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Add an assertion. #16053

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merged 2 commits into from
Sep 28, 2023
Merged

Add an assertion. #16053

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f87a670
Fix a bug where we were choosing the wrong index set.
bangerth Sep 27, 2023
4d1ba2e
Add an assertion.
bangerth Sep 27, 2023
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3 changes: 2 additions & 1 deletion include/deal.II/multigrid/mg_constrained_dofs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -617,7 +617,8 @@ MGConstrainedDoFs::merge_constraints(AffineConstraints<Number> &constraints,
index_set.add_indices(
this->get_user_constraint_matrix(level).get_local_lines());

constraints.reinit(constraints.get_locally_owned_indices(), index_set);
constraints.reinit(level_constraints[level].get_locally_owned_indices(),
index_set);

// merge constraints
if (add_boundary_indices && this->have_boundary_indices())
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7 changes: 7 additions & 0 deletions source/base/index_set.cc
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Expand Up @@ -520,6 +520,13 @@ IndexSet::add_indices(const IndexSet &other, const size_type offset)
bool
IndexSet::is_subset_of(const IndexSet &other) const
{
Assert(size() == other.size(),
ExcMessage("One index set can only be a subset of another if they "
"describe index spaces of the same size. The ones in "
"question here have sizes " +
std::to_string(size()) + " and " +
std::to_string(other.size()) + "."));

// See whether there are indices in the current set that are not in 'other'.
// If so, then this is clearly not a subset of 'other'.
IndexSet A_minus_B = *this;
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