Re: [Boost-users] i18n (and program_options)

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-04-24 05:59:30

Christoph Duelli wrote:

> Hi,
> 
> I am using spirit and program_options so far.
> When Boost.Program_options fails to parse some command line options it
> throws an exception (which is fine). So far, I write (if e is such an
> exception) e.what() to stderr. An obvious example of the the output I get
> is 'unknown option ...'
> 
> I would like to present my users a text in their own language (i.e.
> german). Does Boost or Boost.Program_options support i18n? If yes, how can
> I set the language to use?
> (Or is the intended use to catch the exception, analyze it and produce my
> own translation?)

Hi Christoph,
unfortunately, there's no standard solution in Boost for that. IMO, the
right solution would be for all libraries to throw exceptions like this:

    throw ........ boost::format(boost::i18n("error %1") % error_code));

and boost::i18n to be no-op, but allow the user to provide its own hook:

  boost::set_i18n_hook(&gettext_i18n);

Unfortunately, it might require a lot of discussion to settle on *any*
boost-wide solution. If you're interested to start such discussion, try
posting to developer's list.

- Volodya