ACE_Hashable Class Reference

ACE_Hashable. More...

#include <Hashable.h>

Inheritance diagram for ACE_Hashable:

[legend]List of all members.

Public Member Functions
virtual	~ACE_Hashable (void)
	Destructor.
virtual unsigned long	hash (void) const
Protected Member Functions
	ACE_Hashable (void)
	Protected constructor.
virtual unsigned long	hash_i (void) const =0
Protected Attributes
unsigned long	hash_value_
	Pre-computed hash-value.

---

Detailed Description

ACE_Hashable.

Definition at line 31 of file Hashable.h.

---

Constructor & Destructor Documentation

virtual ACE_Hashable::~ACE_Hashable

(

void

)

[virtual]

Destructor.

ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE ACE_Hashable::ACE_Hashable

(

void

)

[protected]

Protected constructor.

Definition at line 9 of file Hashable.inl.

  : hash_value_ (0)
{
}

---

Member Function Documentation

unsigned long ACE_Hashable::hash

(

void

)

const [virtual]

Computes and returns hash value. This "caches" the hash value to improve performance.

Definition at line 22 of file Hashable.cpp.

References hash_i(), and hash_value_.

{
  // 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_;
}

virtual unsigned long ACE_Hashable::hash_i

(

void

)

const [protected, pure virtual]

This is the method that actually performs the non-cached hash computation.

Implemented in ACE_Refcounted_Hash_Recyclable< T >.

Referenced by hash().

---

Member Data Documentation

unsigned long ACE_Hashable::hash_value_ [mutable, protected]

Pre-computed hash-value.

Definition at line 53 of file Hashable.h.

Referenced by hash().

---

The documentation for this class was generated from the following files:

• Hashable.h
• Hashable.cpp
• Hashable.inl

---