Tuple isn't being constructed in order?

Question

The following program:

#include 
#include 

struct A {
    A() { std::cout << \"A constructor\\n\"; }
};

struct B {
    B         


        

Answer 1

std::tuple construction order is currently unspecified.

A proposal for a concrete decision on its order has been submitted to the committee but until then the order should not be relied on.