Re: [Libmesh-users] GetPot interface with UTF-8?

[John P. <jwp...@gm...>]

On Thu, Apr 29, 2021 at 4:50 PM edgar <edg...@cr...> wrote:

> Dear list,
>
> I noticed that if I have a GetPot file such as:
>
> ┌────
> │ [./ó]
> │     val = 1
> │ [../]
> └────
>
> , that my program would crash. As soon as I change `ó' by `o', it works
> fine. This makes me think that the crash arises because of this line in
> getpot.h
>
> ┌────
> │ str += getpot_cast_int<char>(tmp);
> └────
>
> which is #define'd in getpot.h
>
> ┌────
> | #define getpot_cast_int libMesh::cast_int
> └────
>
> and goes back to libmesh_common.h
>
> ┌────
> │ template <typename Tnew, typename Told>
> │ inline Tnew cast_int (Told oldvar)
> │ {
> │   libmesh_assert_equal_to
> │     (oldvar, static_cast<Told>(static_cast<Tnew>(oldvar)));
> │
> │   return(static_cast<Tnew>(oldvar));
> │ }
> └────
>
> It seems that only int-equivalent (i.e. 8-bit) characters are allowed in
> the GetPot file, is that correct? Is there support for UTF-x? (x: a
> number base, e.g. 8, 16, etc.)
>

Yeah, I think you've pretty well shown that GetPot only supports ASCII
files. I actually don't know how hard it would be to generalize it to use
wchar or something, but the next problem would be that libmesh itself uses
only std::strings everywhere, so updating GetPot would likely only be the
tip of the iceberg of changes that would be required to fully support UTF-8.

-- 
John