C++ Logo

SG16

Advanced search

Subject: Re: [SG16-Unicode] Convert between std::u8string and std::string
From: Steve Downey (sdowney_at_[hidden])
Date: 2019-05-03 10:32:18


Also keep in mind that without a locale using a multibyte charset, i.e. not
the default "C" locale, conversion will be silently lossy.

On Fri, May 3, 2019, 11:26 Tom Honermann <tom_at_[hidden]> wrote:

> On 5/3/19 7:12 AM, Lyberta wrote:
>
> So GCC 9 has been released and I'm starting migration to char8_t. The
> first question is how to print std::u8string? Since std::cout works in
> execution character set I need a way to convert string from UTF-8 to ECS.
>
> I wish I had a better suggestion for you then std::c8rtomb. JeanHeyd is
> working on a proposal for modern transcoding interfaces.
>
>
>
> It looks like the only way is to use std::c8rtomb but the API is very
> cryptic and I don't understand it. Can someone provide an example code?
>
> As far as I know, no one has actually implemented std::c8rtomb yet. It
> has been on my todo list for a long time to contribute an implementation to
> glibc, but I haven't found the time yet.
>
> c8rtomb is intended to match the existing c16rtomb and c32rtomb functions,
> so inherits design and wording from them. The wording in the C++ standard
> for c8rtomb is a lightly edited copy of the C standard's wording for
> c16rtomb. That wording is, well, it could be improved. A lot. I
> intentionally chose to keep it aligned with the C standard so as not to
> cause confusion for implementors (presumably, they have already come to an
> understanding with C's wording).
>
> I suggest looking at the examples for c16rtomb on cppreference.com.
> - https://en.cppreference.com/w/cpp/string/multibyte/c16rtomb
>
> Tom.
>
>
>
> _______________________________________________
> SG16 Unicode mailing listUnicode_at_[hidden]http://www.open-std.org/mailman/listinfo/unicode
>
>
> _______________________________________________
> SG16 Unicode mailing list
> Unicode_at_[hidden]
> http://www.open-std.org/mailman/listinfo/unicode
>



SG16 list run by herb.sutter at gmail.com