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Diffstat (limited to 'src/Simplex_tree/include/gudhi/Simplex_tree/indexing_tag.h')
-rw-r--r--src/Simplex_tree/include/gudhi/Simplex_tree/indexing_tag.h7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/Simplex_tree/include/gudhi/Simplex_tree/indexing_tag.h b/src/Simplex_tree/include/gudhi/Simplex_tree/indexing_tag.h
index 680458a5..69ffa44b 100644
--- a/src/Simplex_tree/include/gudhi/Simplex_tree/indexing_tag.h
+++ b/src/Simplex_tree/include/gudhi/Simplex_tree/indexing_tag.h
@@ -20,6 +20,9 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
+#ifndef SRC_SIMPLEX_TREE_INCLUDE_GUDHI_SIMPLEX_TREE_INDEXING_TAG_H_
+#define SRC_SIMPLEX_TREE_INCLUDE_GUDHI_SIMPLEX_TREE_INDEXING_TAG_H_
+
namespace Gudhi {
/** \brief Tag for a linear ordering of simplices.
@@ -31,4 +34,6 @@ struct linear_indexing_tag {
/* \brief Tag for a zigzag ordering of simplices. */
// struct zigzag_indexing_tag {};
-}// namespace Gudhi
+} // namespace Gudhi
+
+#endif // SRC_SIMPLEX_TREE_INCLUDE_GUDHI_SIMPLEX_TREE_INDEXING_TAG_H_