[boost] date_time: 2 time_durations?

[David Abrahams]

This is causing an ambiguity:

  using namespace boost::date_time;
  using namespace boost::posix_time;
  time_duration since_1970 = d - 1/Jan/1970;

The error was:

  DateField.cpp
  DateField.cpp(36) : error C2872: 'time_duration' : ambiguous symbol

          could be
          'c:\boost\boost\date_time\posix_time\posix_time_config.hpp(60)
          : boost::posix_time::time_duration'

          or       'c:\boost\boost\date_time\time_duration.hpp(166) :
          boost::date_time::time_duration'


Is it really right for us to have two time_durations?  I never
expected this since boost::date_time::time_duration is nowhere
documented.

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com

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