Function does not change passed pointer C++

Question

I have my function and I am filling targetBubble there, but it is not filled after calling this function, but I know it was filled in this function because I have there output code.

bool clickOnBubble(sf::Vector2i & mousePos, std::vector<Bubble *> bubbles, Bubble * targetBubble) {     targetBubble = bubbles[i]; } 

And I am passing the pointer like this

Bubble * targetBubble = NULL; clickOnBubble(mousePos, bubbles, targetBubble); 

Why it is not working?

Answer 1

Because you are passing a copy of pointer. To change the pointer you need something like this:

void foo(int **ptr) //pointer to pointer {     *ptr = new int[10]; //just for example, use RAII in a real world } 

or

void bar(int *& ptr) //reference to pointer (a bit confusing look) {     ptr = new int[10]; }