220 37306 article Path: news.gmane.org!.POSTED!not-for-mail From: Miguel Ojeda Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Re: More compact #include statement. 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[209.85.220.65]) by mx.google.com with SMTPS id u19sor3527514qke.31.2018.03.11.11.41.24 for (Google Transport Security); Sun, 11 Mar 2018 11:41:24 -0700 (PDT) Received-SPF: pass (google.com: domain of miguel.ojeda.sandonis@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; X-Received: by 10.233.237.2 with SMTP id c2mr7769751qkg.54.1520793684052; Sun, 11 Mar 2018 11:41:24 -0700 (PDT) Original-Received: by 10.200.52.247 with HTTP; Sun, 11 Mar 2018 11:41:03 -0700 (PDT) In-Reply-To: X-Original-Sender: miguel.ojeda.sandonis@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=LDKS0Y6z; spf=pass (google.com: domain of miguel.ojeda.sandonis@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=miguel.ojeda.sandonis@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:37306 Archived-At: On Sun, Mar 11, 2018 at 7:47 PM, Larry Evans wrote: > On 03/11/2018 12:20 PM, Todd Fleming wrote: >> >> On Sunday, March 11, 2018 at 1:12:48 PM UTC-4, Larry Evans wrote: >>> >>> >>> OK, to be more explicit: >>> >>> There's no *semantic* difference between: >>> >>> import os >>> import sys >>> >>> and: >>> >>> import os,sys >>> >>> >> Python has a very unique culture, one that values DRY more than any >> community I'm aware of. Yet the Python community, the high priests of DRY, >> don't buy your argument. >> > > You're misunderstanding my viewpoint. My OP said: > > To me, although it violates DRY, the `one XXX per line` guide > clarifies code. > > Thus I was *advocating* the "one XXX per line": > > import os > import sys > > I mentioned the DRY principle *solely* to provide a possible > justification for the "multiple XXX per line": > > import os,sys > > method. Personally, I find the "multiple XXX per line": > > SomeType a_scalar, *a_ptr, a_vec[5]; I typically only find that style useful in the init statement of for loops to declare a logically constant end variable in a for loop, whenever one has to be sure it is not re-evaluated every iteration, i.e: for (int i = 0, iEnd = get_size(); i < iEnd; ++i) { ... } And even in that case, if it is anything non-trivial, I usually prefer to just keep it in the previous line as a proper const variable. So the only real benefit of the style is the lifetime reduction/scope pollution for trivial cases. For normal variable declarations, having only per line not only improves readability (specially for complex types, i.e. C++), but also allows you to have straightforward patches/diffs, i.e.: @@ -1,5 +1,6 @@ #include #include +#include #include #include vs. @@ -1,2 +1,2 @@ -#include +#include Same applies for C/C++ #includes and Python imports. Cheers, Miguel -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CANiq72%3DfF3%3DNRpKjGSF_BEu4sfDKxU_1kDe9e-%3DVTx%3DBZ6H%3DCA%40mail.gmail.com. .