calchash(): work around broken RTTI.

[ginac.git] / ginac / idx.cpp

diff --git a/ginac/idx.cpp b/ginac/idx.cpp
index c2565cada43947822d37de3a396e213948273e8d..d1a9c49a69faded1a2f8beb956757412b350af89 100644 (file)
--- a/ginac/idx.cpp
+++ b/ginac/idx.cpp
@@ -27,6 +27,7 @@
 #include "operators.h"
 #include "archive.h"
 #include "utils.h"
+#include "hash_seed.h"
 
 #include <iostream>
 #include <sstream>
@@ -350,8 +351,7 @@ unsigned idx::calchash() const
        // hash keys. That is, the hash values must not depend on the index
        // dimensions or other attributes (variance etc.).
        // The compare_same_type() methods will take care of the rest.
-       const void* this_tinfo = (const void*)(typeid(*this).name());
-       unsigned v = golden_ratio_hash((p_int)this_tinfo);
+       unsigned v = make_hash_seed(typeid(*this));
        v = rotate_left(v);
        v ^= value.gethash();