id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6960	unnecessary dependency on boost.date_time when building with separate compilation	arvid@…	chris_kohlhoff	"The time_queue.hpp header file, in addition to defining the template, also defines one instantiation of it using boost::posix_time::ptime as the time type. This instantiation is then implemented in impl/timer_queue.ipp. This definition is only visible when building asio with the separate compilation option.

If a client never uses the date_time ptime type, nor its clock, this results in an unnecessary dependency on boost.date_time (at least on windows, possibly because the gregorian::date_type constructor needs to be resolved at link-time). Simply commenting the extra instantiation solves the problem (i.e. removes the dependency on boost.date_time).

I would suggest simply removing this explicit instantiation of the timer_queue template when building with separate compilation. From what I can tell, that would not cause any serious problems for any other use. Building with headers-only would not be affected at all, and building with separate compilation and actually using the boost::posix_time::ptime time_trait, it would just be instantiated automatically anyway, just like when using headers-only.

I marked this as boost 1.46.0 because that's what I'm testing with on windows., but from what I can tell, this is still a problem in 1.49.0, since timer_queue_ptime.hpp is included in src.hpp"	Bugs	closed	To Be Determined	asio	Boost 1.46.0	Problem	wontfix