<ixelp>
Corece to boolean in Common Lisp - Stack Overflow
<jmercouris>
is there no other idiomatic way?
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<jmercouris>
why no COERCE way?
<jmercouris>
also why would that be preferred over (if FORM t nil) ?
<aeth>
not not just happens to be the idiomatic way, I think
<jmercouris>
I've used not not before, I am just thinking about it
<jmercouris>
it really got me thinking, not not doesn't really clearly signal the intent of the programmer
<jmercouris>
it strikes me as more of a hack than a formal expression of intent
<_death>
jmercouris: the IF form is clearer, if you really need to do that
<thuna`>
What about NOT NULL?
<jmercouris>
thuna`: what about it?
<jmercouris>
_death: yes.
<thuna`>
I feel that NOT NULL reads better than NOT NOT, but is that also too hack-y?
<aeth>
I think NOT NOT reads clearer because it's clear that it's two of the same thing
<aeth>
the IF form has the advantage that it's almost the same thing if you want bits 1 and 0 instead, which is probably more common than needing T and NIL
<aeth>
e.g. for CFFI or for a bit array
<thuna`>
I think that NOT NULL is better because it is exactly what we are asking for; "Is it true (thus not nil)?"
<thuna`>
s/nil/equal to nil, thus null/
<beach>
Usually, no conversion to Boolean is needed. A generalized Boolean is fine. It is another matter to avoid the use of values that are explicitly not Boolean in conditional operators.
<beach>
jmercouris: Why do you feel the need to have a Boolean?
<jmercouris>
just like for CFFI, I am communicating with someone else, who wants a boolean
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<jmercouris>
in this case, I am serializing data to json, and want a boolean
<beach>
Oh, FFI! Of course!
<beach>
I should have known.
<jmercouris>
yeah, it is an interesting problem
<beach>
Not to me.
<jmercouris>
well, it is to me :-D
<jmercouris>
probably because i do a lot of FFI work
<beach>
Yes.
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<_death>
jmercouris: the json library that I use represents json's true as :true and false as :false
<aeth>
I need to write a define-json-library
<aeth>
so I can have the most popular library
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<jmercouris>
that's what we need, another json library
<beach>
And another game engine that is not used to create any games.
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<aeth>
jmercouris: no, one level more meta than that
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<agm>
I see that many of you are not entirely satisfied with debugging tools of free CL implementations. soon I will add breakpoints and stepping to my implementation (https://savannah.nongnu.org/p/alisp), I hope you'll give it a try!
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<scymtym>
agm: what is the purpose of the symbol_name structure?
<scymtym>
i'm asking because (error 'foo) segfaults since, it seems, builtin_error expects a symbol as the first argument but gets a symbol_name
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<scymtym>
i guess this is related to READing incomplete objects?
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<agm>
scymtym: you're right. the struct symbol_name is an implementation detail that is only visible in C. it allows reading objects one line at a time, a feature that i wanted even if it is not strictly needed
<agm>
scymtym: i can replicate your bug, now I'm looking into it
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<scymtym>
agm: i see, thanks
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<agm>
scymtym: actually, the bug is simpler. can I credit you as "scymtym" for reporting it?
<scymtym>
agm: sure if you want to. but you don't have to
<agm>
:)
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