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    5 #if (__GNUC__ >= 4 && __GNUC_MINOR__ >=3) 
    6 #  include <tr1/functional> 
    8 #  include <boost/functional/hash_fwd.hpp> 
   18 #if (__GNUC__ >= 4 && __GNUC_MINOR__ >=3) 
   20     struct hash : 
public std::tr1::hash<T>
 
   25     struct hash : 
public boost::hash<T>