What is the overhead cost of an empty vector?

Question

What is the memory overhead of having an empty vector vs having a pointer to a vector?

Option A:

std::vector v;

Option B

Answer 1

In Visual Studio Community 2017 (Version 15.2), running this code:

#include 
#include 

using namespace std;

void main()
{
    vector test;
    vector* test2 = &test;
    cout << sizeof(test) << "\n";
    cout << sizeof(test2) << "\n";

    cout << "\n";
    system("pause");
}

Running in 32 bit (x86), I get 16 bytes for the vector and 4 bytes for the vector pointer.

Running in 64 bit (x64), I get 32 bytes for the vector and 8 bytes for the vector pointer.