- ADD a macro OM_HAS_HASH in the config file.

- Based on the macro provide partial specializations for std::hash<>
- for vertex,halfede,edge, and face handles.
- Add a free function hash_value(BaseHandle) for boost::unordered_set/map

src/OpenMesh/Core/System/config.h

@@ -101,6 +101,11 @@
 #endif
 
 typedef unsigned int uint;
+
+#if (_MSC_VER >= 1900 || __cplusplus > 199711L || defined(__GXX_EXPERIMENTAL_CXX0X__))
+#define OM_HAS_HASH
+#endif
+
 //=============================================================================
 #endif // OPENMESH_CONFIG_H defined
 //=============================================================================