initialize a vector with differentes instances of a class (has random parameters)

I'm tying to get a vector of Ind class with 30 different instances (some parameters inside Ind class are genetated randomly)

Ind prueba(n, e0);
cout << prueba.getVariables() << endl; //get variables method return a vector
Ind prueba2(n, e0);
cout << prueba2.getVariables();

If I created two instances like that, both of them are different in the Variables attribute ( a vector with random components)

I'm trying to make a vector full with different instances of that class with the constructor

vector<Ind> padres(30, Ind(n, e0)); //n and e0 are ints and are irrelevant for the problem

but it looks like the vector "padres" contains just one instance 30 times.

thanks to all of you in advance