Here is another way to make make classname itself fail without changing its
implementation.
procedure classname(c)
static builtin_classname
initial builtin_classname := proc("classname", 0)
&error := 1 # convert runtime errors to failures
cname := builtin_classname(c)
&error := 0
return \cname
end
--Jafar
On Thu, Apr 18, 2013 at 9:40 PM, Jafar Al-Gharaibeh <to.ja...@gmail.com>wrote:
> Bruce,
>
> In theory you can change any function to fail instead of doing a
> runtime error, here is how I would do isClass()
>
> procedure isClass(c)
> local cname
> &error := 1 # convert runtime errors to failures
> cname := classname(c)
> &error := 0
> return \cname
> end
>
> Cheers,
> Jafar
>
>
>
> On Thu, Apr 18, 2013 at 9:16 PM, Bruce & Breeanna Rennie <
> bren...@dcsi.net.au> wrote:
>
>> Good morning Gentlemen,
>>
>> Further to my original note, I thought it might be useful to show the
>> procedure that I am using.
>>
>> procedure isClass(_val, _classname)
>> local t := type(_val)
>> if right(t,7) == "__state" then
>> return classname(_val) == _classname
>> else
>> return fail
>> end
>>
>> If there is a better way to do this, I will be grateful to know it.
>>
>> regards and thanks
>>
>> Bruce Rennie
>>
>>
>> On 18/04/13 23:54, Bruce & Breeanna Rennie wrote:
>>
>> Clint and Jafar,
>>
>> How much effort would it be to change the behaviour of the function
>> "classname" to fail on a non-class value instead of aborting the
>> program? Are there any of the other functions that would be better off
>> failing instead of aborting?
>>
>> In its current form it is just about useless for writing generalised
>> code using it. I am finding that a routine using type gives me more
>> generic results.
>>
>> regards
>>
>> Bruce Rennie.
>>
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