-extern const char *isupport_intptr(void *);
-extern const char *isupport_boolean(void *);
-extern const char *isupport_string(void *);
-extern const char *isupport_stringptr(void *);
+extern const char *isupport_intptr(const void *);
+extern const char *isupport_boolean(const void *);
+extern const char *isupport_string(const void *);
+extern const char *isupport_stringptr(const void *);