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# openvrml::vrml97_node::abstract_base Class Reference

Inheritance diagram for openvrml::vrml97_node::abstract_base:

[legend]
List of all members.

## Detailed Description

Abstract base class for VRML97 node implementations.

abstract_base encapsulates the mechanisms for field access and mutation, event dispatch, and eventOut access.

## Public Member Functions
virtual | ~abstract_base ()=0 throw ()
| Destroy.
## Protected Member Functions
| abstract_base (const node_type &type, const boost::shared_ptr< openvrml::scope > &scope)
| Construct.
## Private Member Functions
virtual const field_value & | do_field (const std::string &id) const throw (unsupported_interface)
| Get a field value for a node.
virtual openvrml::event_listener & | do_event_listener (const std::string &id) throw (unsupported_interface)
| Get an event listener.
virtual openvrml::event_emitter & | do_event_emitter (const std::string &id) throw (unsupported_interface)
| Get an event emitter.

## Constructor & Destructor Documentation

openvrml::vrml97_node::abstract_base::~abstract_base | ( |  | ) | throw ()`[pure virtual]`

| Destroy.

openvrml::vrml97_node::abstract_base::abstract_base | ( | const node_type & | type,
|  | const boost::shared_ptr< openvrml::scope > & | scope
| ) | `[protected]`

  | Construct. Parameters:
  | type | the node_type associated with this node.
  | scope | the scope to which the node belongs.

## Member Function Documentation

const field_value & openvrml::vrml97_node::abstract_base::do_field | ( | const std::string & | id | ) | const throw (unsupported_interface)`[private, virtual]`

  | Get a field value for a node. Parameters:
  | id | a field name.
  Exceptions:
  | unsupported_interface | if the node has no field `id`.
Implements openvrml::node.

event_listener & openvrml::vrml97_node::abstract_base::do_event_listener | ( | const std::string & | id | ) | throw (unsupported_interface)`[private, virtual]`

  | Get an event listener. This method is called by node::event_listener. Parameters:
  | id | eventIn identifier.
  Returns: the event listener. Exceptions:
  | unsupported_interface | if the node has no eventIn `id`.
Implements openvrml::node.

event_emitter & openvrml::vrml97_node::abstract_base::do_event_emitter | ( | const std::string & | id | ) | throw (unsupported_interface)`[private, virtual]`

  | Get an event emitter. This method is called by node::event_emitter. Parameters:
  | id | eventOut identifier.
  Returns: the event emitter. Exceptions:
  | unsupported_interface | if the node has no eventOut `id`.
Implements openvrml::node.