clipper::PropertyManager Class Reference

Class for holding a list of labelled properties of arbitrary types. More...

#include <clipper_memory.h>

Public Member Functions
	PropertyManager ()
	null constructor
	PropertyManager (const PropertyManager &mgr)
	copy constructor More...
PropertyManager &	operator= (const PropertyManager &mgr)
	assign op More...
	~PropertyManager ()
	destructor More...
PropertyManager &	copy (const PropertyManager &mgr)
	copy manager More...
bool	set_property (const std::string &label, const Property_base &property)
	add a labelled property to the list
const Property_base &	get_property (const std::string &label) const
	get a labelled property from the list More...
bool	exists_property (const std::string &label) const
	test for property More...
bool	delete_property (const std::string &label)
	delete property

Detailed Description

Class for holding a list of labelled properties of arbitrary types.

To add a property list to an object, derive it from this class, or include a member and mirror the methods. To add a property, simply call insert_property(label,property). Properties must be objects derived from clipper::Propert_base. Usually, you can just use the template form, clipper::Property<T>.

To read a property which you know exists and is of a particular type, use:

const T& obj = dynamic_cast<const Property<T>& >(list.get_property( label )).value();

If you are unsure if a property is present, use the exists_property(label) method. If you are unsure of a property's type, dynamic cast a pointer and test for null. e.g.

if ( !list.exists_property( label ) ) { error("No such property"); }
const Property_base* ptr = &list.get_property( label );
if ( dynamic_cast<const T*>(ptr) == NULL )  { error("Wrong type"); }
const T& obj = *(dynamic_cast<const T*>(ptr));

Constructor & Destructor Documentation

clipper::PropertyManager::PropertyManager

(

const PropertyManager &

mgr

)

copy constructor

Makes copies of all property objects.

clipper::PropertyManager::~PropertyManager

(

)

destructor

Deletes all stored properties.

Member Function Documentation

PropertyManager & clipper::PropertyManager::operator=

(

const PropertyManager &

mgr

)

assign op

Clears manager then makes copies of all property objects.

PropertyManager & clipper::PropertyManager::copy

(

const PropertyManager &

mgr

)

copy manager

This function is used by the copy constructor and assignement operator and is also useful for derived classes.

const Property_base & clipper::PropertyManager::get_property

(

const std::string &

label

)

const

get a labelled property from the list

Parameters

label

The label of the property to be returned.

Returns

the property object.

bool clipper::PropertyManager::exists_property

(

const std::string &

label

)

const

test for property

Parameters

label

The label of the property to be tested.

Returns

true on success.

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

• clipper_memory.h
• clipper_memory.cpp