Snprintf and swprintf are not equivalent, because with swprintf we cannot
determine the size to allocate to the resulting formatted string.

Swprintf doesn't accept nullptr as an output argument, nor does it return
the total expected size. We have to allocate buffer of increasing size and
hope that the formatting sting and arguments are valid.
https://stackoverflow.com/a/46289793/3412316


Le jeu. 17 nov. 2022, 21:24, Jens Maurer <jens.maurer_at_[hidden]> a écrit :

>
>
> On 17/11/2022 21.04, Nicolas M via Std-Discussion wrote:
> > Sure you can use streams to format std::wstring, but it is a different
> feature.
> >
> > Emulation of snwprintf in our programs results in inefficient code, I
> think the standard library should be symmetric and contain both snprintf
> and snwprintf.
>
> snwprintf is spelled swprintf
>
> Jens
>
>
> >
> > Le jeu. 17 nov. 2022, 20:35, William Linkmeyer <wlink10_at_[hidden]
> <mailto:wlink10_at_[hidden]>> a écrit :
> >
> > std::wcout
> >
> > WL
> >
> >> On Nov 17, 2022, at 8:39 AM, Nicolas M via Std-Discussion <
> std-discussion_at_[hidden] <mailto:std-discussion_at_[hidden]>>
> wrote:
> >>
> >> 
> >> Hello,
> >>
> >> While porting some Microsoft C++ code to the Linux platform, I have
> realized that while there is snprintf() function for std::string, there is
> no direct equivalent for std::wstring.
> >>
> >> Do you think such a function could be added to the standard? It
> would make std::wstring a more viable alternative to std::string.
> >>
> https://stackoverflow.com/questions/4107947/how-to-determine-buffer-size-for-vswprintf-under-linux-gcc
> <
> https://stackoverflow.com/questions/4107947/how-to-determine-buffer-size-for-vswprintf-under-linux-gcc
> >
> >>
> https://stackoverflow.com/questions/3693479/why-does-c-not-have-an-snwprintf-function
> <
> https://stackoverflow.com/questions/3693479/why-does-c-not-have-an-snwprintf-function
> >
> >>
> >> On the other hand, with Windows starting to support UTF-8 programs
> as of 2019 (and UTF-8 std::string), std::string might become a simple way
> to store unicode text in cross-platform programs.
> >>
> https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page
> <
> https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page
> >
> >>
> >> Best Regards
> >> --
> >> Std-Discussion mailing list
> >> Std-Discussion_at_[hidden] <mailto:
> Std-Discussion_at_[hidden]>
> >> https://lists.isocpp.org/mailman/listinfo.cgi/std-discussion <
> https://lists.isocpp.org/mailman/listinfo.cgi/std-discussion>
> >
> >
>