Is it always false == 0, true == 1 in C++?

Question

Programming

Will this code always work correctly?

int A[2] = { 3, 5 }, y, z;
bool x = false;
y = A[x]; // y==3
z = A[!x]; // z==5

Are there implementations where it is not true that false == 0, true == 1?

Answer 1

Everything about this is clear in the standard.
eelis.net/c++draft/conv.prom#6

Answer 2

Always in C++ false == 0, true == 1

Answer 3

false == 0, true != 0

Answer 4

In C++, there are a billion and 1 ways to shoot yourself in the foot or give yourself a headache for a couple of weeks with a small line, and on different compilers this number and cold-blooded tricks vary. For example classic
In, I dug up an ancient funny joke.