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Performs a bit-wise logical or, usually on two ints. It can also be used on booleans in logical expressions, though normally you use ||. || is sometimes called short circuit | or McCarthy |.

The | character is created by hitting shift-\. Sometimes it is displayed with a break, sometimes not. It can be hard to tell apart from Il1! in some fonts.

0b1110_0000 | 0b1000_00010b1110_0001

Logical OR is a logical carryless bitwise addition, 1s where either operand has a 1, otherwise 0.

0 | 00
0 | 11
1 | 01
1 | 11

Useful for combining bit masks. Don’t confuse this with ||. Given that you have a mask to describe the bit (all zeros, one one), to turn on a bit, use | mask .


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