Edit object in vector - c++

Question

How can i edit a object in a vector?
Right now my vector is vector<PCB> M3M;
Inside it are a few objects from my class below.
class PCB
{
public:
void setPID (int a)
{
PID = a;
}
int retrievePID()
{
return PID;
}
int retrieveLimit()
{
return Limit;
}
void setLimit (int a)
{
Limit = a;
}
int retrieveBase()
{
return Base;
}
void setBase (int a)
{
Base = a;
}
int retrieveHoleTrueOrFalse()
{
return HoleTrueOrFalse;
}
void setHoleTrueOrFalse (int a)
{
HoleTrueOrFalse = a;
}
private:
int PID;
int Limit;
int Base;
int HoleTrueOrFalse;
};
How would i be able to edit the PID part in any place i choose in my object?
For example i want to set a new PID in my vector at M3M[4]. How do i go about doing that?

Answer 1

M3M[4].setPID(<new PID>);

Answer 2

You also can have an iterator that can point to an element in your array and set a new PID to that. Example:
std::vector<PCB>::iterator it = M3M.begin();
//this will advance your iterator by 3
it += 3;
it->setPID(5); // this will set the 3rd element's PID to 5
Keep in mind that your vector needs to have at least 4 elements in order for the code above to execute. In order to you fill your vector, you can use push_back() method of your vector.
M3M.push_back(PCB(0));
M3M.push_back(PCB(1));
M3M.push_back(PCB(2));
M3M.push_back(PCB(3));
M3M.push_back(PCB(4));