Is using std::vector< std> > an antipattern?

Question

For a long time I was using std::vector and std::shared_ptr hand in hand. Recently I started using std::shared_ptr when

Answer 1

1 The problem is not related to shared_ptr<>, but occurs already for ordinary pointers:

template
void foo(std::vector);

int a,b;
std::vector bar={&a,&b};
foo(bar);        // no value for ??? works

2 The construct vector> is sensibly only iff there is no owner to the objects hold.