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&body 54
I
is a symbol. You can use return-from for methods. The name of a
method's implicit block is the name of the generic function it implements.
If the name of the generic function is a list, the block name is the second
symbol in that list.
For a table of related items: See the section "Blocks and Exits Functions
and Variables" in Symbolics Common Lisp: Language Concepts.
&body
Lambda List Keyword
This keyword is used with macros only. I t is identical in function to
&rest, but it informs output-formatting and editing functions that the
remainder of the form is treated as a body, and should be indented accordingly.
Note that either &body or &rest, but not both, should be used in any
definition.
boole op integerl &rest more-integers Function
boole is the generalization of logical functions such as logand, logior and
logxor. It performs bit-wise logical operations on integer arguments
returning an integer which is the result of the operation.
The argument op specifies the logical operation to be performed; sixteen
operations are possible. These are listed and described in the table below
which also shows the truth tables· for each value of op.
op can be specified by writing the name of one of the constants listed
below which represents the desired operation, or by using an integer between
0 and 15 inclusive which controls the function that is computed. If
the binary representation of op is abcd (a is the most significant bit, d the
least) then the truth table for the Boolean operation is as follows:
integer2
1 B 1
integerl
BI a c
11 b d
Examples:
(boole 6 B B) => B
(boole 11 1 B) => -2
(boole 2 6 9) => 9
a=B
a=1 and b=B
a=b=d=B c=1 therefore 1J s appear only
when integer1 is Band integer2 is 1
With two arguments, the result of hoole is simply its second argument. At
least two arguments are required.