Create a vector, pass by value to an object and use it, or use a public vector instance of object?

[tonnot]

It is a doubt I have from the beggining og my C++ learning.

I have a main class and I have a object that has the capability of fill a big vector.
What is best :

Method 1:
Class A:
 create vector;
 call classB passing vector by value (or by pointer ?)(classB fills the vector)
 loop trought vector data.

Method 2:
Class A.
  call classB
  loop troughout classB->vector data

Any tip ? Thanks

[firedraco]

I'd put it into classB if it should be part of it. (It seems to be like that in this case)

[tonnot]

In general terms, what is fast ? Method 1 or method 2 ???

As a general rule, what is best (in terms of speed) :
1.- Create vectors, pass to a classB by ref, use it from class A .
2.- Use the vector from classB ?

And as general rule, what is best for a vector, pass by ref or by pointer ??? (or it is the same?)

Thanks

[Athar]

1.- Create vectors, pass to a classB by ref, use it from class A .
2.- Use the vector from classB ?

How could creating a new vector be faster than using an existing one?

or it is the same?

In terms of speed, it's the same.