Re: Top 10 most common hard skills listed on resumes...

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Sujet : Re: Top 10 most common hard skills listed on resumes...
De : bc (at) *nospam* freeuk.com (Bart)
Groupes : comp.lang.c
Date : 12. Sep 2024, 13:00:18
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vbuhk1$733i$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
User-Agent : Mozilla Thunderbird
On 12/09/2024 00:47, Ben Bacarisse wrote:
Bart <bc@freeuk.com> writes:
 
On 11/09/2024 01:02, Ben Bacarisse wrote:
Bart <bc@freeuk.com> writes:
>
Sorry, did your remark above suggest I don't know what an lvalue is?
That seemed like the obvious explanation for the incorrect information
you gave.  Did you post it /knowing/ what other kinds of things are
lvalues in C just to confuse people?
>
Which incorrect explanation was that?
>
I merely said that LHSs of assigments fall into these categories:
>
    A = Y;         // name
    *X = Y;        // pointer
    X[i] = Y;      // index
    X.m = Y;       // member select
 Yes, that incorrect explanation.
I dispute that. What I said is very broadly correct. But in this newgroup you do like to nitpick.
So to you, it is of the greatest importance that somebody doesn't just know about those four categories that they will be reading and writing all the time in C code, but also know about:
   (int){A} = Y;
which they will encounter approximatey never. And it is also vital they they consider:
    (A) = (Y);
a distinct category. There might be a case for this for '(Z, A) = Y;' but that isn't allowed anyway. So it only applies to superfluous parentheses.

 
Clearly I mean VALID LHSs, otherwise they wouldn't be LHSs of assignments!
>
I've since learnt about a couple of other possible categories; one is with
compound literals like '(int){42} = 0'.
 Along with (a) _Generic expressions (where the selected arm is an
lvalue)
The _Generic forms reduce down one of those four. It is more like a macro, and if you're going to start with macros, there are unlimited categories that can be created. If this is merely about syntax, then why not?
(I'd also like to see an actual usecase for _Generic on the LHS of an assignment. Perhaps one where there is a matching (symmetric?) _Generic on the RHS?)

and (b) expressions of the form X->m.
Are there any circumstances where X->m does something different from (*X).m?

(I don't count (A), ((A)) etc as a
separate category; come on!)
 Don't give me "come on!".  I was counting forms in the same way that you
were when I said I could think of three more.  I was not counting
parentheses.
Keith mentioned this form.

 
The other is 'X.m' but when .m is a bitfield;
 What makes X.m = Y, where m is a bitfield, an extra category?  It fits
the X.m = Y pattern perfectly well.
 
although this has the same
same syntax as above, internally it's somewhat different.
 Your categories were syntactic.  You were describing forms.
Not entirely. There is behaviour associated with them.
Most LHS terms can have & applied in an rvalue context for example; bitfield accesses can't. So it's something a user of the language needs to know about.
And internally, my ASTs (where bitfields are supported) use a different node type when X.m is a bitfield rather than a regular access.

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