[llvm-dev] Coding standards: duplicating method comments?

David Chisnall via llvm-dev llvm-dev at lists.llvm.org
Wed Jan 31 02:37:59 PST 2018

On 30 Jan 2018, at 19:56, Alex Bradbury via llvm-dev <llvm-dev at lists.llvm.org> wrote:
> Is this bad style? It seems the current codebase is inconsistent on
> this point. The upside of such duplication is that it reduces the need
> to cross-reference to other files when using a dumb editor.

I generally use the rendered docs on the LLVM web site when using a dumb editor, so haven’t found this to be a problem.

> The
> disadvantage is that duplicated comments add maintenance burden just
> like duplicated code.

Indeed.  It can lead to stale comments if the subclass is not updated when the superclass is.  I also find these comments misleading: if an overridden method has a comment, I expect it to tell me what is different between this and the superclass’ definition (i.e. what I, as a caller of this method, should be aware of if I call this version and not the superclass version).  If it is just the superclass’s definition applied to the subclass, then a comment is confusing.


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