[llvm-dev] Variable names rule

Krzysztof Parzyszek via llvm-dev llvm-dev at lists.llvm.org
Mon Feb 4 12:51:08 PST 2019

On 2/4/2019 2:29 PM, Tim Northover via llvm-dev wrote:
> On Mon, 4 Feb 2019 at 20:21, JD Jones <jjones at prc-hsv.com> wrote:
>> If _<lowerCaseLetter> violates a standard, please say which one. It does not violate the C++11 standard:
> If strictly adhered to, it doesn't, and I've never claimed any
> different. But coding standards are never strictly adhered to.
> Particularly not in a codebase like LLVM which already has a good
> handful in play for historical reasons. We can't expect reviewers to
> be perfect either, and violations of a leading underscore rule have a
> ridiculously high probability of producing malformed C++.
> It's simply not worth the aggro when there are plenty of other
> possibilities available that don't open us up for that failure mode.

IMO, any convention that contains leading or trailing underscores should 
be rejected outright. The primary purpose of a convention is to allow a 
person to differentiate between different kinds of elements with a quick 
glance. It should strive to make these elements appear different without 
sacrificing the readability. Prepending or appending a lone underscore 
is really making the identifier as similar to another one as possible, 
while still making it different from the language standard point of 
view, i.e. the opposite to what a useful convention should do.


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