Global vector emptying itself between calls?

Question

I have a vector in a header, like so:

extern std::vector g_vector;

In the associated cpp file I have this:

std::         


        

Answer 1

Order of initialization of global values is not defined.

Read here about the static initialization fiasco.

When you declare Bar in a function - the g_vector will be initialized before, because its promised to be initialized before the program runs. If Bar is a global variable - then you have a problem.