[Dune] [#578] operator<< in dgfparserblocks.hh causes linking errors

[Dune]

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User who did this - Sven Marnach (sven) 

Attached to Project - Dune
Summary - operator<< in dgfparserblocks.hh causes linking errors
Task Type - Bug Report
Category - DGFParser
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Low
Priority - Normal
Reported Version - SVN
Due in Version - Undecided
Due Date - Undecided
Details - In dgfparserblocks.hh, there is an implicitly extern definition of

std::ostream &operator<< ( std::ostream &out, const PeriodicFaceTransformationBlock::AffineTransformation &trafo )

This definition must either be made static or moved to dgfparserblocks.cc.  The current situation leads to multiple definitions of this operator if the header is used by more than one compilation unit.  (Actually, the header cannot be used at all, since one definition of the operator will go to libdgfparser.)

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=578

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