From: Timo Heister Date: Fri, 16 Oct 2020 18:17:56 +0000 (-0400) Subject: improve error message in make_hanging_node_constraints() X-Git-Tag: v9.3.0-rc1~999^2 X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=25fcf3c8d7a4b7847012cffcb57df96e51fdcb16;p=dealii.git improve error message in make_hanging_node_constraints() Without this, it fails with an internal error deep inside the constraints computation. --- diff --git a/source/dofs/dof_tools_constraints.cc b/source/dofs/dof_tools_constraints.cc index ae4f919a88..06bc59730f 100644 --- a/source/dofs/dof_tools_constraints.cc +++ b/source/dofs/dof_tools_constraints.cc @@ -1768,6 +1768,11 @@ namespace DoFTools make_hanging_node_constraints(const DoFHandler &dof_handler, AffineConstraints & constraints) { + Assert(dof_handler.has_active_dofs(), + ExcMessage( + "The given DoFHandler does not have any DoFs. Did you forget to " + "call dof_handler.distribute_dofs()?")); + // Decide whether to use the new or old make_hanging_node_constraints // function. If all the FiniteElement or all elements in a FECollection // support the new face constraint matrix, the new code will be used.