Default constructor value for bool type

Question

Which value does the default constructor of the bool type return in C++?

For instance, writing

int i = int(); 

guarantees that the variable i will be initiated always with 0.

I guess such an initialization routine is possible as well:

bool b = bool(); 

But unfortunately I could not find anywhere which value such a default bool constructor is defined to return. Is the variable b always initialized with false or true.

Answer 1

false.

Seen in the C++14 draft N4296, section 8.5 (Initializers), paragraph 6, list item 1 and references therein, and paragraph 8, list item 4.

Answer 2

bool is an integral type, and value-intialization should make it zero.