The macro defadvice resembles defun in that the code for
the advice, and all other information about it, are explicitly stated in
the source code. You can also create advice whose details are computed,
using the function ad-add-advice.
ad-add-advice adds advice as a piece of advice to
function in class class. The argument advice has
this form:
(name protected enabled definition)
Here protected and enabled are flags, and definition
is the expression that says what the advice should do. If enabled
is nil, this piece of advice is initially disabled
(see section Enabling and Disabling Advice).
If function already has one or more pieces of advice in the
specified class, then position specifies where in the list
to put the new piece of advice. The value of position can either
be first, last, or a number (counting from 0 at the
beginning of the list). Numbers outside the range are mapped to the
closest extreme position.
If function already has a piece of advice with the same name, then the position argument is ignored and the old advice is replaced with the new one.
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