[Boost-bugs] [Boost C++ Libraries] #1555: When BOOST_HASH_NO_EXTENSIONS is defined hash doesn't support boost::system::error_code

Subject: [Boost-bugs] [Boost C++ Libraries] #1555: When BOOST_HASH_NO_EXTENSIONS is defined hash doesn't support boost::system::error_code
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2008-01-06 12:12:34

#1555: When BOOST_HASH_NO_EXTENSIONS is defined hash doesn't support
boost::system::error_code
--------------------------+-------------------------------------------------
 Reporter:  danieljames   |       Owner:  danieljames
     Type:  Bugs          |      Status:  new        
Milestone:  Boost 1.36.0  |   Component:  hash       
  Version:  Boost 1.34.1  |    Severity:  Problem    
 Keywords:                |  
--------------------------+-------------------------------------------------
 std::hash supports std::error_code so boost::hash should support
 boost::system::error_code. Boost.System defined 'hash_value' so when
 BOOST_HASH_NO_EXTENSIONS is not defined it does, but when
 BOOST_HASH_NO_EXTENSIONS is defined an explicit specialization is needed.
 Documentation should be added as well.

 I'd actually prefer not to do this as it would mean either declaring
 boost::system::error_code myself or adding a dependency on Boost.System.
 Neither of which is desirable.

 The other solution would be to remove support for the
 BOOST_HASH_NO_EXTENSIONS macro. Or to just note the problem.

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/1555>
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