Re: about register

[Le TeXnicien de Surface <texnicien.de.surface@chezmoi.eur>]

Daniel Jensen écrivait/wrote :

> Le TeXnicien de Surface <texnicien.de.surface@chezmoi.eur> writes:
> 
>> I'd like to use the following command:
>> (defun complete-pid ()
>>   (interactive)
>>   (goto-char 0)
>>   (number-to-register 1 "A")
>>   (while (re-search-forward "p=PID=0" nil t)
>>     (insert-register "A")
>>     (increment-register 1 "A")
>> ))
>>
>> but when emacs finds the first `p=PID=' it says:
>> `register does not contain a number'
>> and stops.
> 
> You are using strings as register names, this is why it does not work.
> The problem lies in how registers are implemented; they are compared
> behind the scenes with the eq predicate. However, strings are not eq.
> Use characters instead (e.g., ?A), 
Thank you, it works.
BTW where could I find such a piece of information about character?
Is it lisp or emacs-specific?

> or perhaps better do away with the register and use a variable.
I will try to remember that next time I need such a command ;-) But won't
there be some catch to write the value of the variable in the buffer?

Once again, many thanks.
-- 
Le TeXnicien de Surface