|= operator

Format

A |= B

Set A equal to A | B. It is shorthand for A = A | B.

This is commonly used to turn on certain bitfields in a word.

usr.sight |= BLIND // turn on the blind bit

If A and B are lists, any items in B that are not already in A are added to A.

If A is an /icon or /matrix datum, the datum will be changed rather than creating a new one and re-assigning it to A.

See also

• operators
• | operator