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Diffstat (limited to 'ACE/ace/Hashable.h')
-rw-r--r-- | ACE/ace/Hashable.h | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/ACE/ace/Hashable.h b/ACE/ace/Hashable.h new file mode 100644 index 00000000000..d20bb2da1aa --- /dev/null +++ b/ACE/ace/Hashable.h @@ -0,0 +1,65 @@ +// -*- C++ -*- + +//============================================================================= +/** + * @file Hashable.h + * + * $Id$ + * + * @author Doug Schmidt + */ +//============================================================================= + +#ifndef ACE_HASHABLE_H +#define ACE_HASHABLE_H + +#include /**/ "ace/pre.h" + +#include /**/ "ace/ACE_export.h" + +#if !defined (ACE_LACKS_PRAGMA_ONCE) +# pragma once +#endif /* ACE_LACKS_PRAGMA_ONCE */ + +ACE_BEGIN_VERSIONED_NAMESPACE_DECL + +/** + * @class ACE_Hashable + * + * @brief ACE_Hashable + */ +class ACE_Export ACE_Hashable +{ +public: + + /// Destructor. + virtual ~ACE_Hashable (void); + + /// Computes and returns hash value. This "caches" the hash value to + /// improve performance. + virtual unsigned long hash (void) const; + +protected: + /// Protected constructor. + ACE_Hashable (void); + + /// This is the method that actually performs the non-cached hash + /// computation. + virtual unsigned long hash_i (void) const = 0; + +protected: + + /// Pre-computed hash-value. + mutable unsigned long hash_value_; + +}; + +ACE_END_VERSIONED_NAMESPACE_DECL + +#if defined (__ACE_INLINE__) +#include "ace/Hashable.inl" +#endif /* __ACE_INLINE __ */ + +#include /**/ "ace/post.h" + +#endif /*ACE_HASHABLE_H*/ |