C++ bools define `true` as `value == 1`, not merely `value != 0`; casts are dangerous!

bools.cpp

#include <iostream>

void f(bool b) {
    if (b == true)  { std::cout << "true\n";  }
    if (b == false) { std::cout << "false\n"; }
}

int main() {
    char c = 2;
    bool * b = (bool*) &c;
    f(*b);
} 

/*
Without optimizations might print:
true
false
*/