Add explicit <optional> header in Context.h

alebcay · web-flow · commit 9973ccc68a29 · 2021-08-12T19:36:02.000+01:00
Signed-off-by: Caleb Xu &lt;calebcenter@live.com&gt;
diff --git a/include/helib/Context.h b/include/helib/Context.h
@@ -15,6 +15,7 @@
  * @file Context.h
  * @brief Keeps the parameters of an instance of the cryptosystem
  **/
+#include <optional>
 #include <helib/PAlgebra.h>
 #include <helib/CModulus.h>
 #include <helib/IndexSet.h>
