dep/ACE_wrappers/ace/Hashable.cpp

   1 //$Id: Hashable.cpp 80826 2008-03-04 14:51:23Z wotte $
   2
   3 #include "ace/Hashable.h"
   4
   5 #if !defined (__ACE_INLINE__)
   6 #include "ace/Hashable.inl"
   7 #endif /* __ACE_INLINE __ */
   8
   9
  10 ACE_RCSID (ace,
  11            Hashable,
  12            "$Id: Hashable.cpp 80826 2008-03-04 14:51:23Z wotte $")
  13
  14
  15 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  16
  17 ACE_Hashable::~ACE_Hashable (void)
  18 {
  19 }
  20
  21 unsigned long
  22 ACE_Hashable::hash (void) const
  23 {
  24   // In doing the check below, we take chance of paying a performance
  25   // price when the hash value is zero.  But, that will (hopefully)
  26   // happen far less often than a non-zero value, so this caching
  27   // strategy should pay off, esp. if hash computation is expensive
  28   // relative to the simple comparison.
  29
  30   if (this->hash_value_ == 0)
  31     this->hash_value_ = this->hash_i ();
  32
  33   return this->hash_value_;
  34 }
  35
  36 ACE_END_VERSIONED_NAMESPACE_DECL