ACE/ace/Hashable.cpp

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