How can I get a reference to a object in the world in UE4?

Question

I'm coding a simple maze game in UE4 and I have everything I wanted to implement done except having an obstacle in the scene. What I have is a simple Obstacle class which is a child of an Actor class.

Now in the scene I have a Blueprint which is a child of the Obstacle class and this Blueprint is placed in the maze. What I'm trying to achieve is when the player collects so many objects (let's say 10) then the Obstacle will be destroyed but I don't know how to get a reference to that Obstacle object in my code.

AObstacle* Obstacle /////// This is where I don't know how to initialize the object
if (MyCharacter->collectedPickUps >= requiredAmountOfPickups)
{
    Obstacle->Destroy();
    Obstacle->isActive = false;
}

Answer 1

I have managed to sort it out. Basically I have to use an Actor Iterator which iterates through every Obstacle object in the game world. Here is the code:

for (TActorIterator<AObstacle> ObstacleItr(GetWorld()); ObstacleItr; ++ObstacleItr)
{
    if (MyCharacter->collectedPickUps >= requiredAmountOfPickups)
    {
        ObstacleItr->Destroy();
        ObstacleItr->bIsActive = false;
    }
}