add safeguard

f802d88e · Vaclav Loffelmann · 262a0183 · f802d88e
Commit f802d88e authored Oct 02, 2017 by Vaclav Loffelmann
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SafeQueue.hpp SafeQueue.hpp +3 -1

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--- a/SafeQueue.hpp
+++ b/SafeQueue.hpp
@@ -15,7 +15,9 @@
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
- 
+#ifndef SAFEQUEUE_HPP_
+#define SAFEQUEUE_HPP_
+
 #include <queue>
 #include <list>
 #include <mutex>