class ElementFactory

A factory for creating elements based on their type. More...

 
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Detailed Description

Elements are created via their string represented type. They are initialized via a c-style string. If this string is null, then a default value is assigned to the element.

Functions that perform the creation are registered with the factory at run-time.

An exception is throw on element creationg failure.

Similar to Dispatcher.

typedef Element*  (*Callback) (const char*)

(*Callback)

typedef map<string,Callback> Map

Map

 ElementFactory ()

ElementFactory

UnknownElement (class)

UnknownElement

When creating an element of a type which has no registered creation callback with the factory.

void  add (const string& key, Callback cb)

add

Register a callback with the factory.

Parameters:

keythe element id/type. Must be unique.
cbfunction to be called when the element must be created.
Element*  create (const string& key, const char* arg)

create

Create an element.

Parameters:

keythe type of element that needs to be created.
arginitial value of element. If null, a default is assigned.

Returns: the requested element. Caller is responsible for deletion.

bool  can_create (const string& key)

can_create

[static]

Checks whether a type exists.

Parameters:

keythe element to check for.

Returns: true if the element can be create via the factory.


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