Question

I’m declaring a struct inside my code and then trying to insert it into a data structure that I have written. However, I’m concerned that since I declare the struct inside the function, once the function ends, the data structure will be pointing to garbage. Can anyone help with this?

Here’s the code:

 void Class::function()  {   // do some stuff   node newNode;   newNode.memAddr = tempNode.memAddr+totalSize;   newNode.size = tempNode.size-totalSize;   lists[newNode.size>=512?64:(newNode.size>>3)].insert(&newNode);  } 

Edit: I’m actually trying to re-write malloc, so calling malloc() or new will not work here. Is there some way that I could move this code into the insert method and then make it work in a way that it would not fall out of scope in insert?

Answer 1

It will be out of scope after function returns, yes. That is not valid. You want to allocate it on the heap.

Edit: Unless you copy the memory you point to in insert, of course.