HiddenParam< O, V > Class Template Reference

Workaround manager when you cannot add class members to a class due to binary compability issues. More...

Public Member Functions
	HiddenParam (const V &undefval)
	~HiddenParam ()
void	setParam (O *obj, const V &val)
bool	setParamIfValueIs (O *obj, const V &curval, const V &newval)
const V &	getParam (const O *obj) const
bool	hasParam (const O *obj) const
void	removeParam (O *obj)
void	removeAndDeleteParam (O *obj)
void	deleteAndZeroPtrParam (O *obj)

Protected Attributes
ObjectSet< O >	objects_
TypeSet< V >	params_
Threads::Lock	lock_
V	undef_

Detailed Description

template<class O, class V>
class HiddenParam< O, V >

Workaround manager when you cannot add class members to a class due to binary compability issues.

If you want to add the variable of type V to class O, do the following in the source-file:

HiddenParam<O,V>      myparammanager( undef_val );

You can then access the variable in the source-file by:

myparammanager.setParam( this, new_value );

and retrieve it by

V value = myparammanager.getParam( this );

Note

V cannot be boolean. Use char instead. V must be 'simple' enough to be stored in a type-set. Also note you may not be able to call the removeParam (if the class does not already have a destructor), so so don't use with objects that are created millions of times in those cases, as you will leak memory. Finally, note that you MUST set the parameter in the constructor. The undef value is not ment to be returned, it's merely to keep the compiler happy.

Constructor & Destructor Documentation

template<class O, class V>

HiddenParam< O, V >::HiddenParam ( const V &  undefval )

inline

template<class O , class V >

HiddenParam< O, V >::~HiddenParam

(

)

Member Function Documentation

template<class O , class V >

void HiddenParam< O, V >::deleteAndZeroPtrParam

(

O *

obj

)

template<class O , class V >

const V & HiddenParam< O, V >::getParam

(

const O *

obj

)

const

template<class O , class V >

bool HiddenParam< O, V >::hasParam

(

const O *

obj

)

const

template<class O , class V >

void HiddenParam< O, V >::removeAndDeleteParam

(

O *

obj

)

template<class O , class V >

void HiddenParam< O, V >::removeParam

(

O *

obj

)

template<class O , class V >

void HiddenParam< O, V >::setParam	(	O *	obj,
		const V &	val
	)

template<class O , class V >

bool HiddenParam< O, V >::setParamIfValueIs	(	O *	obj,
		const V &	curval,
		const V &	newval
	)

Sets value if current value is equal to curval. Otherwise the value is not changed.

Returns

true if value is changed.

Member Data Documentation

template<class O, class V>

Threads::Lock HiddenParam< O, V >::lock_

mutableprotected

template<class O, class V>

ObjectSet<O> HiddenParam< O, V >::objects_

protected

template<class O, class V>

TypeSet<V> HiddenParam< O, V >::params_

protected

template<class O, class V>

V HiddenParam< O, V >::undef_

protected