[CI] Testing the C++20 compilation

CMakeLists.txt

@@ -1,7 +1,7 @@
 cmake_minimum_required (VERSION 3.15.0)
 
 project (KratosMultiphysics)
-set (CMAKE_CXX_STANDARD 17)
+set (CMAKE_CXX_STANDARD 20)
 set (CMAKE_CXX_STANDARD_REQUIRED ON)
 set (CMAKE_CXX_EXTENSIONS OFF)
 

README.md

@@ -16,7 +16,7 @@
 [license-image]: https://img.shields.io/badge/license-BSD-green.svg?style=flat
 [license]: https://github.com/KratosMultiphysics/Kratos/blob/master/kratos/license.txt
 
-[c++-image]: https://img.shields.io/badge/C++-17-blue.svg?style=flat&logo=c%2B%2B
+[c++-image]: https://img.shields.io/badge/C++-20-blue.svg?style=flat&logo=c%2B%2B
 [c++standard]: https://isocpp.org/std/the-standard
 
 [Nightly-Build]: https://github.com/KratosMultiphysics/Kratos/workflows/Nightly%20Build/badge.svg

applications/ChimeraApplication/custom_utilities/hole_cutting_utility.cpp

@@ -55,7 +55,7 @@ void ChimeraHoleCuttingUtility::RemoveOutOfDomainElements(
         for (auto& node : geom) {
             double nodal_distance = node.FastGetSolutionStepValue(CHIMERA_DISTANCE);
 
-            nodal_distance = nodal_distance * DomainType;
+            nodal_distance = nodal_distance * static_cast<double>(DomainType);
             if (nodal_distance < -1 * OverLapDistance) {
                 ++num_nodes_outside;
                 is_elem_outside = is_elem_outside && true;

applications/ConvectionDiffusionApplication/custom_utilities/move_particle_utility.h

@@ -205,7 +205,6 @@ namespace Kratos
 			mvector_of_particle_pointers_vectors.resize(mnelems);
             //int artz;
             //std::cin >> artz;
-			int i_int=0; //careful! it's not the id, but the position inside the array!
 			std::cout << "about to create particles" << std::endl;
 			//now we seed: LOOP IN ELEMENTS
 			//using loop index, DO NOT parallelize this! change lines : mparticles_in_elems_pointers((ii*mmaximum_number_of_particles)+mparticles_in_elems_integers(ii)) = pparticle; and the next one
@@ -230,7 +229,6 @@ namespace Kratos
 
 				Geometry< Node >& geom = ielem->GetGeometry();
 				//unsigned int elem_id = ielem->Id();
-				//mareas_vector[i_int]=CalculateArea(geom); UNUSED SO COMMENTED
 				ComputeGaussPointPositions_initial(geom, pos, N); //we also have the standard (4), and 45
 				//now we seed the particles in the current element
 				for (unsigned int j = 0; j < pos.size1(); j++)
@@ -257,7 +255,6 @@ namespace Kratos
 					 number_of_particles++ ;
 
 				}
-				++i_int;
 			}
 
 			m_nparticles=particle_id; //we save the last particle created as the total number of particles we have. For the moment this is true.
@@ -1173,8 +1170,6 @@ namespace Kratos
 
 			#pragma omp parallel firstprivate(elem_partition) // firstprivate(results)//we will add the nodes in different parts of aux and later assemble everything together, remaming particles ids to get consecutive ids
 			{
-				unsigned int reused_particles=0;
-
 				unsigned int freeparticle = 0; //we start by the first position;
 
 				int k = OpenMPUtils::ThisThread();
@@ -1273,10 +1268,6 @@ namespace Kratos
 							{
 								KRATOS_THROW_ERROR(std::logic_error, "FINISHED THE LIST AND COULDN'T FIND A FREE CELL FOR THE NEW PARTICLE!", "");
 							}
-						    else
-						    {
-								reused_particles++;
-							}
 
 						  }
 					  }

applications/FluidDynamicsApplication/custom_elements/dpg_vms.h

@@ -450,16 +450,17 @@ class DPGVMS : public VMS<TDim, TNumNodes>
 	    ElementBaseType::CalculateLocalVelocityContribution(rDampingMatrix, rRightHandSideVector, rCurrentProcessInfo);
 
 	    //compute boundary term
-	    int boundary_nodes = 0;
+	    // int boundary_nodes = 0;
 	    //unsigned int inside_index = -1;
-	    for (unsigned int i = 0; i < TNumNodes; i++)
-	    {
-	      double nd_flag = this->GetGeometry()[i].FastGetSolutionStepValue(FLAG_VARIABLE);
-	      if (nd_flag == 5.0)
-		boundary_nodes++;
-	      //else
-		//inside_index = i;
-	    }
+
+	    // for (unsigned int i = 0; i < TNumNodes; i++)
+	    // {
+	    //   double nd_flag = this->GetGeometry()[i].FastGetSolutionStepValue(FLAG_VARIABLE);
+	    //   if (nd_flag == 5.0)
+		// boundary_nodes++;
+	    //   //else
+		// //inside_index = i;
+	    // }
 
 
 	/*  if(boundary_nodes == TDim)

applications/LinearSolversApplication/external_libraries/eigen3/COPYING.APACHE

@@ -0,0 +1,203 @@
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