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From: Bart <bc@freeuk.com>
Newsgroups: comp.lang.c
Subject: Re: Top 10 most common hard skills listed on resumes...
Date: Sun, 8 Sep 2024 17:36:36 +0100
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On 08/09/2024 17:14, Ben Bacarisse wrote:
> Bart <bc@freeuk.com> writes:
> 
>> On 07/09/2024 02:44, Waldek Hebisch wrote:
>>> Bart <bc@freeuk.com> wrote:
>>>> On 06/09/2024 11:19, Waldek Hebisch wrote:
>>>>> Bart <bc@freeuk.com> wrote:
>>
>>>> (You can balance it out by by requiring ASSIGN(&A, &B)!)
>>> This would not work in general, as I wrote it, the following are
>>> valid:
>>> assign(&a, 42)
>>> assign(&a, a + 1)
>>> but the second argument has no address, so your variant would not
>>> work.
>>
>> I believe that C's compound literals can give a reference to a+1:
> 
> Is there no part of C you can't misrepresent?

Is nothing I write that you will take issue with?

> 
>>    #include <stdio.h>
>>
>>    void assign(int* lhs, int* rhs) {
>>        *lhs = *rhs;
>>    }
>>
>>    int main(void) {
>>        int a=20;
>>
>>        assign(&a, &(int){a+1});
> 
> This is simply an anonymous object.  You could have used a named object
> and it wold not have been any further from being a "reference to a+1".

I suggested a 'assign()' function could have balanced parameters by 
requiring:

     asssign(&A, &B);

Someone objects that you can't in general apply & to arbitrary, unnamed, 
transient, intermediate values such as 'a + 1'.


I showed how you could do that using anonymous compound literals which 
avoids having to create an explicit named temporary which in standard C 
would need to be outside of that assignment call.

But you apparently have a problem it.

Or more likely you have a problem with me.