Re: [pro] BOA constructor and supplied-p argument

Pascal Costanza wrote:

• The more important reason is that I sometimes want to derive some

value from an argument that is "very close" to the value of the original argument. Here is an example:

I would go even farther than that. Sometimes, you want to slightly frob the original argument and not use it anymore afterwards. In such situations, you can even use the same variable name (one might consider this either very stylized or very ugly ;-).

CL-USER> (defun foo (arg &aux (arg (1+ arg))) arg) FOO CL-USER> (foo 1) 2