id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7041	time_point.hpp depends on Boost.System	1czajnik@…	viboes	"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"	Bugs	closed	Boost 1.51.0	chrono	Boost Development Trunk	Problem	fixed