1 files changed, 41 insertions, 0 deletions
diff --git a/src/util/hash.h b/src/util/hash.h
new file mode 100644
index 000000000..d5abeff5a
--- /dev/null
+++ b/src/util/hash.h
@@ -0,0 +1,41 @@
+/** @file
+ * Hash function for various things
+ */
+/* Authors:
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2009 Authors
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#ifndef SEEN_UTIL_HASH_H
+#define SEEN_UTIL_HASH_H
+
+#include <boost/shared_ptr.hpp>
+
+namespace std {
+namespace tr1 {
+
+/** Hash function for Boost shared pointers */
+template <typename T>
+struct hash< boost::shared_ptr<T> > : public std::unary_function<boost::shared_ptr<T>, size_t> {
+    size_t operator()(boost::shared_ptr<T> p) const {
+        return reinterpret_cast<size_t>(p.get());
+    }
+};
+
+} // namespace tr1
+} // namespace std
+
+#endif
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :