CGAL 6.1 - 3D Triangulation Data Structure

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TriangulationDSVertexBase_3 Concept Reference
Reference Manual » Concepts

## Definition

Refines
  `TriangulationDataStructure_3::Vertex`

The concept TriangulationDSVertexBase_3 describes the requirements for the vertex base class of a CGAL::Triangulation_data_structure_3<Vb,Cb>.

Note that if the `CGAL::Triangulation_data_structure_3` is plugged into a triangulation class, the vertex base class may have additional geometric requirements depending on the triangulation class.

At the bottom level of 3D-triangulations (see Sections Software Design and Software Design), a vertex provides access to one of its incident cells through a handle.

Since the Triangulation data structure is the class which defines the handle types, the vertex base class has to be somehow parameterized by the Triangulation data structure. But since it is itself parameterized by the cell and vertex base classes, there is a cycle in the definition of these classes. In order to break the cycle, the base classes for vertex and cell which are given as arguments for the Triangulation data structure use `void` as Triangulation data structure parameter, and the Triangulation data structure then uses a rebind-like mechanism (similar to the one specified in `std::allocator`) in order to put itself as parameter to the vertex and cell classes. The rebound base classes so obtained are the classes which are used as base classes for the final vertex and cell classes. More information can be found in Section Software Design.

Has models
  `CGAL::Triangulation_ds_vertex_base_3<TDS>`

See also
  `TriangulationDSCellBase_3`
  `CGAL::Triangulation_data_structure_3<Vb,Cb>`

## Types
template<typename TDS3 >
using | Rebind_TDS = unspecified_type
| This template class has to define a type `Rebind_TDS<TDS3>::Other` which is the rebound vertex, that is, the one whose `Triangulation_data_structure` will be the actually used one.
typedef TriangulationDataStructure_3 | Triangulation_data_structure
typedef TriangulationDataStructure_3::Vertex_handle | Vertex_handle
typedef TriangulationDataStructure_3::Cell_handle | Cell_handle

## Creation
| TriangulationDSVertexBase_3 ()
| Default constructor.
| TriangulationDSVertexBase_3 (Cell_handle c)
| Constructs a vertex pointing to cell `c`.

## Checking
bool | is_valid (bool verbose=false, int level=0) const
| This is a function for debugging purpose.

## Members for Compact_container
Advanced These member functions are required by `CGAL::Triangulation_data_structure_3` because it uses `CGAL::Compact_container` to store its cells. See the documentation of `CGAL::Compact_container` for the exact requirements.
void * | for_compact_container () const
void | for_compact_container (void *)
istream & | operator>> (istream &is, TriangulationDSVertexBase_3 &v)
| Inputs the non-combinatorial information given by the vertex.
ostream & | operator<< (ostream &os, const TriangulationDSVertexBase_3 &v)
| Outputs the non-combinatorial information given by the vertex.

## Member Typedef Documentation

## ◆ Rebind_TDS

template<typename TDS3 >

using TriangulationDSVertexBase_3::Rebind_TDS = unspecified_type

This template class has to define a type `Rebind_TDS<TDS3>::Other` which is the rebound vertex, that is, the one whose `Triangulation_data_structure` will be the actually used one.

`Rebind_TDS<TDS3>::Other` will be the real base class of `Triangulation_data_structure_3::Vertex`.

Note
  It can be implemented using a nested template class.

See also
  Section Cyclic Dependency

## Member Function Documentation

## ◆ is_valid()

bool TriangulationDSVertexBase_3::is_valid | ( | bool | verbose = `false`,
|  | int | level = `0`
| ) |  | const

This is a function for debugging purpose.

Debugging Support

Performs any desired test on a vertex. Checks that the pointer to an incident cell is not the default constructed handle.