15.2.34 bit-and, bit-andc1, bit-andc2, bit-eqv,

bit-ior, bit-nand, bit-nor, bit-not, bit-orc1, bit-orc2, bit-xor

[Function]

bit-and bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-andc1 bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-andc2 bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-eqv bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-ior bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-nand bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-nor bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-orc1 bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-orc2 bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-xor bit-array1 bit-array2 &optional opt-arg ⇒ resulting-bit-array

bit-not bit-array &optional opt-arg ⇒ resulting-bit-array

Arguments and Values::

bit-array, bit-array1, bit-array2—a bit array.

Opt-arg—a bit array, or t, or nil. The default is nil.

Bit-array, bit-array1, bit-array2, and opt-arg (if an array) must all be of the same rank and dimensions.

resulting-bit-array—a bit array.

Description::

These functions perform bit-wise logical operations on bit-array1 and bit-array2 and return an array of matching rank and dimensions, such that any given bit of the result is produced by operating on corresponding bits from each of the arguments.

In the case of bit-not, an array of rank and dimensions matching bit-array is returned that contains a copy of bit-array with all the bits inverted.

If opt-arg is of type (array bit) the contents of the result are destructively placed into opt-arg. If opt-arg is the symbol t, bit-array or bit-array1 is replaced with the result; if opt-arg is nil or omitted, a new array is created to contain the result.

Figure 15–4 indicates the logical operation performed by each of the functions.

2

Function                                                   Operation                                   
_______________________________________________________________________________________________________
                                                           
bit-and                                                    and                                         
bit-eqv                                                    equivalence (exclusive nor)                 
bit-not                                                    complement                                  
bit-ior                                                    inclusive or                                
bit-xor                                                    exclusive or                                
bit-nand                                                   complement of bit-array1 and bit-array2     
bit-nor                                                    complement of bit-array1 or bit-array2      
bit-andc1                                                  and complement of bit-array1 with bit-array2
bit-andc2                                                  and bit-array1 with complement of bit-array2
bit-orc1                                                   or complement of bit-array1 with bit-array2 
bit-orc2                                                   or bit-array1 with complement of bit-array2 
  Figure 15–3: Bit-wise Logical Operations on Bit Arrays

Examples::

 (bit-and (setq ba #*11101010) #*01101011) ⇒  #*01101010
 (bit-and #*1100 #*1010) ⇒  #*1000      
 (bit-andc1 #*1100 #*1010) ⇒  #*0010
 (setq rba (bit-andc2 ba #*00110011 t)) ⇒  #*11001000
 (eq rba ba) ⇒  true
 (bit-not (setq ba #*11101010)) ⇒  #*00010101
 (setq rba (bit-not ba 
                     (setq tba (make-array 8 
                                           :element-type 'bit))))
⇒  #*00010101
 (equal rba tba) ⇒  true
 (bit-xor #*1100 #*1010) ⇒  #*0110

See Also::

lognot, logand