c++ - STL containers on the stack and the heap

Question

If std::vector and friends are self resizing, does that mean if I declare a vector like so:

std::vector<string> myvec;

Then it'll resize using more stack, whereas:

std::vector<string> *myvec = new std::vector<string>();

Would resize using more heap?

Answer 1

Vectors allocate on the heap in their internals.

The only thing you pay for in the stack for a stack based bector is a couple of bytes, the inner buffer will always be allocated from the heap.

So effectively when you do a vec = new vector() you are allocating a small quantity, which may not be really good.