openvrml::node_impl_util::ptr_to_polymorphic_mem< MemberBase, Object > Class Template Reference

Abstract base class for a pointer-to-polymorphic-member type. More...

#include <openvrml/node_impl_util.h>

Inheritance diagram for openvrml::node_impl_util::ptr_to_polymorphic_mem< MemberBase, Object >:

Public Member Functions
virtual	~ptr_to_polymorphic_mem ()=0 throw ()
	Destroy. More...
virtual MemberBase &	deref (Object &obj)=0
	Dereference. More...
virtual const MemberBase &	deref (const Object &obj)=0

Detailed Description

template<typename MemberBase, typename Object>
class openvrml::node_impl_util::ptr_to_polymorphic_mem< MemberBase, Object >

Abstract base class for a pointer-to-polymorphic-member type.

In conjunction with ptr_to_polymorphic_mem_impl, this class circumvents the “contravariance problem” with pointer-to-member types. That is, the type Base Object::* is not compatible with the type Derived Object::*.

Template Parameters

MemberBase	the base type of the member.
Object	the type that contains the member.

See also

openvrml::node_impl_util::ptr_to_polymorphic_mem_impl

Constructor & Destructor Documentation

template<typename MemberBase , typename Object >

openvrml::node_impl_util::ptr_to_polymorphic_mem< MemberBase, Object >::~ptr_to_polymorphic_mem ( ) throw ( )

pure virtual

Destroy.

Template Parameters

MemberBase	the base type of the member.
Object	the type that contains the member.

Member Function Documentation

template<typename MemberBase, typename Object>

MemberBase & openvrml::node_impl_util::ptr_to_polymorphic_mem< MemberBase, Object >::deref ( Object &  obj )

pure virtual

Dereference.

Template Parameters

MemberBase	the base type of the member.
Object	the type that contains the member.

Returns

a reference to the base type of the member.

Implemented in openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< MemberBase, Member, Object >, openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< openvrml::event_listener, EventListenerMember, Node >, openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< openvrml::event_emitter, EventEmitterMember, Node >, and openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< openvrml::field_value, FieldMember, Node >.

template<typename MemberBase, typename Object>

const MemberBase & openvrml::node_impl_util::ptr_to_polymorphic_mem< MemberBase, Object >::deref ( const Object &  obj )

pure virtual

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

Template Parameters

MemberBase	the base type of the member.
Object	the type that contains the member.

Returns

a const reference to the base type of the member.

Implemented in openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< MemberBase, Member, Object >, openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< openvrml::event_listener, EventListenerMember, Node >, openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< openvrml::event_emitter, EventEmitterMember, Node >, and openvrml::node_impl_util::ptr_to_polymorphic_mem_impl< openvrml::field_value, FieldMember, Node >.