| # Gaudi Framework, version v22r4 |

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# KeyedObject< KEY > Class Template Reference

Definition of the templated KeyedObject class. More...

`#include <KeyedObject.h>`

Inheritance diagram for KeyedObject< KEY >:
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Collaboration diagram for KeyedObject< KEY >:
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List of all members.

## Public Types
typedef KEY | key_type
| Definition of the key-type to access object.
## Public Member Functions
| KeyedObject ()
| Standard Constructor. The object key is preset to the invalid value.
| KeyedObject (const key_type &kval)
| Standard Constructor accepting the object's key.
virtual | ~KeyedObject ()
| Standard destructor.
const key_type & | key () const
| Retrieve Key of the object.
bool | hasKey () const
| Check if the object has a key assigned or not.
virtual long | index () const
| Distance in the parent container.
virtual StreamBuffer & | serialize (StreamBuffer &s) const
| Serialize the object for writing.
virtual StreamBuffer & | serialize (StreamBuffer &s)
| Serialize the object for reading.
## Protected Types
typedef Containers::key_traits < key_type > | traits
| definition of the container key traits to be made friend
## Protected Member Functions
unsigned long | addRef ()
| Add reference to object (Increase reference counter).
unsigned long | release ()
| Release reference. If the reference count is ZERO, delete the object.
void | setKey (const key_type &key)
| Set object key.
## Protected Attributes
key_type | m_key
| Object Key; It's initial value is not determined.
long | m_refCount
| Reference counter.
bool | m_hasKey
| Boolean to indicate wether a key was already assigned.
## Private Member Functions
| KeyedObject (const KeyedObject &copy)
| NOBODY may copy these objects.
## Friends
struct | GaudiDict::KeyedObjectDict< KEY >
struct | Containers::key_traits< key_type >
| Allow the container traits to access full object properties.

## Detailed Description

### template<class KEY>
class KeyedObject< KEY >

Definition of the templated KeyedObject class.

This object, which is of the basic containedObject type allows to be identified by key.

This implementation uses a reference count mechanism for insertion into multiple containers; Once the reference count is NULL, the object will automatically be deleted.

Author:
  M.Frank CERN/LHCb

Version:
  1.0

Definition at line 28 of file KeyedObject.h.

## Member Typedef Documentation

template<class KEY >

typedef KEY KeyedObject< KEY >::key_type

Definition of the key-type to access object.

Definition at line 32 of file KeyedObject.h.

template<class KEY >

typedef Containers::key_traits<key_type> KeyedObject< KEY >::traits`[protected]`

definition of the container key traits to be made friend

Definition at line 36 of file KeyedObject.h.

## Constructor & Destructor Documentation

template<class KEY >

KeyedObject< KEY >::KeyedObject | ( | ) | `[inline]`

Standard Constructor. The object key is preset to the invalid value.

Definition at line 61 of file KeyedObject.h.

    : m_key(), m_refCount(0), m_hasKey(false) {                     }

template<class KEY >

KeyedObject< KEY >::KeyedObject | ( | const key_type & | kval ) | `[inline]`

Standard Constructor accepting the object's key.

The key must be valid and cannot be changed later.

Definition at line 65 of file KeyedObject.h.

    :m_key(kval),m_refCount(0),m_hasKey(true) { }

template<class KEY >

KeyedObject< KEY >::~KeyedObject | ( | ) | `[inline, virtual]`

Standard destructor.

Definition at line 91 of file KeyedObject.h.

    {
      ObjectContainerBase* p = const_cast<ObjectContainerBase*>(parent());
      if ( p )  {
        setParent(0);
        p->remove(this);
      }
    }

template<class KEY >

KeyedObject< KEY >::KeyedObject | ( | const KeyedObject< KEY > & | copy ) | `[inline, private]`

NOBODY may copy these objects.

Definition at line 79 of file KeyedObject.h.

    : ContainedObject(copy) {               }

## Member Function Documentation

template<class KEY >

unsigned long KeyedObject< KEY >::addRef | ( | ) | `[inline, protected]`

Add reference to object (Increase reference counter).

Definition at line 102 of file KeyedObject.h.

                                           {
      return ++m_refCount;
    }

template<class KEY >

bool KeyedObject< KEY >::hasKey | ( | ) | const`[inline]`

Check if the object has a key assigned or not.

Definition at line 71 of file KeyedObject.h.

    {                     return m_hasKey; }

template<class KEY >

virtual long KeyedObject< KEY >::index | ( | ) | const`[inline, virtual]`

Distance in the parent container.

Reimplemented from ContainedObject.

Definition at line 72 of file KeyedObject.h.

    {    return traits::identifier(m_key); }

template<class KEY >

const key_type& KeyedObject< KEY >::key | ( | ) | const`[inline]`

Retrieve Key of the object.

Definition at line 69 of file KeyedObject.h.

    {                     return m_key;    }

template<class KEY >

unsigned long KeyedObject< KEY >::release | ( | ) | `[inline, protected]`

Release reference. If the reference count is ZERO, delete the object.

Definition at line 108 of file KeyedObject.h.

                                            {
      long cnt = --m_refCount;
      if ( cnt <= 0 )  {
        delete this;
      }
      return cnt;
    }

template<class KEY >

StreamBuffer & KeyedObject< KEY >::serialize | ( | StreamBuffer & | s ) | `[inline, virtual]`

Serialize the object for reading.

Reimplemented from ContainedObject.

Definition at line 138 of file KeyedObject.h.

                                                               {
      long k;
      ContainedObject::serialize(s) >> k;
      m_key = traits::makeKey(k);
      m_hasKey = true;
      return s;
    }

template<class KEY >

StreamBuffer & KeyedObject< KEY >::serialize | ( | StreamBuffer & | s ) | const`[inline, virtual]`

Serialize the object for writing.

Reimplemented from ContainedObject.

Definition at line 132 of file KeyedObject.h.

                                                                     {
      return ContainedObject::serialize(s) << traits::identifier(m_key);
    }

template<class KEY >

void KeyedObject< KEY >::setKey | ( | const key_type & | key ) | `[inline, protected]`

Set object key.

The key for consistency reasons can be set only once for the object. Any attempt to redefine the key results in an exception.

Definition at line 121 of file KeyedObject.h.

                                                     {
      if ( !m_hasKey )   {
        m_key = key;
        m_hasKey = true;
        return;
      }
      Containers::cannotAssignObjectKey();
    }

## Friends And Related Function Documentation

template<class KEY >

friend struct Containers::key_traits< key_type >`[friend]`

Allow the container traits to access full object properties.

Definition at line 41 of file KeyedObject.h.

template<class KEY >

friend struct GaudiDict::KeyedObjectDict< KEY >`[friend]`

Definition at line 29 of file KeyedObject.h.

## Member Data Documentation

template<class KEY >

bool KeyedObject< KEY >::m_hasKey`[protected]`

Boolean to indicate wether a key was already assigned.

Definition at line 49 of file KeyedObject.h.

template<class KEY >

key_type KeyedObject< KEY >::m_key`[protected]`

Object Key; It's initial value is not determined.

Definition at line 45 of file KeyedObject.h.

template<class KEY >

long KeyedObject< KEY >::m_refCount`[protected]`

Reference counter.

Definition at line 47 of file KeyedObject.h.

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

- /afs/cern.ch/sw/Gaudi/releases/GAUDI/GAUDI_v22r4/GaudiKernel/GaudiKernel/KeyedObject.h

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