+// see comment in wx/hashmap.h which also applies to different standard hash
+// set classes
+
+#if wxUSE_STL && \
+ (defined(HAVE_STD_UNORDERED_SET) || defined(HAVE_TR1_UNORDERED_SET))
+
+#if defined(HAVE_STD_UNORDERED_SET)
+ #include <unordered_set>
+ #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
+ typedef std::unordered_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME
+#elif defined(HAVE_TR1_UNORDERED_SET)
+ #include <tr1/unordered_set>
+ #define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
+ typedef std::tr1::unordered_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME
+#else
+#error Update this code: unordered_set is available, but I do not know where.
+#endif
+
+#elif wxUSE_STL && defined(HAVE_STL_HASH_MAP)
+
+#if defined(HAVE_EXT_HASH_MAP)
+ #include <ext/hash_set>
+#elif defined(HAVE_HASH_MAP)
+ #include <hash_set>
+#endif
+
+#define _WX_DECLARE_HASH_SET( KEY_T, HASH_T, KEY_EQ_T, CLASSNAME, CLASSEXP )\
+ typedef WX_HASH_MAP_NAMESPACE::hash_set< KEY_T, HASH_T, KEY_EQ_T > CLASSNAME
+
+#else // !wxUSE_STL || !defined(HAVE_STL_HASH_MAP)
+