From dc893a8dcffd11171b0e887ce0520e4d64e69ef4 Mon Sep 17 00:00:00 2001
From: Matthias Maier <tamiko@43-1.org>
Date: Mon, 19 Mar 2018 19:29:33 -0500
Subject: [PATCH] Bugfix: Set a value to zero with correct number type
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Otherwise deal.II fails to build with complex-valued PETSc scalar:

.../source/non_matching/coupling.cc:241:29: error: ambiguous overload for ‘operator=’
(operand types are ‘dealii::FullMatrix<std::complex<double> >’ and ‘int’)

                 cell_matrix = 0;
                 ~~~~~~~~~~~~^~~
---
 source/non_matching/coupling.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/source/non_matching/coupling.cc b/source/non_matching/coupling.cc
index 2951c44e56..bd4ae01cc6 100644
--- a/source/non_matching/coupling.cc
+++ b/source/non_matching/coupling.cc
@@ -238,7 +238,7 @@ namespace NonMatching
                 ocell->get_dof_indices(odofs);
 
                 // Reset the matrices.
-                cell_matrix = 0;
+                cell_matrix = typename Matrix::value_type();
 
                 for (unsigned int i=0; i<space_dh.get_fe().dofs_per_cell; ++i)
                   {
-- 
2.39.5