Is it possible to change the logical operator depending on the variable?

Question

C++ / C#

There is this expression:

if (x_direction > 0)
{
    if (f_pos.x > R)
    rot_direction2 = false;
}
else
{
    if (f_pos.x < -R)
    rot_direction2 = false;
}

In this case, the value of the x_direction variable can only be 1 or -1. I really want to cut it all into one condition. You can already add R*x_direction, only the > sign should also change to <, but I don’t understand how to do this. That is, I want to write something like <*x_direction, but, of course, you can’t do that. Somehow, through algebra-logic, it also doesn’t work, are there any options at all to write all this condition into one? It just doesn't look very good here.

Answer 1

if (f_pos.x * x_direction > R) {
    rot_direction2 = false;
}

Answer 2

Well, at least this can be combined into one if with a complex condition:

if ((x_direction > 0 && f_pos.x > R) || (x_direction < 0 && f_pos.x < -R))

You can mathematically still drag ;-)