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Bitwise Boolean Inverse

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Craige ( Craige Leeder )

Pinned 5 Codes
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Language	C
Expires	Never
Length	36 Characters (3 Lines)
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Description

Inverse a boolean value using bitwise &

bool b = false;
b = ((b + 1) & 1)

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Craige

Posted 3.4 Years Ago

I don't know, lol. Didn't really care when I wrote it. Thanks for the tip
though!

Uranium-239

Posted 3.5 Years Ago

In that case, why didn't you just do:

b = ~b & 1

?

The complement operation is faster than an addition.

Craige

Posted 3.5 Years Ago

Incorrect. False is 0, and True is 1. The nature of a boolean is that it only has 2
possible values.

What you are getting into is the evaluation of a value as a boolean. In almost all
programming languages, you are correct. 0 evaluates to False, and anything but will
evaluate to True. However, this does not make True equal to anything but False.

My code is perfectly acceptable (though unreasonable to use an production code).

Uranium-239

Posted 3.5 Years Ago

This is incorrect and should not be used in applications as it is exploitable.

The correct code would be:

bool bvar = false;
bvar = !bvar; // bvar is now true
bvar = !bvar; // bvar is now false etc...

The reason being is that with boolean values, false is 0 and true is ANYTHING else
(not always 1).

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