C++ - value of uninitialized vector

Question

I understand from the answer to this question that values of global/static uninitialized int will be 0. The answer to this one says that for vectors, the default construc

Answer 1

It is not undefined behaviour, a vector automatically initialises all its elements. You can select a different default if you want.

The constructor is:

vector( size_type, T t = T() )

and for int, the default type (returned by int()) is 0.

In a local function this:

int x;

is not guaranteed to initialise the variable to 0.

int x = int();

would do so.

int x();

sadly does neither but declares a function.