Re: [boost] charconv for C++11

Matt Borland wrote:

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On May 10, 2023, at 5:42 PM, Dominique Devienne wrote:

On Wed, May 10, 2023 at 4:01 PM Matt Borland via Boost wrote:

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[...] We use errno rather than std::error_code as specified in the standard.

Hi. Sounded like a good candidate for Boost.Compat (or Boost.Polyfill), discussed recently, until that sentence. I'm lucky enough to be able to use C++17 at work, but if I was on C++11, I'd tend to use such a library C++until I could use the std one, so deviations like this would complicate adoption because moving to std would then be harder. My $0.02. —DD

Dominique,

Thanks for the response. We discussed Boost.Compat but decided it is outside of the scope. For instance <latch> is what set off the discussion and it can be implemented in ~100 LOC. This implementation of charconv will be around 10k LOC so it should be in its own library. If the demand signal is to use std::error_code instead of errno we can make the change.

boost/charconv.hpp was initially supposed to be a very light header (with only a few declarations), but since from/to_chars for integral types were moved to the headers because of constexpr, that's no longer the case, so we can probably afford the inclusion of without anyone noticing. (Note that std::from/to_chars use std::errc, not std::error_code.)