sending address of a variable declared on the stack?
- by kobac
I have a doubt concerning declaring variables, their scope, and if their address could be sent to other functions even if they are declared on the stack?
class A{
AA a;
void f1(){
B b;
aa.f2(&b);
}
};
class AA{
B* mb;
f2(B* b){
mb = b;
//...
}
};
Afterwards, I use my AA::mb pointer in the code.
So things I would like to know are following. When the program exits A::f1() function, b variable since declared as a local variable and placed on the stack, can't be used anymore afterwards.
What happens with the validity of the AA::mb pointer?
It contains the address of the local variable which could not be available anymore, so the pointer isn't valid anymore?
If B class is a std::<vector>, and AA::mb is not a pointer anymore to that vector, but a vector collection itself for example. I would like to avoid copying all of it's contents in AA::f2() to a member AA::mb in line mb = b. Which solution would you recommend since I can't assign a pointer to it, because it'll be destroyed when the program exits AA::f2()
