diff options
Diffstat (limited to 'ACE/ace/Hashable.cpp')
-rw-r--r-- | ACE/ace/Hashable.cpp | 36 |
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 |