Definition

template<typename Arrangement_>
class CGAL::Arr_vertex_index_map< Arrangement_ >

Arr_vertex_index_map maintains a mapping of vertex handles of an attached arrangement object to indices (of type unsigned int).

This class template is a model of the concept ReadablePropertyMap. A mapping between vertex handles and indices enables convenient usage of property-map classes supplied by boost. For example, the property-map class templates boost::vector_property_map, which is based on std::vector, and boost::iterator_property_map, which can be used to implement a property map based on a native C++ array, require the user to supply a mapping such as Arr_vertex_index_map.

As new vertices might be inserted into the attached arrangement, and existing vertices might be removed, the notification mechanism is used to dynamically maintain the mapping of vertex handles to indices.

Is model of: DefaultConstructible
: CopyConstructible
: Assignable
: ReadablePropertyMap

See also: Arr_face_index_map<Arrangement>

Examples: Arrangement_on_surface_2/bgl_primal_adapter.cpp.

Types
typedef Arrangement_	Arrangement_2
	the type of the attached arrangement.

typedef Arrangement_2::Base_aos	Base_aos

typedef boost::readable_property_map_tag	category

typedef unsigned int	value_type

typedef unsigned int	reference

typedef Vertex_handle	key_type

typedef Base_aos::Vertex_handle	Vertex_handle
	The vertex handle type.

typedef Unique_hash_map< Vertex_handle, value_type >	Index_map
	The type of mapping of vertices to indices.

Creation
	Arr_vertex_index_map ()
	constructs a map that is unattached to any arrangement instance.

	Arr_vertex_index_map (Base_aos &arr)
	constructs a map and attaches it to the given arrangement `arr`.