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ANSI Common Lisp  12 Numbers 12.2 Dictionary of Numbers
| 12.2.66 byte, byte-size, byte-position |
Function |
- Syntax:
-
byte
size position
 bytespec
byte-size
bytespec
size
byte-position
bytespec
position
- Arguments and Values:
-
size, position - a non-negative integer.
bytespec - a byte specifier.
- Description:
-
byte returns a byte specifier that indicates
a byte of width size and whose bits have weights
2position + size - 1 through 2position,
and whose representation is
implementation-dependent.
byte-size returns the number of bits specified by bytespec.
byte-position returns the position specified by bytespec.
- Examples:
-
(setq b (byte 100 200)) #<BYTE-SPECIFIER size 100 position 200>
(byte-size b) 100
(byte-position b) 200
- See Also:
-
ldb, dpb
- Notes:
-
(byte-size (byte j k)) ==j
(byte-position (byte j k)) ==k
A byte of size of 0 is permissible;
it refers to a byte of width zero. For example,
(ldb (byte 0 3) #o7777) 0
(dpb #o7777 (byte 0 3) 0) 0
- Allegro CL Implementation Details:
-
None.
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