#2080 Don't allow parameterless Kernel constructor

src/ifcgeom/IfcGeom.h

@@ -299,7 +299,7 @@ private:
 
 public:
 	MAKE_TYPE_NAME(Kernel)()
-		: IfcGeom::Kernel(0)
+		: IfcGeom::Kernel()
 		, deflection_tolerance(0.001)
 		, max_faces_to_orient(-1.0)
 		, ifc_length_unit(1.0)
@@ -321,7 +321,7 @@ public:
 	{}
 
 	MAKE_TYPE_NAME(Kernel)(const MAKE_TYPE_NAME(Kernel)& other)
-		: IfcGeom::Kernel(0)
+		: IfcGeom::Kernel()
 		, deflection_tolerance(other.deflection_tolerance)
 		, max_faces_to_orient(other.max_faces_to_orient)
 		, ifc_length_unit(other.ifc_length_unit)

src/ifcgeom_schema_agnostic/Kernel.h

@@ -42,6 +42,9 @@ namespace IfcGeom {
 	private:
 		Kernel* implementation_;
 
+	protected:
+		Kernel() {};
+
 	public:
 		// Tolerances and settings for various geometrical operations:
 		enum GeomValue {
@@ -80,7 +83,7 @@ namespace IfcGeom {
 			GV_BOOLEAN_ATTEMPT_2D
 		};
 
-		Kernel(IfcParse::IfcFile* file_ = 0);
+		Kernel(IfcParse::IfcFile* file_);
 		
 		virtual ~Kernel() {}