Properly document the Cell_data in TDS_3 (add concept CellData)

TDS_3/doc/TDS_3/Concepts/CellData.h

@@ -0,0 +1,58 @@
+
+/*!
+\ingroup PkgTDS3Concepts
+
+\cgalConcept
+
+The concept `CellData` describes the requirements on the type which
+is used to mark some cells during modifications of the 3D triangulation data
+structure.
+
+\sa `TriangulationDataStructure_3`
+\sa `TriangulationDSCellBase_3`
+*/
+
+class CellData
+{
+public:
+
+  /*!
+  Clear all data.
+  */
+  void clear();
+
+  /*!
+  Mark the cell as "in conflict".
+  */
+  void mark_in_conflict();
+
+  /*!
+  Mark the cell as "on boundary".
+  */
+  void mark_on_boundary();
+
+  /*!
+  Mark the cell as processed.
+  */
+  void mark_processed();
+
+  /*!
+  Returns `true` if the cell is not marked as "in conflict", "on boundary", or "processed", and `false` otherwise.
+  */
+  void is_clear();
+
+  /*!
+  Returns `true` if the cell is marked as "in conflict", `false` otherwise.
+  */
+  void is_in_conflict();
+
+  /*!
+  Returns `true` if the cell is marked as "on boundary", `false` otherwise.
+  */
+  void is_on_boundary();
+
+  /*!
+  Returns `true` if the cell is marked as processed, `false` otherwise.
+  */
+  bool processed() const;
+};

TDS_3/doc/TDS_3/Concepts/TriangulationDataStructure_3.h

@@ -90,6 +90,11 @@ typedef unspecified_type Vertex;
 */
 typedef unspecified_type Cell;
 
+/*!
+A model of the concept `CellData`.
+*/
+typedef unspecified_type Cell_data;
+
 /*!
 Size type (unsigned integral type) 
 */ 

TDS_3/doc/TDS_3/PackageDescription.txt

@@ -47,7 +47,7 @@ Section  \ref TDS3secintro.)
 \cgalClassifedRefPages
 
 \cgalCRPSection{Concepts}
-
+- `CellData`
 - `TriangulationDataStructure_3`
 - `TriangulationDataStructure_3::Cell`
 - `TriangulationDataStructure_3::Vertex`