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  ANSI Common Lisp   12 Numbers   12.2 Dictionary of Numbers

12.2.67 deposit-field Function

deposit-field newbyte bytespec integer    result-integer

Arguments and Values:
newbyte - an integer.

bytespec - a byte specifier.

integer - an integer.

result-integer - an integer.

Replaces a field of bits within integer; specifically, returns an integer that contains the bits of newbyte within the byte specified by bytespec, and elsewhere contains the bits of integer.

 (deposit-field 7 (byte 2 1) 0)  6
 (deposit-field -1 (byte 4 0) 0)  15
 (deposit-field 0 (byte 2 1) -3)  -7

See Also:
byte, dpb

 (logbitp j (deposit-field m (byte s p) n))
 ==(if (and (>= j p) (< j (+ p s)))
        (logbitp j m)
        (logbitp j n))

deposit-field is to mask-field as dpb is to ldb.

Allegro CL Implementation Details:

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