9.6. Bit String Functions and Operators
This section describes functions and operators for examining and
manipulating bit strings, that is values of the types
bit
and
bit varying
. (While only
type
bit
is mentioned in these tables, values of
type
bit varying
can be used interchangeably.)
Bit strings support the usual comparison operators shown in
Table 9.1
, as well as the
operators shown in
Table 9.14
.
Table 9.14. Bit String Operators
Operator Description Example(s) 

Concatenation

Bitwise AND (inputs must be of equal length)

Bitwise OR (inputs must be of equal length)

Bitwise exclusive OR (inputs must be of equal length)

Bitwise NOT

Bitwise shift left (string length is preserved)

Bitwise shift right (string length is preserved)

Some of the functions available for binary strings are also available for bit strings, as shown in Table 9.15 .
Table 9.15. Bit String Functions
In addition, it is possible to cast integral values to and from type
bit
.
Casting an integer to
bit(n)
copies the rightmost
n
bits. Casting an integer to a bit string width wider
than the integer itself will signextend on the left.
Some examples:
44::bit(10) 0000101100 44::bit(3) 100 cast(44 as bit(12)) 111111010100 '1110'::bit(4)::integer 14
Note that casting to just
"
bit
"
means casting to
bit(1)
, and so will deliver only the least significant
bit of the integer.