1 files changed, 36 insertions, 0 deletions
diff --git a/ACE/ace/Hashable.cpp b/ACE/ace/Hashable.cpp
new file mode 100644
index 00000000000..cab51f7aa26
--- /dev/null
+++ b/ACE/ace/Hashable.cpp
@@ -0,0 +1,36 @@
+//$Id$
+
+#include "ace/Hashable.h"
+
+#if !defined (__ACE_INLINE__)
+#include "ace/Hashable.inl"
+#endif /* __ACE_INLINE __ */
+
+
+ACE_RCSID (ace,
+           Hashable,
+           "$Id$")
+
+
+ACE_BEGIN_VERSIONED_NAMESPACE_DECL
+
+ACE_Hashable::~ACE_Hashable (void)
+{
+}
+
+unsigned long
+ACE_Hashable::hash (void) const
+{
+  // In doing the check below, we take chance of paying a performance
+  // price when the hash value is zero.  But, that will (hopefully)
+  // happen far less often than a non-zero value, so this caching
+  // strategy should pay off, esp. if hash computation is expensive
+  // relative to the simple comparison.
+
+  if (this->hash_value_ == 0)
+    this->hash_value_ = this->hash_i ();
+
+  return this->hash_value_;
+}
+
+ACE_END_VERSIONED_NAMESPACE_DECL