Adapt c++ demos

Author: schnellerhase

cpp/demo/interpolation-io/main.cpp

@@ -66,8 +66,8 @@ void interpolate_scalar(std::shared_ptr<mesh::Mesh<U>> mesh,
 #ifdef HAS_ADIOS2
   // Write the function to a VTX file for visualisation, e.g. using
   // ParaView
-  io::VTXWriter<U> outfile(mesh->comm(), filename.replace_extension("bp"), {u},
-                           "BP4");
+  io::VTXWriter<U> outfile(mesh->comm(), filename.replace_extension("bp"), "w",
+                           {u}, "BP4");
   outfile.write(0);
   outfile.close();
 #endif
@@ -183,7 +183,7 @@ void interpolate_nedelec(std::shared_ptr<mesh::Mesh<U>> mesh,
 // (jump in the normal component between cells) and the x1 component
 // will appear continuous (continuous tangent component between cells).
 #ifdef HAS_ADIOS2
-  io::VTXWriter<U> outfile(mesh->comm(), filename.replace_extension("bp"),
+  io::VTXWriter<U> outfile(mesh->comm(), filename.replace_extension("bp"), "w",
                            {u_l}, "BP4");
   outfile.write(0);
   outfile.close();

cpp/demo/interpolation_different_meshes/main.cpp

@@ -86,9 +86,9 @@ int main(int argc, char* argv[])
     u_hex->interpolate(*u_tet, cells, eps, max_iter, interpolation_data);
 
 #ifdef HAS_ADIOS2
-    io::VTXWriter<double> write_tet(mesh_tet->comm(), "u_tet.bp", {u_tet});
+    io::VTXWriter<double> write_tet(mesh_tet->comm(), "u_tet.bp", "w", {u_tet});
     write_tet.write(0);
-    io::VTXWriter<double> write_hex(mesh_hex->comm(), "u_hex.bp", {u_hex});
+    io::VTXWriter<double> write_hex(mesh_hex->comm(), "u_hex.bp", "w", {u_hex});
     write_hex.write(0);
 #endif
   }

cpp/demo/mixed_poisson/main.cpp

@@ -364,10 +364,10 @@ int main(int argc, char* argv[])
 
 #ifdef HAS_ADIOS2
     // Save solution in VTX format
-    io::VTXWriter<U> vtx_u(MPI_COMM_WORLD, "u.bp", {u_soln}, "bp4");
+    io::VTXWriter<U> vtx_u(MPI_COMM_WORLD, "u.bp", "w", {u_soln}, "bp4");
     vtx_u.write(0);
     // Save interpolated boundary condition
-    io::VTXWriter<U> vtx_u0(MPI_COMM_WORLD, "u0.bp", {u0}, "bp4");
+    io::VTXWriter<U> vtx_u0(MPI_COMM_WORLD, "u0.bp", "w", {u0}, "bp4");
     vtx_u0.write(0);
 #endif
   }

cpp/demo/poisson/main.cpp

@@ -250,7 +250,7 @@ int main(int argc, char* argv[])
 
 #ifdef HAS_ADIOS2
     // Save solution in VTX format
-    io::VTXWriter<U> vtx(MPI_COMM_WORLD, "u.bp", {u}, "bp4");
+    io::VTXWriter<U> vtx(MPI_COMM_WORLD, "u.bp", "w", {u}, "bp4");
     vtx.write(0);
 #endif
   }