Class->DoStuff();
}
}
}
}
But it seems when I call Grid.Get(…) I always retrieve a default version (without any properties initialized). I am still learning all the ins and outs of UE4 C++, but could this have something to do with UE4 garbage collector?
The header for my Grid class is as follows
#pragma once
#include <vector>
template <typename T>
class MYPROJECT_API TGrid
{
public:
TGrid<T>::TGrid() :
MinX(0),
MinY(0),
MinZ(0),
MaxX(0),
MaxY(0),
MaxZ(0),
SizeX(0),
SizeY(0),
SizeZ(0)
{}
TGrid<T>::~TGrid() {}
// The following 6 methods return the min or max values of the grid
int32 GetMinX() { return MinX; }
int32 GetMinY() { return MinY; }
int32 GetMinZ() { return MinZ; }
int32 GetMaxX() { return MaxX - 1; }
int32 GetMaxY() { return MaxY - 1; }
int32 GetMaxZ() { return MaxZ - 1; }
// Get the object at current valid location
T Get(const int32 &x, const int32 &y, const int32 &z);
// Add or replace at given grid coordinates (expand grid if necessary)
void Add(T obj, const int32 &x, const int32 &y, const int32 &z);
private:
std::vector<std::vector<std::vector<T>>> Grid; // Pointer to 3D array of type T
int32 MinX, MinY, MinZ, MaxX, MaxY, MaxZ; // Virtual array size
int32 SizeX, SizeY, SizeZ; // Actual size
// Check to make sure grid[x,y,z] is valid
bool IsCorrectIndex(const int32 &x, const int32 &y, const int32 &z);
// Set the object at current valid location
void Set(T obj, const int32 &x, const int32 &y, const int32 &z);
// Expand the grid size
void ExpandGrid(const int32 &dMinX, const int32 &dMinY,
const int32 &dMinZ, const int32 &dMaxX,
const int32 &dMaxY, const int32 &dMaxZ);
};