dep/ACE_wrappers/ace/Hashable.h

   1 // -*- C++ -*-
   2
   3 //=============================================================================
   4 /**
   5  *  @file   Hashable.h
   6  *
   7  *  $Id: Hashable.h 80826 2008-03-04 14:51:23Z wotte $
   8  *
   9  *  @author Doug Schmidt
  10  */
  11 //=============================================================================
  12
  13 #ifndef ACE_HASHABLE_H
  14 #define ACE_HASHABLE_H
  15
  16 #include /**/ "ace/pre.h"
  17
  18 #include /**/ "ace/ACE_export.h"
  19
  20 #if !defined (ACE_LACKS_PRAGMA_ONCE)
  21 # pragma once
  22 #endif /* ACE_LACKS_PRAGMA_ONCE */
  23
  24 ACE_BEGIN_VERSIONED_NAMESPACE_DECL
  25
  26 /**
  27  * @class ACE_Hashable
  28  *
  29  * @brief ACE_Hashable
  30  */
  31 class ACE_Export ACE_Hashable
  32 {
  33 public:
  34
  35   /// Destructor.
  36   virtual ~ACE_Hashable (void);
  37
  38   /// Computes and returns hash value.  This "caches" the hash value to
  39   /// improve performance.
  40   virtual unsigned long hash (void) const;
  41
  42 protected:
  43   /// Protected constructor.
  44   ACE_Hashable (void);
  45
  46   /// This is the method that actually performs the non-cached hash
  47   /// computation.
  48   virtual unsigned long hash_i (void) const = 0;
  49
  50 protected:
  51
  52   /// Pre-computed hash-value.
  53   mutable unsigned long hash_value_;
  54
  55 };
  56
  57 ACE_END_VERSIONED_NAMESPACE_DECL
  58
  59 #if defined (__ACE_INLINE__)
  60 #include "ace/Hashable.inl"
  61 #endif /* __ACE_INLINE __ */
  62
  63 #include /**/ "ace/post.h"
  64
  65 #endif /*ACE_HASHABLE_H*/