+ ULONGEST m_tid;
+};
+
+/* Functor to hash a ptid. */
+
+struct hash_ptid
+{
+ size_t operator() (const ptid_t &ptid) const
+ {
+ std::hash<long> long_hash;
+
+ return (long_hash (ptid.pid ())
+ + long_hash (ptid.lwp ())
+ + long_hash (ptid.tid ()));
+ }