Re: [Boost-bugs] [Boost C++ Libraries] #11631: boost chrono io v2 does not let you support custom clocks

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11631: boost chrono io v2 does not let you support custom clocks
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2015-09-10 17:47:11

#11631: boost chrono io v2 does not let you support custom clocks
--------------------------------------------------+----------------------
  Reporter:  Sébastien Barthélémy <barthelemy@…>  |      Owner:  viboes
      Type:  Bugs                                 |     Status:  assigned
 Milestone:  Boost 1.60.0                         |  Component:  chrono
   Version:  Boost 1.58.0                         |   Severity:  Problem
Resolution:                                       |   Keywords:
--------------------------------------------------+----------------------
Changes (by viboes):

 * milestone:  To Be Determined => Boost 1.60.0

Comment:

 I think that I have found a way the user can customize the Clock string. I
 don't know however how it can customize it depending on a specific locale.

 The trick is to use an indirection


 {{{
       template <typename Clock>
       string_type get_epoch() const
       {
         return get_epoch_custom<CharT>(Clock(), *this);
       }
 }}}


 where get_epoch_custom just forwards again to the facet.


 {{{
     template <typename CharT, typename Clock, typename TPUFacet>
     std::basic_string<CharT> get_epoch_custom(Clock, TPUFacet& f)
     {
       return f.do_get_epoch(Clock());
     }
 }}}


 The user can specialize its onw Clock by overloading this customization
 function.


 {{{
 template <typename CharT, typename TPUFacet>
 std::basic_string<CharT> get_epoch_custom(MyMillenniumClock, TPUFacet&)
 {
   return boost::chrono::clock_string<MyMillenniumClock,CharT>::since();
 }
 }}}


 Committed in master branch
 https://github.com/boostorg/chrono/commit/533851116fa2c3870e05d878a9cc9c82c4b93fa1

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11631#comment:2>
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