Mask (computing)

In computer science, a mask is data that is used for bitwise operations, particularly in a bit field.

Using a mask, multiple bits in a byte, nibble, word (etc.) can be set either on, off or inverted from on to off (or vice versa) in a single bitwise operation.

Other related articles:

Mask (computing) - Uses of Bitmasks - Hash Tables
... To create a hashing function for a hash table often a function is used that has a large domain ... To create an index from the output of the function, a modulo can be taken to reduce the size of the domain to match the size of the array however, it is often faster on many processors to restrict the size of the hash table to powers of two sizes and use a bit mask instead ...

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