Re: [Cppcms-users] Register textdomains at runtime

[Artyom <art...@ya...>]

> 
> Ok, in  meantime I found the locale::generator::add_messages_domain()  and
> set_default_messages_domain(), but that raised a few more  questions:
> 
> - - Is it possible to remove a message domain again? (But only  one and not
> all message domains, so the clear_domains() method is not what I  want)

No, you can't. At least in current API.

> - - Can I select the domain to use for basic_format::format  or
> locale::translate at method call somehow or do I have to  call
> set_default_messages_domain() on generator beforehand?

Yes you can, read this:

<http://cppcms.sourceforge.net/boost_locale/html/tutorial.html#6f4922f45568161a8cdf4ad2299f6d23>


You need to use iostream manipulator booster::locale::as::domain("name")
to switch domain in the stream.

> If this is  the
> case, is this thread safe, so that I can change  the
> default_messages_domain even to different values for parallel  requests?
> 

It is not safe, actually access of any non-const member function
of booster::locale::generator is not thread safe from multiple
threads, see 

<http://cppcms.sourceforge.net/boost_locale/html/classboost_1_1locale_1_1generator.html>


However, you can always create a separate instance of 
booster::locale::generator,
create locale and install it using

http://art-blog.no-ip.info/cppcms_ref_v0_99/classcppcms_1_1http_1_1context.html#9d6ee6ce1d9007ba1c0d7222fa022fd8


Please note, loading dictionaries and creating locale objects
may be quite heavy operation, so use it very carefully.

You may cache such custom locales withing your cppcms::application derived class
that is cached in pool and not created frequently.

Artyom