Groups > comp.lang.c++ > #119854

Re: General Preference in C++

From	Andrey Tarasevich <andreytarasevich@hotmail.com>
Newsgroups	comp.lang.c++
Subject	Re: General Preference in C++
Date	2024-08-20 20:07 -0700
Organization	A noiseless patient Spider
Message-ID	<va3llv$3nijk$1@dont-email.me> (permalink)
References	<va3fk7$ui68$1@paganini.bofh.team>

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On 08/20/24 6:30 PM, Jack wrote:
> 
> constexpr size_t N = 12;
> #define N 12
> 
> constexpr is modern way of doing things but in terms of efficiency what
> is the best way to do?
> 

There's no difference in efficiency.

One can probably come up with a few reasons to prefer a macro for this 
purpose, like

1. Compatibility with C in cross-compiled header files
2. Ability to use a named constant in subsequent preprocessor directives 
(e.g. `#if`)
3. Probably something else...

But these reasons are focused rather narrowly of some niche 
applications. When you _have_ a choice, there's no reason to avoid 
`constexpr`.

-- 
Best regards,
Andry

Thread

General Preference in C++ Jack <noreply@mandrill.com> - 2024-08-21 01:30 +0000
  Re: General Preference in C++ Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-08-20 18:53 -0700
    Re: General Preference in C++ Chris Ahlstrom <OFeem1987@teleworm.us> - 2024-08-22 13:18 -0400
      Re: General Preference in C++ scott@slp53.sl.home (Scott Lurndal) - 2024-08-22 17:54 +0000
        Re: General Preference in C++ Bonita Montero <Bonita.Montero@gmail.com> - 2024-08-22 20:08 +0200
        Re: General Preference in C++ David Brown <david.brown@hesbynett.no> - 2024-08-23 09:08 +0200
          Re: General Preference in C++ Chris Ahlstrom <OFeem1987@teleworm.us> - 2024-08-23 09:41 -0400
  Re: General Preference in C++ Andrey Tarasevich <andreytarasevich@hotmail.com> - 2024-08-20 20:07 -0700
    Re: General Preference in C++ David Brown <david.brown@hesbynett.no> - 2024-08-21 09:07 +0200
  Re: General Preference in C++ Bonita Montero <Bonita.Montero@gmail.com> - 2024-08-22 11:33 +0200

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