[Dune] [#1121] Illegal forward declaration of std::pair in mpitraits.hh (Attachment added)

[Dune]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Steffen Müthing (smuething) 

Attached to Project - Dune
Summary - Illegal forward declaration of std::pair in mpitraits.hh
Task Type - Bug Report
Category - Common
Status - New
Assigned To - 
Operating System - Unspecified / All
Severity - Medium
Priority - Normal
Reported Version - SVN (pre2.3)
Due in Version - 2.3
Due Date - Undecided
Details - mpitraits.hh forward declares std::pair, which is illegal by the standard (it is not allowed to forward declare any members of namespace std), and clang (more precisely: its standard library implementation) stumbles over that.

The attached patch fixes the problem by including <utility> and dropping the forward declaration.

One or more files have been attached.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1121

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