[llvm-dev] 'cl::opt' and range checking

[ORiordan, Martin via llvm-dev]

Thanks Zachary,

That’s seems like the best approach; it is certainly useful from time-to-time and makes sense that checking for out-of-range is in a shared reusable component.

All the best,

            MartinO

From: Zachary Turner [mailto:zturner at google.com]
Sent: Wednesday, October 4, 2017 4:55 AM
To: ORiordan, Martin <martin.oriordan at intel.com>; llvm-dev <llvm-dev at lists.llvm.org>
Subject: Re: [llvm-dev] 'cl::opt' and range checking

I don't think this is currently supported by `cl::opt`, but you can probably write your own adapter class so that you could write `cl::opt<cl::range<int,3,7>>`.

You'd just need to write a parser for `cl::range` and do the checking in there.  Seems like a useful patch, I've needed this from time to time myself.

On Tue, Oct 3, 2017 at 6:24 AM ORiordan, Martin via llvm-dev <llvm-dev at lists.llvm.org<mailto:llvm-dev at lists.llvm.org>> wrote:
Hi LLVM-Devs,

The LLVM ‘cl::opt’ templates are really useful, and provide a lot of flexibility.  But I don’t see any support for ranged options.  What I would like is to have an option which is an integer type, and to restrict the set of values provided to a simple upper and lower bound, for example between 10 and 2000.

Is there a way of expressing this with the ‘cl::opt’ templates, or do I have to explicitly range check the values in my own code and issue a diagnostic or clamp as appropriate?

Thanks,

            MartinO


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