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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>