[Boost-bugs] [Boost C++ Libraries] #12963: boost::time_period::span() returns invalid period if one of the periods is not-a-date-time

Subject: [Boost-bugs] [Boost C++ Libraries] #12963: boost::time_period::span() returns invalid period if one of the periods is not-a-date-time
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-04-12 11:32:50

#12963: boost::time_period::span() returns invalid period if one of the periods is
not-a-date-time
-------------------------------+------------------------
 Reporter:  willi.burkhardt@…  |      Owner:  az_sw_dude
     Type:  Bugs               |     Status:  new
Milestone:  To Be Determined   |  Component:  date_time
  Version:  Boost 1.62.0       |   Severity:  Problem
 Keywords:  time_period span   |
-------------------------------+------------------------
 In some cases, the time_period::span() function returns a less than
 optimal result.
 The expected behavior is that if one of the two periods is invalid/not-a
 -date-time the other is returned.

 What I observed is that if one of the two source periods is not-a-date-
 time, the length() of the period returned is wrong/broken; invalidating
 the resulting time_period.

 I might be wrong with my expectation above, but in this case it should be
 at least documented. Attached is a global function that I use to "fix" it
 in my code.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12963>
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