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From: Thiago Adams <thiago.adams@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: constexpr keyword is unnecessary
Date: Sat, 19 Oct 2024 16:41:25 -0300
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Em 10/19/2024 1:03 PM, David Brown escreveu:
> On 19/10/2024 17:18, Thiago Adams wrote:
>> Em 10/18/2024 8:54 PM, Keith Thompson escreveu:
>>> Thiago Adams <thiago.adams@gmail.com> writes:
>>>> I think constexpr keyword is unnecessary.
>>>
>>> Sure, most language features are strictly unnecessary.
>>>
>>>> Anything you do with it could/should be done with const.
>>>
>>> No, absolutely not.
>>>
>>
>> If not, do you have a sample where, using "const" as "constexpr", 
>> would create problems?
>>
>> The sample I know is VLA.
>>
>> const int c = 2;
>> int a[c]; //a is VLA because c is not a constant expression.
>>
>>
>> But this is not enough to convince me because it is better not to be a 
>> VLA here.
>>
> 
> What practical difference would it make?  

I don't see any practical difference. In theory, the generated code 
could be different, but I'm arguing that this doesn't really matter and, 
consequently, it's not a good reason to differentiate between const and 
constexpr.