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Subject: Re: [std-proposals] add "numeric_cast" to <numeric> header
From: Charles Milette (charlesmilette_at_[hidden])
Date: 2020-05-15 18:19:58


See also: gsl::narrow and wil::safe_cast

On Fri, May 15, 2020 at 7:09 PM Qingfeng Xia via Std-Proposals
<std-proposals_at_[hidden]> wrote:
>
>
> Dear all,
>
> I hope runtime safe `numeric_cast` can be added to standard library header <numeric>.
>
> The boost library has already got such feature, I wonder if there is already a proposal to merge it into the next standard?
>
> Before I searched and reached Boost::numeric_cast, I reinvented the wheel, together with some other helper functions. More technical details are written in markdown at:
> https://github.com/qingfengxia/cpp_numeric_cast/blob/master/proposal_numeric_cast.md
>
> I have another idea: reuse the `explicit` keyword to prevent implicit conversion of function parameter. https://github.com/qingfengxia/cpp_numeric_cast/blob/master/proposal_explicit.md I am not sure it is the correct maillist to discuss this idea. It proposes to change compiler code-base/hehaviors. Please advise, shall I send another email somewhere else for this idea?
>
> Demo code and implementation are hosted at: https://github.com/qingfengxia/cpp_numeric_cast
>
> Both ideas are at the "Float the idea" stage, all the code and text are in early draft condition. They will be update and improve gradually.
>
> Thank you and looking forwards to feedback.
>
> Yours Sincerely,
>
> Qingfeng Xia
> --
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