plane_index_map is not optional!

update doc + cleaner static assert

BGL/include/CGAL/boost/graph/Named_function_parameters.h

@@ -356,17 +356,24 @@ const T& choose_parameter(const T& t)
   return t;
 }
 
-constexpr bool inline is_default_parameter(const internal_np::Param_not_found&)
+bool inline is_default_parameter(const internal_np::Param_not_found&)
 {
   return true;
 }
 
 template <class T>
-constexpr bool is_default_parameter(const T&)
+bool is_default_parameter(const T&)
 {
   return false;
 }
 
+template <class NP, class TAG>
+constexpr bool is_default_parameter_static()
+{
+  return std::is_same< typename internal_np::Get_param<typename NP::base, TAG>::type,
+                       internal_np::Param_not_found> ::value;
+}
+
 } // end of parameters namespace
 
 #ifndef CGAL_NO_DEPRECATED_CODE

BGL/include/CGAL/boost/graph/named_params_helper.h

@@ -406,7 +406,6 @@ CGAL_DEF_GET_INITIALIZED_INDEX_MAP(face, typename boost::graph_traits<Graph>::fa
     {
       typedef Constant_property_map<std::size_t, int> DummyPlaneIndexMap;
     public:
-      typedef DummyPlaneIndexMap NoMap;
       typedef typename internal_np::Lookup_named_param_def <
         internal_np::plane_index_t,
         NamedParameters,

Point_set_processing_3/include/CGAL/structure_point_set.h

@@ -165,7 +165,7 @@ public:
     \param points input point range
     \param planes input plane range.
     \param epsilon size parameter.
-    \param np an optional sequence of \ref bgl_namedparameters "Named Parameters" among the ones listed below
+    \param np a sequence of \ref bgl_namedparameters "Named Parameters" among the ones listed below:
 
     \cgalNamedParamsBegin
       \cgalParamNBegin{point_map}
@@ -185,7 +185,7 @@ public:
         \cgalParamDescription{a property map associating the index of a point in the input range
                               to the index of plane (`-1` if the point is not assigned to a plane)}
         \cgalParamType{a class model of `ReadablePropertyMap` with `std::size_t` as key type and `int` as value type}
-        \cgalParamDefault{unused}
+        \cgalParamDefault{There is no default, this parameters is mandatory}
       \cgalParamNEnd
 
       \cgalParamNBegin{plane_map}
@@ -204,11 +204,11 @@ public:
   */
   template <typename PointRange,
             typename PlaneRange,
-            typename NamedParameters = parameters::Default_named_parameters>
+            typename NamedParameters>
   Point_set_with_structure (const PointRange& points,
                             const PlaneRange& planes,
                             double epsilon,
-                            const NamedParameters& np = parameters::use_default_values())
+                            const NamedParameters& np)
   {
     init (points, planes, epsilon, np);
   }
@@ -225,6 +225,7 @@ public:
   {
     using parameters::choose_parameter;
     using parameters::get_parameter;
+    using parameters::is_default_parameter_static;
 
     // basic geometric types
     typedef Point_set_processing_3_np_helper<PointRange, NamedParameters> NP_helper;
@@ -234,8 +235,7 @@ public:
     typedef typename Point_set_processing_3::GetPlaneIndexMap<NamedParameters>::type PlaneIndexMap;
 
     CGAL_static_assertion_msg(NP_helper::has_normal_map(), "Error: no normal map");
-    CGAL_static_assertion_msg(!(boost::is_same<PlaneIndexMap,
-                                typename Point_set_processing_3::GetPlaneIndexMap<NamedParameters>::NoMap>::value),
+    CGAL_static_assertion_msg((!is_default_parameter_static<NamedParameters, internal_np::plane_index_t>()),
                               "Error: no plane index map");
 
     PointMap point_map = NP_helper::get_const_point_map(points, np);

Shape_regularization/include/CGAL/Shape_regularization/regularize_planes.h

@@ -292,13 +292,13 @@ namespace Planes {
 
     using parameters::get_parameter;
     using parameters::choose_parameter;
+    using parameters::is_default_parameter_static;
     using PlaneIndexMap = typename CGAL::Point_set_processing_3::
       GetPlaneIndexMap<NamedParameters>::type;
 
-    CGAL_static_assertion_msg(
-      !(boost::is_same<PlaneIndexMap,
-      typename CGAL::Point_set_processing_3::GetPlaneIndexMap<NamedParameters>::NoMap>::value),
-      "Error: no index map found!");
+    CGAL_static_assertion_msg((!is_default_parameter_static<NamedParameters, internal_np::plane_index_t>()),
+                              "Error: no plane index map");
+
     const PlaneIndexMap index_map =
       choose_parameter(get_parameter(np, internal_np::plane_index_map), PlaneIndexMap());
 
@@ -376,9 +376,7 @@ namespace Planes {
     for more details
 
     \param np
-    an optional sequence of \ref bgl_namedparameters "Named Parameters"
-    among the ones listed below; this parameter can be omitted,
-    the default values are then used
+    a sequence of \ref bgl_namedparameters "Named Parameters" among the ones listed below:
 
     \cgalNamedParamsBegin
       \cgalParamNBegin{plane_map}
@@ -396,7 +394,7 @@ namespace Planes {
           in the `points` range to the index of a plane in the `planes` range (-1 if
           point is not assigned to a plane)}
         \cgalParamType{a model of `ReadablePropertyMap` with `std::size_t` as key type and `int` as value type}
-        \cgalParamDefault{`PlaneIndexMap()`}
+        \cgalParamDefault{There is no default, this parameters is mandatory}
       \cgalParamNEnd
       \cgalParamNBegin{maximum_angle}
         \cgalParamDescription{maximum allowed angle in degrees between plane normals used
@@ -440,11 +438,11 @@ namespace Planes {
   template<
   typename PlaneRange,
   typename PointRange,
-  typename NamedParameters = parameters::Default_named_parameters>
+  typename NamedParameters>
   void regularize_planes(
     PlaneRange& planes,
     const PointRange& points,
-    const NamedParameters& np = parameters::use_default_values()) {
+    const NamedParameters& np) {
 
     using parameters::get_parameter;
     using parameters::choose_parameter;