《通链参考手册》


Function BYTE, BYTE-SIZE, BYTE-POSITION

●语法设定:

byte size position => bytespec

byte-size bytespec => size

byte-position bytespec => position

●参数和值:

size, position---a non-negative integer.

bytespec---a byte specifier.

●详情:

byte returns a byte specifier that indicates a byte of width size and whose bits have weights 2^position + size - 1 through 2^position, and whose representation is implementation-dependent.

byte-size returns the number of bits specified by bytespec.

byte-position returns the position specified by bytespec.

●例子:

 (setq b (byte 100 200)) =>  #<BYTE-SPECIFIER size 100 position 200>
 (byte-size b) =>  100
 (byte-position b) =>  200

●受制于: 无。

●例外情况: 无。

●更多信息:

ldb, dpb

●说明:

 (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


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