Question

I’ve been struggling for a while with a part of my code and I finally found that the problem lies with a simple test that don’t give me the result I expect.

if (2) //=> true
if (2 & true) //=> false
if (bool(2) & true) //=> true

What I don’t understand is why the second line results in false.
My understanding was that every non-zero integer was considered as true in a test.

Answer 1

Because the bitwise and between 2 and true is false.

& (bitwise operator) is different than && (logical operator).

true cast to int is 1.

So 2 & true is 2 & 1 which is false – because 0000000000000010 & 0000000000000001 == 0. (bits may vary)

Whereas bool(2) == 1, and 1 & 1 is true.