DBPointer< T, KEY, METHOD, NAME > Class Template Reference

Class for pointing to an element in an array stored in the database. More...

#include <DBPointer.h>

Public Member Functions
	DBPointer (KEY key)
	Constructor of pointer to an array element in the database.
KEY	key () const
	Accessor for key value.
	operator KEY () const
	Accessor for key value.
KEY	operator= (KEY key)
	Setter for key value.
bool	isValid () const
	Check whether we point to a valid object.
	operator bool () const
	Is this pointer's data safe to access?
const T &	operator* () const
	Imitate pointer functionality.
const T *	operator-> () const
	Imitate pointer functionality.

Private Member Functions
const T *	getPointer () const
	Find the referred object and set m_object to it.

Private Attributes
KEY	m_key
	Key value of the referred array element.
const T *	m_object
	Pointer to actual object.

Detailed Description

template<class T, typename KEY, KEY(T::*)() const METHOD, const std::string & NAME = DBPointer_defaultName>
class Belle2::DBPointer< T, KEY, METHOD, NAME >

Class for pointing to an element in an array stored in the database.

Definition at line 24 of file DBPointer.h.

Constructor & Destructor Documentation

DBPointer()

DBPointer ( KEY  key )

inlineexplicit

Constructor of pointer to an array element in the database.

Parameters

key	The key value to identify the element.

Definition at line 31 of file DBPointer.h.

                               :
      m_key(key), m_object(0) {};

Member Function Documentation

getPointer()

const T * getPointer ( ) const

inlineprivate

Find the referred object and set m_object to it.

Definition at line 57 of file DBPointer.h.

    {
      if (!m_object) {
        DBArray<T> array(NAME);
        m_object = array.getByKey(METHOD, m_key);
      }
      return m_object;
    }

isValid()

bool isValid ( ) const

inline

Check whether we point to a valid object.

Returns

True if the object exists.

Definition at line 47 of file DBPointer.h.

{return getPointer();}

key()

KEY key ( ) const

inline

Accessor for key value.

Definition at line 35 of file DBPointer.h.

{return m_key;}

operator bool()

operator bool ( ) const

inline

Is this pointer's data safe to access?

Definition at line 50 of file DBPointer.h.

{return isValid();}

operator KEY()

operator KEY ( ) const

inline

Accessor for key value.

Definition at line 38 of file DBPointer.h.

{return m_key;}

operator*()

const T & operator* ( ) const

inline

Imitate pointer functionality.

Definition at line 52 of file DBPointer.h.

operator->()

const T * operator-> ( ) const

inline

Imitate pointer functionality.

Definition at line 53 of file DBPointer.h.

operator=()

KEY operator= ( KEY  key )

inline

Setter for key value.

Definition at line 41 of file DBPointer.h.

{m_key = key; m_object = 0; return m_key;}

Member Data Documentation

m_key

KEY m_key

private

Key value of the referred array element.

Definition at line 67 of file DBPointer.h.

m_object

const T* m_object

mutableprivate

Pointer to actual object.

Definition at line 70 of file DBPointer.h.

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

• framework/database/include/DBPointer.h