[Boost-bugs] [Boost C++ Libraries] #7041: time_point.hpp depends on Boost.System

Subject: [Boost-bugs] [Boost C++ Libraries] #7041: time_point.hpp depends on Boost.System
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-06-28 12:51:16

#7041: time_point.hpp depends on Boost.System
-------------------------------------+--------------------------------------
 Reporter:  1czajnik@…               |       Owner:  viboes 
     Type:  Bugs                     |      Status:  new    
Milestone:  To Be Determined         |   Component:  chrono 
  Version:  Boost Development Trunk  |    Severity:  Problem
 Keywords:                           |  
-------------------------------------+--------------------------------------
 Hello,

 Problem:
 The file boost/chrono/time_point.hpp #includes
 <boost/chrono/detail/system.hpp>, and it doesn't appear to need it. This
 creates an unnecessary dependency on Boost.System, even though no clock
 provided by Boost.Chrono is used.

 Proposed solution:
 remove #include <boost/chrono/detail/system.hpp> from
 boost/chrono/time_point.hpp.

 Rationale:
 Suppose I want to create my own clock class, and in it among other things
 I would like to typedef a time_point<...>.


 {{{
 struct MyClock
 {
     typedef int64_t rep;
     typedef boost::milli period;
     typedef boost::chrono::duration<rep,period> duration;
     typedef boost::chrono::time_point<MyClock,duration> time_point;
     static bool const is_steady = false;
     static time_point now();
 };
 }}}

 Now, for this to work it is necessary to #include
 <boost/chrono/time_point.hpp>. Including it causes a dependency on
 Boost.System.

 Cheers,
 Kris

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7041>
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