12.2.70 ldb-test [Function]

ldb-test bytespec integer ⇒ generalized-boolean

Arguments and Values::

bytespec—a byte specifier.

integer—an integer.

generalized-boolean—a generalized boolean.

Description::

Returns true if any of the bits of the byte in integer specified by bytespec is non-zero; otherwise returns false.

Examples::

 (ldb-test (byte 4 1) 16) ⇒  true
 (ldb-test (byte 3 1) 16) ⇒  false
 (ldb-test (byte 3 2) 16) ⇒  true

See Also::

byte , ldb , zerop

Notes::

 (ldb-test bytespec n) ≡
 (not (zerop (ldb bytespec n))) ≡
 (logtest (ldb bytespec -1) n)