How to assign the value of another to one vector in C++?

Question

C++ / C#

But not at creation. Both vectors are already created and have some elements. I know that you can clear through vector.clear();Tried through vector1.assign(vector2);and does not work

Answer 1

en.cppreference.com/w/cpp/container/vector
v1 = v2
doesn't work?

Answer 2

Equate them?