[boost] [Boost-bugs] [ boost-Bugs-1498778 ] operator<< for gregorian::date_duration not found

From: SourceForge.net (noreply_at_[hidden])
Date: 2006-06-01 07:09:05

Bugs item #1498778, was opened at 2006-06-01 12:09
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Category: date_time
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Zak Kipling (zak-k)
Assigned to: Jeff Garland (az_sw_dude)
Summary: operator<< for gregorian::date_duration not found

Initial Comment:
The operator<< for boost::gregorian::date_duration (aka
gregorian::days) is not found by name lookup. This
appears to be because:

* boost::gregorian::date_duration is a typedef to:

    boost::date_time::date_duration<
boost::gregorian::date_duration_rep >

   where boost::gregorian::date_duration_rep is a
typedef to boost::date_time::duration_traits_adapted

  (defined in date_time/gregorian/greg_duration.hpp)

* operator<< for boost::gregorian::date_duration) is
defined in the gregorian namespace

  (defined in date_time/gregorian/gregorian_io.hpp)

However, since only the typedef names are in the
gregorian namespace, argument-dependent lookup doesn't
 find it there unless you add:

  using gregorian::operator<<;

to your code, after which the operator works as expected.

This occurs for me using both gcc 3.4.5 and 4.0.3, and
both with Boost 1.33.1 and current CVS trunk.

A possible solution would be to either move the
definition of operator<< to the date_time namespace, or
pull it into that namespace with a using declaration.

I haven't checked all the other gregorian types, but
it's possible that similer problems exist.

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