In C++ what causes an assignment to evaluate as true or false when used in a control structure?

Question

So can someone help me grasp all the (or most of the relevant) situations of an assignment inside something like an if(...) or while(...), etc?

What I mean is like:<

Answer 1

The return type of the assignment is the left hand value, it's what allows statements like a = b = c to compile. In your example:

while(a = &c)
{
}

Returns true when "a" is true, after it has been assigned the value of &c.